Copyright

Preface

Effective Use of the International Residential Code

Part I ‒ Administration

Chapter 1 Administration

Part II ‒ Definitions

Chapter 2 Definitions

Part III ‒ Building Planning and Construction

Chapter 3 Building Planning

Chapter 4 Foundations

Chapter 5 Floors

Chapter 6 Wall Construction

Chapter 7 Wall Covering

Chapter 8 Roof-Ceiling Construction

Chapter 9 Roof Assemblies

Chapter 10 Chimneys and Fireplaces

Part IV ‒ Energy Conservation

Chapter 11 Energy Efficiency

Part V ‒ Mechanical

Chapter 12 Mechanical Administration

Chapter 13 General Mechanical System Requirements

Chapter 14 Heating and Cooling Equipment

Chapter 15 Exhaust Systems

Chapter 16 Duct Systems

Chapter 17 Combustion Air

Chapter 18 Chimneys and Vents

Chapter 19 Special Fuel-Burning Equipment

Chapter 20 Boilers and Water Heaters

Chapter 21 Hydronic Piping

Chapter 22 Special Piping and Storage Systems

Chapter 23 Solar Systems

Part VI ‒ Fuel Gas

Chapter 24 Fuel Gas

Part VII ‒ Plumbing

Chapter 25 Plumbing Systems

Chapter 26 — 28

Chapter 29 Water Supply and Distribution

Chapter 30 — 33

Chapter 34 General Requirements

Chapter 35 — 43

Part IX ‒ Referenced Standards

Chapter 44 Referenced Standards

The provisions of this chapter shall control the design and construction of the roof-ceiling system for all buildings.
Roof and ceiling construction shall be capable of accommodating all loads imposed according to Section 301 and of transmitting the resulting loads to the supporting structural elements.

In areas where expansive or collapsible soils are known to exist, all dwellings shall have a controlled method of water disposal from roofs that will collect and discharge roof drainage to the ground surface at least 5 feet (1524 mm) from foundation walls or to an approved drainage system.

Exception: The minimum distance shall not apply when the discharge occurs on the exterior side of walls where the building official determines such drainage will not be detrimental to the building performance.
Load-bearing dimension lumber for rafters, trusses and ceiling joists shall be identified by a grade mark of a lumber grading or inspection agency that has been approved by an accreditation body that complies with DOC PS 20. In lieu of a grade mark, a certificate of inspection issued by a lumber grading or inspection agency meeting the requirements of this section shall be accepted.
Blocking shall be a minimum of utility grade lumber.
Approved end-jointed lumber identified by a grade mark conforming to Section 802.1 may be used interchangeably with solid-sawn members of the same species and grade.
Fire-retardant-treated wood (FRTW) is any wood product which, when impregnated with chemicals by a pressure process or other means during manufacture, shall have, when tested in accordance with ASTM E 84, a listed flame spread index of 25 or less and shows no evidence of significant progressive combustion when the test is continued for an additional 20-minute period. In addition, the flame front shall not progress more than 10.5 feet (3200 mm) beyond the center line of the burners at any time during the test.
For wood products impregnated with chemicals by a pressure process, the process shall be performed in closed vessels under pressures not less than 50 pounds per square inch gauge (psig) (344.7 kPa).
For wood products produced by other means during manufacture the treatment shall be an integral part of the manufacturing process of the wood product. The treatment shall provide permanent protection to all surfaces of the wood product.
For wood products produced by other means during manufacture, other than a pressure process, all sides of the wood product shall be tested in accordance with and produce the results required in Section 802.1.3. Testing of only the front and back faces of wood structural panels shall be permitted.

Fire-retardant-treated lumber and wood structural panels shall be labeled. The label shall contain:

1. The identification mark of an approved agency in accordance with Section 1703.5 of the “Ohio Building Code.

2. Identification of the treating manufacturer.

3. The name of the fire-retardant treatment.

4. The species of wood treated.

5. Flame spread index and smoke-developed index.

6. Method of drying after treatment.

7. Conformance to applicable standards in accordance with Sections 802.1.3.5 through 802.1.3.8.

8. For FRTW exposed to weather, or a damp or wet location, the words “No increase in the listed classification when subjected to the Standard Rain Test” (ASTM D 2898).

Design values for untreated lumber and wood structural panels as specified in Section 802.1 shall be adjusted for fire-retardant-treated wood. Adjustments to design values shall be based upon an approved method of investigation which takes into consideration the effects of the anticipated temperature and humidity to which the fire-retardant-treated wood will be subjected, the type of treatment and redrying procedures.
The effect of treatment and the method of redrying after treatment, and exposure to high temperatures and high humidities on the flexure properties of fire-retardant-treated softwood plywood shall be determined in accordance with ASTM D 5516. The test data developed by ASTM D 5516 shall be used to develop adjustment factors, maximum loads and spans, or both for untreated plywood design values in accordance with ASTM D 6305. Each manufacturer shall publish the allowable maximum loads and spans for service as floor and roof sheathing for their treatment.
For each species of wood treated, the effect of the treatment and the method of redrying after treatment and exposure to high temperatures and high humidities on the allowable design properties of fire-retardant-treated lumber shall be determined in accordance with ASTM D 5664. The test data developed by ASTM D 5664 shall be used to develop modification factors for use at or near room temperature and at elevated temperatures and humidity in accordance with ASTM D 6841. Each manufacturer shall publish the modification factors for service at temperatures of not less than 80°F (27°C) and for roof framing. The roof framing modification factors shall take into consideration the climatological location.
Where fire-retardant-treated wood is exposed to weather or damp or wet locations, it shall be identified as “Exterior” to indicate there is no increase in the listed flame spread index as defined in Section 802.1.3 when subjected to ASTM D 2898.
Interior fire-retardant-treated wood shall have a moisture content of not over 28 percent when tested in accordance with ASTM D 3201 procedures at 92 percent relative humidity. Interior fire-retardant-treated wood shall be tested in accordance with Section 802.1.3.5.1 or 802.1.3.5.2. Interior fire-retardant-treated wood designated as Type A shall be tested in accordance with the provisions of this section.
Fire-retardant-treated wood shall be dried to a moisture content of 19 percent or less for lumber and 15 percent or less for wood structural panels before use. For wood kiln dried after treatment (KDAT) the kiln temperatures shall not exceed those used in kiln drying the lumber and plywood submitted for the tests described in Section 802.1.3.5.1 for plywood and 802.1.3.5.2 for lumber.
Glued laminated timbers shall be manufactured and identified as required in ANSI/AITC A190.1 and ASTM D 3737.
Stress grading of structural log members of nonrectangular shape, as typically used in log buildings, shall be in accordance with ASTM D 3957. Such structural log members shall be identified by the grade mark of an approved lumber grading or inspection agency. In lieu of a grade mark on the material, a certificate of inspection as to species and grade issued by a lumber-grading or inspection agency meeting the requirements of this section shall be permitted to be accepted.
The framing details required in Section 802 apply to roofs having a minimum slope of three units vertical in 12 units horizontal (25-percent slope) or greater. Roof-ceilings shall be designed and constructed in accordance with the provisions of this chapter and Figures 606.11(1), 606.11(2) and 606.11(3) or in accordance with AFPA/NDS. Components of roof-ceilings shall be fastened in accordance with Table 602.3(1).
Rafters shall be framed to ridge board or to each other with a gusset plate as a tie. Ridge board shall be at least 1-inch (25 mm) nominal thickness and not less in depth than the cut end of the rafter. At all valleys and hips there shall be a valley or hip rafter not less than 2-inch (51 mm) nominal thickness and not less in depth than the cut end of the rafter. Hip and valley rafters shall be supported at the ridge by a brace to a bearing partition or be designed to carry and distribute the specific load at that point. Where the roof pitch is less than three units vertical in 12 units horizontal (25-percent slope), structural members that support rafters and ceiling joists, such as ridge beams, hips and valleys, shall be designed as beams.

Ceiling joists and rafters shall be nailed to each other in accordance with Table 802.5.1(9), and the rafter shall be nailed to the top wall plate in accordance with Table 602.3(1). Ceiling joists shall be continuous or securely joined in accordance with Table 802.5.1(9) where they meet over interior partitions and are nailed to adjacent rafters to provide a continuous tie across the building when such joists are parallel to the rafters.

Where ceiling joists are not connected to the rafters at the top wall plate, joists connected higher in the attic shall be installed as rafter ties, or rafter ties shall be installed to provide a continuous tie. Where ceiling joists are not parallel to rafters, rafter ties shall be installed. Rafter ties shall be a minimum of 2-inch by 4-inch (51 mm by 102 mm) (nominal), installed in accordance with the connection requirements in Table 802.5.1(9), or connections of equivalent capacities shall be provided. Where ceiling joists or rafter ties are not provided, the ridge formed by these rafters shall be supported by a wall or girder designed in accordance with accepted engineering practice.
Collar ties or ridge straps to resist wind uplift shall be connected in the upper third of the attic space in accordance with Table 602.3(1).
Collar ties shall be a minimum of 1-inch by 4-inch (25 mm by 102 mm) (nominal), spaced not more than 4 feet (1219 mm) on center.
Ends of ceiling joists shall be lapped a minimum of 3 inches (76 mm) or butted over bearing partitions or beams and toenailed to the bearing member. When ceiling joists are used to provide resistance to rafter thrust, lapped joists shall be nailed together in accordance with Table 602.3(1) and butted joists shall be tied together in a manner to resist such thrust.

Spans for ceiling joists shall be in accordance with Tables 802.4(1) and 802.4(2). For other gradesand species and for other loading conditions, refer to the AF&PA Span Tables for Joists and Rafters.

TABLE 802.4(1)
CEILING JOIST SPANS FOR COMMON LUMBER SPECIES
(Uninhabitable attics without storage, live load = 10 psf, L/Δ = 240)

CEILING JOIST
SPACING
(inches)
SPECIES AND GRADEDEAD LOAD = 5 psf
2 × 42 × 62 × 82 × 10
Maximum ceiling joist spans
(feet - inches)(feet - inches)(feet - inches)(feet - inches)
12Douglas fir-larchSS13-220-8Note aNote a
Douglas fir-larch#112-819-11Note aNote a
Douglas fir-larch#212-519-625-8Note a
Douglas fir-larch#310-1015-1020-124-6
Hem-firSS12-519-625-8Note a
Hem-fir#112-219-125-2Note a
Hem-fir#211-718-224-0Note a
Hem-fir#310-1015-1020-124-6
Southern pineSS12-1120-3Note aNote a
Southern pine#112-819-11Note aNote a
Southern pine#212-519-625-8Note a
Southern pine#311-617-021-825-7
Spruce-pine-firSS12-219-125-2Note a
Spruce-pine-fir#111-1018-824-7Note a
Spruce-pine-fir#211-1018-824-7Note a
Spruce-pine-fir#310-1015-1020-124-6
16Douglas fir-larchSS11-1118-924-8Note a
Douglas fir-larch#111-618-123-10Note a
Douglas fir-larch#211-317-823-0Note a
Douglas fir-larch#39-513-917-521-3
Hem-firSS11-317-823-4Note a
Hem-fir#111-017-422-10Note a
Hem-fir#210-616-621-9Note a
Hem-fir#39-513-917-521-3
Southern pineSS11-918-524-3Note a
Southern pine#111-618-123-1Note a
Southern pine#211-317-823-4Note a
Southern pine#310-014-918-922-2
Spruce-pine-firSS11-017-422-10Note a
Spruce-pine-fir#110-916-1122-4Note a
Spruce-pine-fir#210-916-1122-4Note a
Spruce-pine-fir#39-513-917-521-3
19.2Douglas fir-larchSS11-317-823-3Note a
Douglas fir-larch#110-1017-022-5Note a
Douglas fir-larch#210-716-721-025-8
Douglas fir-larch#38-712-615-1019-5
Hem-firSS10-716-821-11Note a
Hem-fir#110-416-421-6Note a
Hem-fir#29-1115-720-625-3
Hem-fir#38-712-615-1019-5
Southern -pineSS11-017-422-10Note a
Southern pine#110-1017-022-5Note a
Southern pine#210-716-821-11Note a
Southern pine#39-113-617-220-3
Spruce-pine-firSS10-416-421-6Note a
Spruce-pine-fir#110-215-1121-025-8
Spruce-pine-fir#210-215-1121-025-8
Spruce-pine-fir#38-712-615-1019-5

(continued)

TABLE 802.4(1)—continued
CEILING JOIST SPANS FOR COMMON LUMBER SPECIES
(Uninhabitable attics without storage, live load = 10 psf, L/Δ = 240)

CEILING JOIST
SPACING (inches)
SPECIES AND GRADEDEAD LOAD = 5 psf
2 × 42 × 62 × 82 × 10
Maximum ceiling joist spans
(feet - inches)(feet - inches)(feet - inches)(feet - inches)
24Douglas fir-larchSS10-516-421-7Note a
Douglas fir-larch#110-015-920-124-6
Douglas fir-larch#29-1014-1018-922-11
Douglas fir-larch#37-811-214-217-4
Hem-firSS9-1015-620-5Note a
Hem-fir#19-815-219-723-11
Hem-fir#29-214-518-622-7
Hem-fir#37-811-214-217-4
Southern pineSS10-316-121-2Note a
Southern pine#110-015-920-10Note a
Southern pine#29-1015-620-123-11
Southern pine#38-212-015-418-1
Spruce-pine-firSS9-815-219-1125-5
Spruce-pine-fir#19-514-918-922-11
Spruce-pine-fir#29-514-918-922-11
Spruce-pine-fir#37-811-214-217-4
Check sources for availability of lumber in lengths greater than 20 feet.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479kPa.
a. Span exceeds 26 feet in length.

TABLE 802.4(2)
CEILING JOIST SPANS FOR COMMON LUMBER SPECIES
(Uninhabitable attics with limited storage, live load = 20 psf, L/Δ = 240)

CEILING JOIST
SPACING
(inches)
SPECIES AND GRADEDEAD LOAD = 10 psf
2 × 42 × 62 × 82 × 10
Maximum ceiling joist spans
(feet - inches)(feet - inches)(feet - inches)(feet - inches)
12Douglas fir-larchSS10-516-421-7Note a
Douglas fir-larch#110-015-920-124-6
Douglas fir-larch#29-1014-1018-922-11
Douglas fir-larch#37-811-214-217-4
Hem-firSS9-1015-620-5Note a
Hem-fir#19-815-219-723-11
Hem-fir#29-214-518-622-7
Hem-fir#37-811-214-217-4
Southern pineSS10-316-121-2Note a
Southern pine#110-015-920-10Note a
Southern pine#29-1015-620-123-11
Southern pine#38-212-015-418-1
Spruce-pine-firSS9-815-219-1125-5
Spruce-pine-fir#19-514-918-922-11
Spruce-pine-fir#29-514-918-922-11
Spruce-pine-fir#37-811-214-217-4
16Douglas fir-larchSS9-614-1119-725-0
Douglas fir-larch#19-113-917-521-3
Douglas fir-larch#28-912-1016-319-10
Douglas fir-larch#36-89-812-415-0
Hem-firSS8-1114-118-623-8
Hem-fir#18-913-516-1020-8
Hem-fir#28-412-816-019-7
Hem-fir#36-89-812-415-0
Southern pineSS9-414-719-324-7
Southern pine#19-114-418-1123-1
Southern pine#28-1113-617-520-9
Southern pine#37-110-513-315-8
Spruce-pine-firSS8-913-918-123-1
Spruce-pine-fir#18-712-1016-319-10
Spruce-pine-fir#28-712-1016-319-10
Spruce-pine-fir#36-89-812-415-0
19.2Douglas fir-larchSS8-1114-018-523-4
Douglas fir-larch#18-712-615-1019-5
Douglas fir-larch#28-011-914-1018-2
Douglas fir-larch#36-18-1011-313-8
Hem-firSS8-513-317-522-3
Hem-fir#18-312-315-618-11
Hem-fir#27-1011-714-817-10
Hem-fir#36-18-1011-313-8
Southern pineSS8-913-918-123-1
Southern pine#18-713-617-921-1
Southern pine#28-512-315-1018-11
Southern pine#36-59-612-114-4
Spruce-pine-firSS8-312-1117-121-8
Spruce-pine-fir#18-011-914-1018-2
Spruce-pine-fir#28-011-914-1018-2
Spruce-pine-fir#36-18-1011-313-8

(continued)

TABLE 802.4(2)—continued
CEILING JOIST SPANS FOR COMMON LUMBER SPECIES
(Uninhabitable attics with limited storage, live load = 20 psf, L/Δ = 240)

CEILING JOIST
SPACING
(inches)
SPECIES AND GRADEDEAD LOAD = 10 psf
2 × 42 × 62 × 82 × 10
Maximum ceiling joist spans
(feet - inches)(feet - inches)(feet - inches)(feet - inches)
24Douglas fir-larchSS8-313-017-120-11
Douglas fir-larch#17-811-214-217-4
Douglas fir-larch#27-210-613-316-3
Douglas fir-larch#35-57-1110-012-3
Hem-firSS7-1012-316-220-6
Hem-fir#17-610-1113-1016-11
Hem-fir#27-110-413-116-0
Hem-fir#35-57-1110-012-3
Southern pineSS8-112-916-1021-6
Southern pine#18-012-615-1018-10
Southern pine#27-811-014-216-11
Southern pine#35-98-610-1012-10
Spruce-pine-firSS7-812-015-1019-5
Spruce-pine-fir#17-210-613-316-3
Spruce-pine-fir#27-210-613-316-3
Spruce-pine-fir#35-57-1110-012-3
Check sources for availability of lumber in lengths greater than 20 feet.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479kPa.
a. Span exceeds 26 feet in length.
Spans for rafters shall be in accordance with Tables 802.5.1(1) through 802.5.1(8). For other gradesand species and for other loading conditions, refer to the AF&PA Span Tables for Joists and Rafters. The span of each rafter shall be measured along the horizontal projection of the rafter.

Installation of purlins to reduce the span of rafters is permitted as shown in Figure 802.5.1. Purlins shall be sized no less than the required size of the rafters that they support. Purlins shall be continuous and shall be supported by 2-inch by 4-inch (51 mm by 102 mm) braces installed to bearing walls at a slope not less than 45 degrees from the horizontal. The braces shall be spaced not more than 4 feet (1219 mm) on center and the unbraced length of braces shall not exceed 8 feet (2438 mm).

TABLE 802.5.1(1)
RAFTER SPANS FOR COMMON LUMBER SPECIES
(Roof live load=20 psf, ceiling not attached to rafters, L/Δ = 180)

RAFTER
SPACING
(inches)
SPECIES AND GRADEDEAD LOAD = 10 psfDEAD LOAD = 20 psf
2 × 42 × 62 × 82 × 102 × 122 × 42 × 62 × 82 × 102 × 12
Maximum rafter spansa
(feet -
inches)
(feet -
inches)
(feet -
inches)
(feet -
inches)
(feet -
inches)
(feet -
inches)
(feet -
inches)
(feet -
inches)
(feet -
inches)
(feet -
inches)
12Douglas fir-larchSS11-618-023-9Note bNote b11-618-023-5Note bNote b
Douglas fir-larch#111-117-422-5Note bNote b10-615-419-523-9Note b
Douglas fir-larch#210-1016-721-025-8Note b9-1014-418-222-325-9
Douglas fir-larch#38-712-615-1019-522-67-510-1013-916-919-6
Hem-firSS10-1017-022-5Note bNote b10-1017-022-5Note bNote b
Hem-fir#110 -716-821-10Note bNote b10-314-1118-1123-2Note b
Hem-fir#210-115-1120-825-3Note b9-814-217-1121-1125-5
Hem-fir#38-712-615-1019-522-67-510-1013-916-919-6
Southern pineSS11-317-823-4Note bNote b11-317-823-4Note bNote b
Southern pine#111-117-422-11Note bNote b11-117-321-925-10Note b
Southern pine#210-1017-022-5Note bNote b10-615-119-523-2Note b
Southern pine#39-113-617-220-324-17-1111-814-1017-620-11
Spruce-pine-firSS10-716-821-11Note bNote b10-716-821-9Note bNote b
Spruce-pine-fir#110-416-321-025-8Note b9-1014-418-222-325-9
Spruce-pine-fir#210-416-321-025-8Note b9-1014-418-222-325-9
Spruce-pine-fir#38-712-615-1019-522-67-510-1013-916-919-6
16Douglas fir-larchSS10-516-421-7Note bNote b10-516-020-324-9Note b
Douglas fir-larch#110-015-419-523-9Note b9-113-316-1020-723-10
Douglas fir-larch#29-1014-418-222-325-98-612-515-919-322-4
Douglas fir-larch#37-510-1013-916-919-66-59-511-1114-616-10
Hem-firSS9-1015-620-5Note bNote b9-1015-619-1124-4Note b
Hem-fir#19-814-1118-1123-2Note b8-1012-1116-520-023-3
Hem-fir#29-214-217-1121-1125-58-512-315-618-1122-0
Hem-fir#37-510-1013-916-919-66-59-511-1114-616-10
Southern pineSS10-316-121-2Note bNote b10-316-121-2Note bNote b
Southern pine#110-015-920-1025-10Note b10-015-018-1022-4Note b
Southern pine#29-1015-119-523-2Note b9-113-016-1020-123-7
Southern pine#37-1111-814-1017-620-116-1010-112-1015-218-1
Spruce-pine-firSS9-815-219-1125-5Note b9-814-1018-1023-0Note b
Spruce-pine-fir#19-514-418-222-325-98-612-515-919-322-4
Spruce-pine-fir#29-514-418-222-325-98-612-515-919-322-4
Spruce-pine-fir#37-510-1013-916-919-66-59-511-1114-616-10
19.2Douglas fir-larchSS9-1015-520-425-11Note b9-1014-718-622-7Note b
Douglas fir-larch#19-514-017-921-825-28-412-215-418-921-9
Douglas fir-larch#28-1113-116-720-323-67-911-414-417-720-4
Douglas fir-larch#36-99-1112-715-417-95-108-710-1013-315-5
Hem-firSS9-314-719-224-6Note b9-314-418-222-325-9
Hem-fir#19-113-817-421-124-68-111-1015-018-421-3
Hem-fir#28-812-1116-420-023-27-811-214-217-420-1
Hem-fir#36-99-1112-715-417-95-108-710-1013-315-5
Southern pineSS9-815-219-1125-5Note b9-815-219-1125-5Note b
Southern pine#19-514-1019-723-7Note b9-313-817-220-524-4
Southern pine#29-313-917-921-224-108-411-1115-418-421-6
Southern pine#37-310-813-716-019-16-39-311-913-1016-6
Spruce-pine-firSS9-114-318-923-11Note b9-113-717-221-024-4
Spruce-pine-fir#18-1013-116-720-323-67-911-414-417-720-4
Spruce-pine-fir#28-1013-116-720-323-67-911-414-417-720-4
Spruce-pine-fir#36-99-1112-715-417-95-108-710-1013-315-5

(continued)

TABLE 802.5.1(1)—continued
RAFTER SPANS FOR COMMON LUMBER SPECIES
(Roof live load=20 psf, ceiling not attached to rafters, L/Δ = 180)

RAFTER SPACING (inches)SPECIES AND GRADEDEAD LOAD = 10 psfDEAD LOAD = 20 psf
2 × 42 × 62 × 82 × 102 × 122 × 42 × 62 × 82 × 102 × 12
Maximum rafter spansa
(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)
24Douglas fir-larchSS9-114-418-1023-4Note b8-1113-116-720-323-5
Douglas fir-larch#18-712-615-1019-522-67-510-1013-916-919-6
Douglas fir-larch#28-011-914-1018-221-06-1110-212-1015-818-3
Douglas fir-larch#36-18-1011-313-815-115-37-89-911-1013-9
Hem-firSS8-713-617-1022-9Note b8-712-1016-319-1023-0
Hem-fir#18-412-315-618-1121-117-310-713-516-419-0
Hem-fir#27-1111-714-817-1020-96-1010-012-815-617-11
Hem-fir#36-18-1011-313-815-115-37-89-911-1013-9
Southern pineSS8-1114-118-623-8Note b8-1114-118-622-11Note b
Southern pine#18-913-917-921-125-28-312-315-418-321-9
Southern pine#28-712-315-1018-1122-27-510-813-916-519-3
Southern pine#36-59-612-114-417-15-78-310-612-514-9
Spruce-pine-firSS8-513-317-521-825-28-412-215-418-921-9
Spruce-pine-fir#18-011-914-1018-221-06-1110-212-1015-818-3
Spruce-pine-fir#28-011-914-1018-221-06-1110-212-1015-818-3
Spruce-pine-fir#36-18-1011-313-815-115-37-89-911-1013-9
Check sources for availability of lumber in lengths greater than 20 feet.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479kPa.
a. The tabulated rafter spans assume that ceiling joists are located at the bottom of the attic space or that some other method of resisting the outward push of the rafters on the bearing walls, such as rafter ties, is provided at that location. When ceiling joists or rafter ties are located higher in the attic space, the rafter spans shall be multiplied by the factors given below:
HC/HRRafter Span Adjustment Factor
1/30.67
1/40.76
1/50.83
1/60.90
1/7.5 or less1.00

where:

HC
=
Height of ceiling joists or rafter ties measured vertically above the top of the rafter support walls.
HR
=
Height of roof ridge measured vertically above the top of the rafter support walls.
b. Span exceeds 26 feet in length.

TABLE 802.5.1(2)
RAFTER SPANS FOR COMMON LUMBER SPECIES
(Roof live load=20 psf, ceiling attached to rafters, L/Δ = 240)

RAFTER SPACING (inches)SPECIES AND GRADEDEAD LOAD = 10 psfDEAD LOAD = 20 psf
2 × 42 × 62 × 82 × 102 × 122 × 42 × 62 × 82 × 102 × 12
Maximum rafter spansa
(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)
12Douglas fir-larchSS10-516-421-7Note bNote b10-516-421-7Note bNote b
Douglas fir-larch#110-015-920-10Note bNote b10-015-419-523-9Note b
Douglas fir-larch#29-1015-620-525-8Note b9-1014-418-222-325-9
Douglas fir-larch#38-712-615-1019-522-67-510-1013-916-919-6
Hem-firSS9-1015-620-5Note bNote b9-1015-620-5Note bNote b
Hem-fir#19-815-219-1125-5Note b9-814-1118-1123-2Note b
Hem-fir#29-214-519-024-3Note b9-214-217-1121-1125-5
Hem-fir#38-712-615-1019-522-67-510-1013-916-919-6
Southern pineSS10-316-121-2Note bNote b10-316-121-2Note bNote b
Southern pine#110-015-920-10Note bNote b10-015-920-1025-10Note b
Southern pine#29-1015-620-5Note bNote b9-1015-119-523-2Note b
Southern pine#39-113-617-220-324-17-1111-814-1017-620-11
Spruce-pine-firSS9-815-219-1125-5Note b9-815-219-1125-5Note b
Spruce-pine-fir#19-514-919-624-10Note b9-514-418-222-325-9
Spruce-pine-fir#29-514-919-624-10Note b9-514-418-222-325-9
Spruce-pine-fir#38-712-615-1019-522-67-510-1013-916-919-6
16Douglas fir-larchSS9-614-1119-725-0Note b9-614-1119-724-9Note b
Douglas fir-larch#19-114-418-1123-9Note b9-113-316-1020-723-10
Douglas fir-larch#28-1114-118-222-325-98-612-515-919-322-4
Douglas fir-larch#37-510-1013-916-919-66-59-511-1114-616-10
Hem-firSS8-1114-118-623-8Note b8-1114-118-623-8Note b
Hem-fir#18-913-918-123-1Note b8-912-1116-520-023-3
Hem-fir#28-413-117-321-1125-58-412-315-618-1122-0
Hem-fir#37-510-1013-916-919-66-59-511-1114-616-10
Southern pineSS9-414-719-324-7Note b9-414-719-324-7Note b
Southern pine#19-114-418-1124-1Note b9-114-418-1022-4Note b
Southern pine#28-1114-118-623-2Note b8-1113-016-1020-123-7
Southern pine#37-1111-814-1017-620-116-1010-112-1015-218-1
Spruce-pine-firSS8-913-918-123-1Note b8-913-918-123-0Note b
Spruce-pine-fir#18-713-517-922-325-98-612-515-919-322-4
Spruce-pine-fir#28-713-517-922-325-98-612-515-919-322-4
Spruce-pine-fir#37-510-1013-916-919-66-59-511-1114-616-10
19.2Douglas fir-larchSS8-1114-018-523-7Note b8-1114-018-522-7Note b
Douglas fir-larch#18-713-617-921-825-28-412-215-418-921-9
Douglas fir-larch#28-513-116-720-323-67-911-414-417-720-4
Douglas fir-larch#36-99-1112-715-417-95-108-710-1013-315-5
Hem-firSS8-513-317-522-3Note b8-513-317-522-325-9
Hem-fir#18-312-1117-121-124-68-111-1015-018-421-3
Hem-fir#27-1012-416-320-023-27-811-214-217-420-1
Hem-fir#36-99-1112-715-417-95-108-710-1013-315-5
Southern pineSS8-913-918-123-1Note b8-913-918-123-1Note b
Southern pine#18-713-617-922-8Note b8-713-617-220-524-4
Southern pine#28-513-317-521-224-108-411-1115-418-421-6
Southern pine#37-310-813-716-019-16-39-311-913-1016-6
Spruce-pine-firSS8-312-1117-121-9Note b8-312-1117-121-024-4
Spruce-pine-fir#18-112-816-720-323-67-911-414-417-720-4
Spruce-pine-fir#28-112-816-720-323-67-911-414-417-720-4
Spruce-pine-fir#36-99-1112-715-417-95-108-710-1013-315-5

(continued)

TABLE 802.5.1(2)—continued
RAFTER SPANS FOR COMMON LUMBER SPECIES
(Roof live load=20 psf, ceiling attached to rafters, L/Δ = 240)

RAFTER SPACING (inches)SPECIES AND GRADEDEAD LOAD = 10 psfDEAD LOAD = 20 psf
2 × 42 × 62 × 82 × 102 × 122 × 42 × 62 × 82 × 102 × 12
Maximum rafter spansa
(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)
24Douglas fir-larchSS8-313-017-221-10Note b8-313-016-720-323-5
Douglas fir-larch#18-012-615-1019-522-67-510-1013-916-919-6
Douglas fir-larch#27-1011-914-1018-221-06-1110-212-1015-818-3
Douglas fir-larch#36-18-1011-313-815-115-37-89-911-1013-9
Hem-firSS7-1012-316-220-825-17-1012-316-219-1023-0
Hem-fir#17-812-015-618-1121-117-310-713-516-419-0
Hem-fir#27-311-514-817-1020-96-1010-012-815-617-11
Hem-fir#36-18-1011-313-815-115-37-89-911-1013-9
Southern pineSS8-112-916-1021-6Note b8-112-916-1021-6Note b
Southern pine#18-012-616-621-125-28-012-315-418-321-9
Southern pine#27-1012-315-1018-1122-27-510-813-916-519-3
Southern pine#36-59-612-114-417-15-78-310-612-514-9
Spruce-pine-firSS7-812-015-1020-224-77-812-015-418-921-9
Spruce-pine-fir#17-611-914-1018-221-06-1110-212-1015-818-3
Spruce-pine-fir#27-611-914-1018-221-06-1110-212-1015-818-3
Spruce-pine-fir#36-18-1011-313-815-115-37-89-911-1013-9
Check sources for availability of lumber in lengths greater than 20 feet.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479kPa.
a. The tabulated rafter spans assume that ceiling joists are located at the bottom of the attic space or that some other method of resisting the outward push of the rafters on the bearing walls, such as rafter ties, is provided at that location. When ceiling joists or rafter ties are located higher in the attic space, the rafter spans shall be multiplied by the factors given below:
HC/HRRafter Span Adjustment Factor
1/30.67
1/40.76
1/50.83
1/60.90
1/7.5 or less1.00

where:

HC
=
Height of ceiling joists or rafter ties measured vertically above the top of the rafter support walls.
HR
=
Height of roof ridge measured vertically above the top of the rafter support walls.

b. Span exceeds 26 feet in length.

TABLE 802.5.1(3)
RAFTER SPANS FOR COMMON LUMBER SPECIES
(Ground snow load=30 psf, ceiling not attached to rafters, L/Δ = 180)

RAFTER SPACING (inches)SPECIES AND GRADEDEAD LOAD = 10 psfDEAD LOAD = 20 psf
2 × 42 × 62 × 82 × 102 × 122 × 42 × 62 × 82 × 102 × 12
Maximum rafter spansa
(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)
12Douglas fir-larchSS10-015-920-9Note bNote b10-015-920-124-6Note b
Douglas fir-larch#19-814-918-822-9Note b9-013-216-820-423-7
Douglas fir-larch#29-513-917-521-424-88-512-415-719-122-1
Douglas fir-larch#37-110-513-216-118-86-49-411-914-516-8
Hem-firSS9-614-1019-725-0Note b9-614-1019-724-1Note b
Hem-fir#19-314-418-222-225-98-912-1016-319-1023-0
Hem-fir#28-1013-717-221-024-48-412-215-418-921-9
Hem-fir#37-110-513-216-118-86-49-411-914-516-8
Southern pineSS9-1015-620-5Note bNote b9-1015-620-5Note bNote b
Southern pine#19-815-220-024-9Note b9-814-1018-822-2Note b
Southern pine#29-614-518-822-3Note b9-012-1116-819-1123-4
Southern pine#37-711-214-316-1020-06-910-012-915-117-11
Spruce-pine-firSS9-314-719-224-6Note b9-314-718-822-9Note b
Spruce-pine-fir#19-113-917-521-424-88-512-415-719-122-1
Spruce-pine-fir#29-113-917-521-424-88-512-415-719-122-1
Spruce-pine-fir#37-110-513-216-118-86-49-411-914-516-8
16Douglas fir-larchSS9-114-418-1023-9Note b9-113-917-521-324-8
Douglas fir-larch#18-912-916-219-922-107-1011-514-517-820-5
Douglas fir-larch#28-211-1115-118-521-57-310-813-616-619-2
Douglas fir-larch#36-29-011-513-1116-25-68-110-312-614-6
Hem-firSS8-713-617-1022-9Note b8-713-617-120-1024-2
Hem-fir#18-512-515-919-322-37-711-114-117-219-11
Hem-fir#28-011-914-1118-221-17-210-613-416-318-10
Hem-fir#36-29-011-513-1116-25-68-110-312-614-6
Southern pineSS8-1114-118-623-8Note b8-1114-118-623-8Note b
Southern pine#18-913-918-121-525-78-812-1016-219-222-10
Southern pine#28-712-616-219-322-77-1011-214-517-320-2
Southern pine#36-79-812-414-717-45-108-811-013-015-6
Spruce-pine-firSS8-513-317-522-125-78-512-916-219-922-10
Spruce-pine-fir#18-211-1115-118-521-57-310-813-616-619-2
Spruce-pine-fir#28-211-1115-118-521-57-310-813-616-619-2
Spruce-pine-fir#36-29-011-513-1116-25-68-110-312-614-6
19.2Douglas fir-larchSS8-713-617-921-825-28-712-615-1019-522-6
Douglas fir-larch#17-1111-814-918-020-117-110-513-216-118-8
Douglas fir-larch#27-510-1113-916-1019-66-89-912-415-117-6
Douglas fir-larch#35-78-310-512-914-95-07-49-411-513-2
Hem-firSS8-112-916-921-424-88-112-415-719-122-1
Hem-fir#17-911-414-417-720-46-1110-212-1015-818-2
Hem-fir#27-410-913-716-719-36-79-712-214-1017-3
Hem-fir#35-78-310-512-914-95-07-49-411-513-2
Southern pineSS8-513-317-522-3Note b8-513-317-522-025-9
Southern pine#18-313-016-619-723-47-1111-914-917-620-11
Southern pine#27-1111-514-917-720-77-110-213-215-918-5
Southern pine#36-08-1011-313-415-105-47-1110-111-1114-2
Spruce-pine-firSS7-1112-516-520-223-47-1111-814-918-020-11
Spruce-pine-fir#17-510-1113-916-1019-66-89-912-415-117-6
Spruce-pine-fir#27-510-1113-916-1019-66-89-912-415-117-6
Spruce-pine-fir#35-78-310-512-914-95-07-49-411-513-2

(continued)

TABLE 802.5.1(3)—continued
RAFTER SPANS FOR COMMON LUMBER SPECIES
(Ground snow load=30 psf, ceiling not attached to rafters, L/Δ = 180)

RAFTER SPACING (inches)SPECIES AND GRADEDEAD LOAD = 10 psfDEAD LOAD = 20 psf
2 × 42 × 62 × 82 × 102 × 122 × 42 × 62 × 82 × 102 × 12
Maximum rafter spansa
(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)
24Douglas fir-larchSS7-1112-615-1019-522-67-811-314-217-420-1
Douglas fir-larch#17-110-513-216-118-86-49-411-914-516-8
Douglas fir-larch#26-89-912-415-117-65-118-811-013-615-7
Douglas fir-larch#35-07-49-411-513-24-66-78-410-211-10
Hem-firSS7-611-1015-719-122-17-611-013-1117-019-9
Hem-fir#16-1110-212-1015-818-26-29-111-614-016-3
Hem-fir#26-79-712-214-1017-35-108-710-1013-315-5
Hem-fir#35-07-49-411-513-24-66-78-410-211-10
Southern pineSS7-1012-316-220-825-17-1012-316-219-823-0
Southern pine#17-811-914-917-620-117-110-613-215-818-8
Southern pine#27-110-213-215-918-56-49-211-914-116-6
Southern pine#35-47-1110-111-1114-24-97-19-010-812-8
Spruce-pine-firSS7-411-714-918-020-117-110-513-216-118-8
Spruce-pine-fir#16-89-912-415-117-65-118-811-013-615-7
Spruce-pine-fir#26-89-912-415-117-65-118-811-013-615-7
Spruce-pine-fir#35-07-49-411-513-24-66-78-410-211-10
Check sources for availability of lumber in lengths greater than 20 feet.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479kPa.
a. The tabulated rafter spans assume that ceiling joists are located at the bottom of the attic space or that some other method of resisting the outward push of the rafters on the bearing walls, such as rafter ties, is provided at that location. When ceiling joists or rafter ties are located higher in the attic space, the rafter spans shall be multiplied by the factors given below:
HC/HRRafter Span Adjustment Factor
1/30.67
1/40.76
1/50.83
1/60.90
1/7.5 or less1.00

where:

HC =Height of ceiling joists or rafter ties measured vertically above the top of the rafter support walls.
HR =Height of roof ridge measured vertically above the top of the rafter support walls.

b. Span exceeds 26 feet in length.

TABLE 802.5.1(4)
RAFTER SPANS FOR COMMON LUMBER SPECIES
(Ground snow load=50 psf, ceiling not attached to rafters, L/Δ = 180)

RAFTER SPACING (inches)SPECIES AND GRADEDEAD LOAD = 10 psfDEAD LOAD = 20 psf
2 × 42 × 62 × 82 × 102 × 122 × 42 × 62 × 82 × 102 × 12
Maximum rafter spansa
(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)
12Douglas fir-larchSS8-513-317-622-426-08-513-317-020-924-0
Douglas fir-larch#18-212-015-318-721-77-711-214-117-320-0
Douglas fir-larch#27-811-314-317-520-27-110-513-216-118-8
Douglas fir-larch#35-108-610-913-215-35-57-1010-012-214-1
Hem-firSS8-012-616-621-125-68-012-616-620-423-7
Hem-fir#17-1011-914-1018-121-07-510-1013-916-919-5
Hem-fir#27-511-114-017-219-117-010-313-015-1018-5
Hem-fir#35-108-610-913-215-35-57-1010-012-214-1
Southern pineSS8-413-017-221-11Note b8-413-017-221-11Note b
Southern pine#18-212-1016-1020-324-18-212-615-918-922-4
Southern pine#28-011-915-318-221-37-710-1114-116-1019-9
Southern pine#36-29-211-813-916-45-98-510-912-915-2
Spruce-pine-firSS7-1012-316-220-824-17-1012-315-919-322-4
Spruce-pine-fir#17-811-314-317-520-27-110-513-216-118-8
Spruce-pine-fir#27-811-314-317-520-27-110-513-216-118-8
Spruce-pine-fir#35-108-610-913-215-35-57-1010-012-214-1
16Douglas fir-larchSS7-812-115-1019-522-67-811-714-817-1120-10
Douglas fir-larch#17-110-513-216-118-86-79-812-214-1117-3
Douglas fir-larch#26-89-912-415-117-66-29-011-513-1116-2
Douglas fir-larch#35-07-49-411-513-24-86-108-810-612-3
Hem-firSS7-311-515-019-122-17-311-514-517-820-5
Hem-fir#16-1110-212-1015-818-26-59-511-1114-616-10
Hem-fir#26-79-712-214-1017-36-18-1111-313-915-11
Hem-fir#35-07-49-411-513-24-86-108-810-612-3
Southern pineSS7-611-1015-719-1124-37-611-1015-719-1123-10
Southern pine#17-511-714-917-620-117-410-1013-816-219-4
Southern pine#27-110-213-215-918-56-79-512-214-717-1
Southern pine#35-47-1110-111-1114-24-117-49-411-013-1
Spruce-pine-firSS7-111-214-818-020-117-110-913-815-1119-4
Spruce-pine-fir#16-89-912-415-117-66-29-011-513-1116-2
Spruce-pine-fir#26-89-912-415-117-66-29-011-513-1116-2
Spruce-pine-fir#35-07-49-411-513-24-86-108-810-612-3
19.2Douglas fir-larchSS7-311-414-617-820-67-310-713-516-519-0
Douglas fir-larch#16-69-612-014-817-16-08-1011-213-715-9
Douglas fir-larch#26-18-1111-313-915-115-78-310-512-914-9
Douglas fir-larch#34-76-98-610-512-14-36-37-119-711-2
Hem-firSS6-1010-914-217-520-26-1010-513-216-118-8
Hem-fir#16-49-311-914-416-75-108-710-1013-315-5
Hem-fir#26-08-911-113-715-95-78-110-312-714-7
Hem-fir#34-76-98-610-512-14-36-37-119-711-2
Southern pineSS7-111-214-818-922-107-111-214-818 721-9
Southern pine#17-010-813-516-019-16-89-1112-514-1017-8
Southern pine#26-69-412-014-416-106-08-811-213-415-7
Southern pine#34-117-39-210-1012-114-66-88-610-112-0
Spruce-pine-firSS6-810-613-516-519-16-89-1012-515-317-8
Spruce-pine-fir#16-18-1111-313-915-115-78-310-512-914-9
Spruce-pine-fir#26-18-1111-313-915-115-78-310-512-914-9
Spruce-pine-fir#34-76-98-610-512-14-36-37-119-711-2

(continued)

TABLE 802.5.1(4)—continued
RAFTER SPANS FOR COMMON LUMBER SPECIES
(Ground snow load=50 psf, ceiling not attached to rafters, L/Δ = 180)

RAFTER SPACING (inches)SPECIES AND GRADEDEAD LOAD = 10 psfDEAD LOAD = 20 psf
2 × 42 × 62 × 82 × 102 × 122 × 42 × 62 × 82 × 102 × 12
Maximum rafter spansa
(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)
24Douglas fir-larchSS6-810-13-015-1018-46-69-612-014-817-0
Douglas fir-larch#15-108-610-913-215-35-57-1010-012-214-1
Douglas fir-larch#25-57-1110-112-414-35-07-49-411-513-2
Douglas fir-larch#34-16-07-79-410-93-105-77-18-710-0
Hem-firSS6-49-1112-915-718-06-49-411-914-516-8
Hem-fir#15-88-310-612-1014-105-37-89-911-1013-9
Hem-fir#25-47-109-1112-114-14-117-39-211-313-0
Hem-fir#34-16-07-79-410-93-105-77-18-710-0
Southern pineSS6-710-413-817-521-06-710-413-816-719-5
Southern pine#16-59-712-014-417-16-08-1011-213-315-9
Southern pine#25-108-410-912-1015-15-57-910-011-1113-11
Southern pine#34-46-58-39-911-74-16-07-79-010-8
Spruce-pine-firSS6-29-612-014-817-16-08-1011-213-715-9
Spruce-pine-fir#15-57-1110-112-414-35-07-49-411-513-2
Spruce-pine-fir#25-57-1110-112-414-35-07-49-411-513-2
Spruce-pine-fir#34-16-07-79-410-93-105-77-18-710-0
Check sources for availability of lumber in lengths greater than 20 feet.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479kPa.
a. The tabulated rafter spans assume that ceiling joists are located at the bottom of the attic space or that some other method of resisting the outward push of the rafters on the bearing walls, such as rafter ties, is provided at that location. When ceiling joists or rafter ties are located higher in the attic space, the rafter spans shall be multiplied by the factors given below:
HC/HRRafter Span Adjustment Factor
1/30.67
1/40.76
1/50.83
1/60.90
1/7.5 or less1.00

where:

HC =Height of ceiling joists or rafter ties measured vertically above the top of the rafter support walls.
HR =Height of roof ridge measured vertically above the top of the rafter support walls.

b. Span exceeds 26 feet in length.

TABLE 802.5.1(5)
RAFTER SPANS FOR COMMON LUMBER SPECIES
(Ground snow load=30 psf, ceiling attached to rafters, L/Δ = 240)

RAFTER SPACING (inches)SPECIES AND GRADEDEAD LOAD = 10 psfDEAD LOAD = 20 psf
2 × 42 × 62 × 82 × 102 × 122 × 42 × 62 × 82 × 102 × 12
Maximum rafter spansa
(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)
12Douglas fir-larchSS9-114-418-1024-1Note b9-114-418-1024-1Note b
Douglas fir-larch#18-913-918-222-9Note b8-913-216-820-423-7
Douglas fir-larch#28-713-617-521-424-88-512-415-719-122-1
Douglas fir-larch#37-110-513-216-118-86-49-411-914-516-8
Hem-firSS8-713-617-1022-9Note b8-713-617-1022-9Note b
Hem-fir#18-513-317-522-225-98-512-1016-319-1023-0
Hem-fir#28-012-716-721-024-48-012-215-418-921-9
Hem-fir#37-110-513-216-118-86-49-411-914-516-8
Southern pineSS8-1114-118-623-8Note b8-1114-118-623-8Note b
Southern pine#18-913-918-223-2Note b8-913-918-222-2Note b
Southern pine#28-713-617-1022-3Note b8-712-1116-819-1123-4
Southern pine#37-711-214-316-1020-06-910-012-915-117-11
Spruce-pine-firSS8-513-317-522-3Note b8-513-317-522-3Note b
Spruce-pine-fir#18-312-1117-021-424-88-312-415-719-122-1
Spruce-pine-fir#28-312-1117-021-424-88-312-415-719-122-1
Spruce-pine-fir#37-110-513-216-118-86-49-411-914-516-8
16Douglas fir-larchSS8-313-017-221-10Note b8-313-017-221-324-8
Douglas fir-larch#18-012-616-219-922-107-1011-514-517-820-5
Douglas fir-larch#27-1011-1115-118-521-57-310-813-616-619-2
Douglas fir-larch#36-29-011-513-1116-25-68-110-312-614-6
Hem-firSS7-1012-316-220-825-17-1012-316-220-824-2
Hem-fir#17-812-015-919-322-37-711-114-117-219-11
Hem-fir#27-311-514-1118-221-17-210-613-416-318-10
Hem-fir#36-29-011-513-1116-25-68-110-312-614-6
Southern pineSS8-112-916-1021-6Note b8-112-916-1021-6Note b
Southern pine#18-012-616-621-125-78-012-616-219-222-10
Southern pine#27-1012-316-219-322-77-1011-214-517-320-2
Southern pine#36-79-812-414-717-45-108-811-013-015-6
Spruce-pine-firSS7-812-015-1020-224-77-812-015-1019-922-10
Spruce-pine-fir#17-611-915-118-521-57-310-813-616-619-2
Spruce-pine-fir#27-611-915-118-521-57-310-813-616-619-2
Spruce-pine-fir#36-29-011-513-1116-25-68-110-312-614-6
19.2Douglas fir-larchSS7-912-316-120-725-07-912-315-1019-522-6
Douglas fir-larch#17-611-814-918-020-117-110-513-216-118-8
Douglas fir-larch#27-410-1113-916-1019-66-89-912-415-117-6
Douglas fir-larch#35-78-310-512-914-95-07-49-411-513-2
Hem-firSS7-411-715-319-523-77-411-715-319-122-1
Hem-fir#17-211-414-417-720-46-1110-212-1015-818-2
Hem-fir#26-1010-913-716-719-36-79-712-214-1017-3
Hem-fir#35-78-310-512-914-95-07-49-411-513-2
Southern pineSS7-812-015-1020-224-77-812-015-1020-224-7
Southern pine#17-611-915-619-723-47-611-914-917-620-11
Southern pine#27-411-514-917-720-77-110-213-215-918-5
Southern pine#36-08-1011-313-415-105-47-1110-111-1114-2
Spruce-pine-firSS7-211-414-1119-023-17-211-414-918-020-11
Spruce-pine-fir#17-010-1113-916-1019-66-89-912-415-117-6
Spruce-pine-fir#27-010-1113-916-1019-66-89-912-415-117-6
Spruce-pine-fir#35-78-310-512-914-95-07-49-411-513-2

(continued)

TABLE 802.5.1(5)—continued
RAFTER SPANS FOR COMMON LUMBER SPECIES
(Ground snow load=30 psf, ceiling attached to rafters, L/Δ = 240)

RAFTER SPACING (inches)SPECIES AND GRADEDEAD LOAD = 10 psfDEAD LOAD = 20 psf
2 × 42 × 62 × 82 × 102 × 122 × 42 × 62 × 82 × 102 × 12
Maximum rafter spansa
(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)
24Douglas fir-larchSS7-311-415-019-122-67-311-314-217-420-1
Douglas fir-larch#17-010-513-216-118-86-49-411-914-516-8
Douglas fir-larch#26-89-912-415-117-65-118-811-013-615-7
Douglas fir-larch#35-07-49-411-513-24-66-78-410-211-10
Hem-firSS6-1010-914-218-021-116-1010-913-1117-019-9
Hem-fir#16-810-212-1015-818-26-29-111-614-016-3
Hem-fir#26-49-712-214-1017-35-108-710-1013-315-5
Hem-fir#35-07-49-411-513-24-66-78-410-211-10
Southern pineSS7-111-214-818-922-107-111-214-818-922-10
Southern pine#17-010-1114-517-620-117-010-613-215-818-8
Southern pine#26-1010-213-215-918-56-49-211-914-116-6
Southern pine#35-47-1110-111-1114-24-97-19-010-812-8
Spruce-pine-firSS6-810-613-1017-820-116-810-513-216-118-8
Spruce-pine-fir#16-69-912-415-117-65-118-811-013-615-7
Spruce-pine-fir#26-69-912-415-117-65-118-811-013-615-7
Spruce-pine-fir#35-07-49-411-513-24-66-78-410-211-10
Check sources for availability of lumber in lengths greater than 20 feet.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479kPa.
a. The tabulated rafter spans assume that ceiling joists are located at the bottom of the attic space or that some other method of resisting the outward push of the rafters on the bearing walls, such as rafter ties, is provided at that location. When ceiling joists or rafter ties are located higher in the attic space, the rafter spans shall be multiplied by the factors given below:
HC/HRRafter Span Adjustment Factor
1/30.67
1/40.76
1/50.83
1/60.90
1/7.5 or less1.00

where:

HC =Height of ceiling joists or rafter ties measured vertically above the top of the rafter support walls.
HR =Height of roof ridge measured vertically above the top of the rafter support walls.

b. Span exceeds 26 feet in length.

TABLE 802.5.1(6)
RAFTER SPANS FOR COMMON LUMBER SPECIES
(Ground snow load=50 psf, ceiling attached to rafters, L/Δ = 240)

RAFTER SPACING (inches)SPECIES AND GRADEDEAD LOAD = 10 psfDEAD LOAD = 20 psf
2 × 42 × 62 × 82 × 102 × 122 × 42 × 62 × 82 × 102 × 12
Maximum rafter spansa
(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)
12Douglas fir-larchSS7-812-115-1120-324-87-812-115-1120-324-0
Douglas fir-larch#17-511-715-318-721-77-511-214-117-320-0
Douglas fir-larch#27-311-314-317-520-27-110-513-216-118-8
Douglas fir-larch#35-108-610-913-215-35-57-1010-012-214-1
Hem-firSS7-311-515-019-223-47-311-515-019-223-4
Hem-fir#17-111-214-818-121-07-110-1013-916-919-5
Hem-fir#26-910-814-017-219-116-910-313-015-1018-5
Hem-fir#35-108-610-913-215-35-57-1010-012-214-1
Southern pineSS7-611-1015-719-1124-37-611-1015-719-1124-3
Southern pine#17-511-715-419-723-97-511-715-418-922-4
Southern pine#27-311-515-018-221-37-310-1114-116-1019-9
Southern pine#36-29-211-813-916-45-98-510-912-915-2
Spruce-pine-firSS7-111-214-818-922-107-111-214-818-922-4
Spruce-pine-fir#16-1110-1114-317-520-26-1110-513-216-118-8
Spruce-pine-fir#26-1110-1114-317-520-26-1110-513-216-118-8
Spruce-pine-fir#35-108-610-913-215-35-57-1010-012-214-1
16Douglas fir-larchSS7-011-014-518-522-57-011-014-517-1120-10
Douglas fir-larch#16-910-513-216-118-86-79-812-214-1117-3
Douglas fir-larch#26-79-912-415-117-66-29-011-513-1116-2
Douglas fir-larch#35-07-49-411-513-24-86-108-810-612-3
Hem-firSS6-710-413-817-521-26-710-413-817-520-5
Hem-fir#16-510-212-1015-818-26-59-511-1114-616-10
Hem-fir#26-29-712-214-1017-36-18-1111-313-915-11
Hem-fir#35-07-49-411-513-24-86-108-810-612-3
Southern pineSS6-1010-914-218-122-06-1010-914-218-122-0
Southern pine#16-910-713-1117-620-116-910-713-816-219-4
Southern pine#26-710-213-215-918-56-79-512-214-717-1
Southern pine#35-47-1110-111-1114-24-117-49-411-013-1
Spruce-pine-firSS6-510-213-417-020-96-510-213-416-819-4
Spruce-pine-fir#16-49-912-415-117-66-29-011-513-1116-2
Spruce-pine-fir#26-49-912-415-117-66-29-011-513-1116-2
Spruce-pine-fir#35-07-49-411-513-24-86-108-810-612-3
19.2Douglas fir-larchSS6-710-413-717-420-66-710-413-516-519-0
Douglas fir-larch#16-49-612-014-817-16-08-1011-213-715-9
Douglas fir-larch#26-18-1111-313-915-115-78-310-512-914-9
Douglas fir-larch#34-76-98-610-512-14-36-37-119-711-2
Hem-firSS6-29-912-1016-519-116-29-912-1016-118-8
Hem-fir#16-19-311-914-416-75-108-710-1013-315-5
Hem-fir#25-98-911-113-715-95-78-110-312-714-7
Hem-fir#34-76-98-610-512-14-36-37-119-711-2
Southern pineSS6-510-213-417-020-96-510-213-417-020-9
Southern pine#16-49-1113-116-019-16-49-1112-514-1017-8
Southern pine#26-29-412-014-416-106-08-811-213-415-7
Southern pine#34-117-39-210-1012-114-66-88-610-112-0
Spruce-pine-firSS6-19-612-716-019-16-19-612-515-317-8
Spruce-pine-fir#15-118-1111-313-915-115-78-310-512-914-9
Spruce-pine-fir#25-118-1111-313-915-115-78-310-512-914-9
Spruce-pine-fir#34-76-98-610-512-14-36-37-119-711-2

(continued)

TABLE 802.5.1(6)—continued
RAFTER SPANS FOR COMMON LUMBER SPECIES
(Ground snow load=50 psf, ceiling attached to rafters, L/Δ = 240)

RAFTER SPACING (inches)SPECIES AND GRADEDEAD LOAD = 10 psfDEAD LOAD = 20 psf
2 × 42 × 62 × 82 × 102 × 122 × 42 × 62 × 82 × 102 × 12
Maximum rafter spansa
(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)
24Douglas fir-larchSS6-19-712-715-1018-46-19-612-014-817-0
Douglas fir-larch#15-108-610-913-215-35-57-1010-012-214-1
Douglas fir-larch#25-57-1110-112-414-35-07-49-411-513-2
Douglas fir-larch#34-16-07-79-410-93-105-77-18-710-0
Hem-firSS5-99-111-1115-218-05-99-111-914-515-11
Hem-fir#15-88-310-612-1014-105-37-89-911-1013-9
Hem-fir#25-47-109-1112-114-14-117-39-211-313-0
Hem-fir#34-16-07-79-410-93-105-77-18-710-0
Southern pineSS6-09-512-515-1019-36-09-512-515-1019-3
Southern pine#15-109-312-014-417-15-108-1011-213-315-9
Southern pine#25-98-410-912-1015-15-57-910-011-1113-11
Southern pine#34-46-58-39-911-74-16-07-79-010-8
Spruce-pine-firSS5-88-1011-814-817-15-88-1011-213-715-9
Spruce-pine-fir#15-57-1110-112-414-35-07-49-411-513-2
Spruce-pine-fir#25-57-1110-112-414-35-07-49-411-513-2
Spruce-pine-fir#34-16-07-79-410-93-105-77-18-710-0
Check sources for availability of lumber in lengths greater than 20 feet.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479kPa.
a. The tabulated rafter spans assume that ceiling joists are located at the bottom of the attic space or that some other method of resisting the outward push of the rafters on the bearing walls, such as rafter ties, is provided at that location. When ceiling joists or rafter ties are located higher in the attic space, the rafter spans shall be multiplied by the factors given below:
HC/HRRafter Span Adjustment Factor
1/30.67
1/40.76
1/50.83
1/60.90
1/7.5 or less1.00
where:
HC =Height of ceiling joists or rafter ties measured vertically above the top of the rafter support walls.
HR =Height of roof ridge measured vertically above the top of the rafter support walls.

TABLE 802.5.1(7)
RAFTER SPANS FOR 70 PSF GROUND SNOW LOAD
(Ceiling not attached to rafters, L/Δ = 180)

RAFTER SPACING (inches)SPECIES AND GRADEDEAD LOAD = 10 psfDEAD LOAD = 20 psf
2 × 42 × 62 × 82 × 102 × 122 × 42 × 62 × 82 × 102 × 12
Maximum Rafter Spansa
(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)
12Douglas fir-larchSS7-711-1015-819-522-67-711-1015-018-321-2
Douglas fir-larch#17-110-513-216-118-86-89-1012-515-217-7
Douglas fir-larch#26-89-912-415-117-66-39-211-814-216-6
Douglas fir-larch#35-07-49-411-513-24-96-118-910-912-5
Hem-firSS7-211-314-918-1022-17-211-314-818-020-10
Hem-fir#16-1110-212-1015-818-26-69-712-114-1017-2
Hem-fir#26-79-712-214-1017-36-29-111-514-016-3
Hem-fir#35-07-49-411-513-24-96-118-910-912-5
Southern pineSS7-511-815-419-723-107-511-815-419-723-10
Southern pine#17-311-514-917-620-117-311-113-1116-619-8
Southern pine#27-110-213-215-918-56-89-712-514-1017-5
Southern pine#35-47-1110-111-1114-25-17-59-611-313-4
Spruce-pine-firSS7-011-014-618-020-117-011-013-1117-019-8
Spruce-pine-fir#16-89-912-415-117-66-39-211-814-216-6
Spruce-pine-fir#26-89-912-415-117-66-39-211-814-216-6
Spruce-pine-fir#35-07-49-411-513-24-96-118-910-912-5
16Douglas fir-larchSS6-1010-913-916-1019-66-1010-313-015-1018-4
Douglas fir-larch#16-29-011-513-1116-25-108-610-913-215-3
Douglas fir-larch#25-98-510-813-115-25-57-1110-112-414-3
Douglas fir-larch#34-46-48-19-1011-54-16-07-79-410-9
Hem-firSS6-610-213-516-619-26-610-112-915-718-0
Hem-fir#16-08-911-213-715-95-88-310-612-1014-10
Hem-fir#25-88-410-612-1014-115-47-109-1112-114-1
Hem-fir#34-46-48-19-1011-54-16-07-79-410-9
Southern pineSS6-910-714-017-1021-86-910-714-017-1021-0
Southern pine#16-710-212-915-218-16-59-712-014-417-1
Southern pine#26-28-1011-513-716-05-108-410-912-1015-1
Southern pine#34-86-108-910-412-34-46-58-39-911-7
Spruce-pine-firSS6-410-012-915-718-16-49-612-014-817-1
Spruce-pine-fir#15-98-510-813-115-25-57-1110-112-414-3
Spruce-pine-fir#25-98-510-813-115-25-57-1110-112-414-3
Spruce-pine-fir#34-46-48-19-1011-54-16-07-79-410-9
19.2Douglas fir-larchSS6-59-1112-715-417-96-59-411-1014-516-9
Douglas fir-larch#15-78-310-512-914-95-47-99-1012-013-11
Douglas fir-larch#25-37-89-911-1113-105-07-39-211-313-0
Douglas fir-larch#34-05-107-49-010-53-95-66-118-69-10
Hem-firSS6-19-712-415-117-46-19-211-814-215-5
Hem-fir#15-68-010-212-514-55-27-79-711-813-7
Hem-fir#25-27-79-711-913-74-117-29-111-112-10
Hem-fir#34-05-107-49-010-53-95-66-118-69-10
Southern pineSS6-410-013-216-920-46-410-013-216-519-2
Southern pine#16-39-311-813-1016-65-118-911-013-115-7
Southern pine#25-78-110-512-514-75-47-79-1011-913-9
Southern pine#34-36-38-09-511-24-05-117-68-1010-7
Spruce-pine-firSS6-09-211-814-316-65-118-811-013-515-7
Spruce-pine-fir#15-37-89-911-1113-105-07-39-211-313-0
Spruce-pine-fir#25-37-89-911-1113-105-07-39-211-313-0
Spruce-pine-fir#34-05-107-49-010-53-95-66-118-69-10

(continued)

TABLE 802.5.1(7)—continued
RAFTER SPANS FOR 70 PSF GROUND SNOW LOAD
(Ceiling not attached to rafters, L/Δ = 180)

RAFTER SPACING (inches)SPECIES AND GRADEDEAD LOAD = 10 psfDEAD LOAD = 20 psf
2 × 42 × 62 × 82 × 102 × 122 × 42 × 62 × 82 × 102 × 12
Maximum rafter spansa
(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)
24Douglas fir-larchSS6-08-1011-313-915-115-98-410-712-1115-0
Douglas fir-larch#15-07-49-411-513-24-96-118-910-912-5
Douglas fir-larch#24-86-118-910-812-44-56-68-310-011-8
Douglas fir-larch#33-75-26-78-19-43-44-116-37-78-10
Hem-firSS5-88-811-013-613-115-78-310-512-412-4
Hem-fir#14-117-29-111-112-104-76-98-710-612-2
Hem-fir#24-86-98-710-612-24-46-58-19-1111-6
Hem-fir#33-75-26-78-19-43-44-116-37-78-10
Southern pineSS5-119-312-215-718-25-119-312-214-817-2
Southern pine#15-78-310-512-514-95-37-109-1011-813-11
Southern pine#25-07-39-411-113-04-96-108-910-612-4
Southern pine#33-95-77-18-510-03-75-36-97-119-5
Spruce-pine-firSS5-68-310-512-914-95-47-99-1012-012-11
Spruce-pine-fir#14-86-118-910-812-44-56-68-310-011-8
Spruce-pine-fir#24-86-118-910-812-44-56-68-310-011-8
Spruce-pine-fir#33-75-26-78-19-43-44-116-37-78-10
Check sources for availability of lumber in lengths greater than 20 feet.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479kPa.
a. The tabulated rafter spans assume that ceiling joists are located at the bottom of the attic space or that some other method of resisting the outward push of the rafters on the bearing walls, such as rafter ties, is provided at that location. When ceiling joists or rafter ties are located higher in the attic space, the rafter spans shall be multiplied by the factors given below:
HC/HRRafter Span Adjustment Factor
1/30.67
1/40.76
1/50.83
1/60.90
1/7.5 or less1.00
where:
HC =Height of ceiling joists or rafter ties measured vertically above the top of the rafter support walls.
HR =Height of roof ridge measured vertically above the top of the rafter support walls.

TABLE 802.5.1(8)
RAFTER SPANS FOR 70 PSF GROUND SNOW LOAD
(Ceiling attached to rafters, L/Δ = 240)

RAFTER SPACING (inches)SPECIES AND GRADEDEAD LOAD = 10 psfDEAD LOAD = 20 psf
2 × 42 × 62 × 82 × 102 × 122 × 42 × 62 × 82 × 102 × 12
Maximum rafter spansa
(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)
12Douglas fir-larchSS6-1010-914-318-222-16-1010-914-318-221-2
Douglas fir-larch#16-710-513-216-118-86-79-1012-515-217-7
Douglas fir-larch#26-69-912-415-117-66-39-211-814-216-6
Douglas fir-larch#35-07-49-411-513-24-96-118-910-912-5
Hem-firSS6-610-213-517-220-106-610-213-517-220-10
Hem-fir#16-410-012-1015-818-26-49-712-114-1017-2
Hem-fir#26-19-612-214-1017-36-19-111-514-016-3
Hem-fir#35-07-49-411-513-24-96-118-910-912-5
Southern pineSS6-910-714-017-1021-86-910-714-017-1021-8
Southern pine#16-710-513-817-620-116-710-513-816-619-8
Southern pine#26-610-213-215-918-56-69-712-514-1017-5
Southern pine#35-47-1110-111-1114-25-17-59-611-313-4
Spruce-pine-firSS6-410-013-216-920-56-410-013-216-919-8
Spruce-pine-fir#16-29-912-415-117-66-29-211-814-216-6
Spruce-pine-fir#26-29-912-415-117-66-29-211-814-216-6
Spruce-pine-fir#35-07-49-411-513-24-96-118-910-912-5
16Douglas fir-larchSS6-39-1012-1116-619-66-39-1012-1115-1018-4
Douglas fir-larch#16-09-011-513-1116-25-108-610-913-215-3
Douglas fir-larch#25-98-510-813-115-25-57-1110-112-414-3
Douglas fir-larch#34-46-48-19-1011-54-16-07-79-410-9
Hem-firSS5-119-312-215-718-115-119-312-215-718-0
Hem-fir#15-98-911-213-715-95-88-310-612-1014-10
Hem-fir#25-68-410-612-1014-115-47-109-1112-114-1
Hem-fir#34-46-48-19-1011-54-16-07-79-410-9
Southern pineSS6-19-712-816-219-86-19-712-816-219-8
Southern pine#16-09-512-515-218-16-09-512-014-417-1
Southern pine#25-118-1011-513-716-05-108-410-912-1015-1
Southern pine#34-86-108-910-412-34-46-58-39-911-7
Spruce-pine-firSS5-99-111-1115-318-15-99-111-1114-817-1
Spruce-pine-fir#15-88-510-813-115-25-57-1110-112-414-3
Spruce-pine-fir#25-88-510-813-115-25-57-1110-112-414-3
Spruce-pine-fir#34-46-48-19-1011-54-16-07-79-410-9
19.2Douglas fir-larchSS5-109-312-215-417-95-109-311-1014-516-9
Douglas fir-larch#15-78-310-512-914-95-47-99-1012-013-11
Douglas fir-larch#25-37-89-911-1113-105-07-39-211-313-0
Douglas fir-larch#34-05-107-49-010-53-95-66-118-69-10
Hem-firSS5-68-811-614-817-45-68-811-614-215-5
Hem-fir#15-58-010-212-514-55-27-79-711-813-7
Hem-fir#25-27-79-711-913-74-117-29-111-112-10
Hem-fir#34-05-107-49-010-53-95-66-118-69-10
Southern pineSS5-99-111-1115-318-65-99-111-1115-318-6
Southern pine#15-88-1111-813-1016-65-88-911-013-115-7
Southern pine#25-68-110-512-514-75-47-79-1011-913-9
Southern pine#34-36-38-09-511-24-05-117-68-1010-7
Spruce-pine-firSS5-58-611-314-316-65-58-611-013-515-7
Spruce-pine-fir#15-37-89-911-1113-105-07-39-211-313-0
Spruce-pine-fir#25-37-89-911-1113-105-07-39-211-313-0
Spruce-pine-fir#34-05-107-49-010-53-95-66-118-69-10

(continued)

TABLE 802.5.1(8)—continued
RAFTER SPANS FOR 70 PSF GROUND SNOW LOADa
(Ceiling attached to rafters, L/Δ = 240)

RAFTER SPACING (inches)SPECIES AND GRADEDEAD LOAD = 10 psfDEAD LOAD = 20 psf
2 × 42 × 62 × 82 × 102 × 122 × 42 × 62 × 82 × 102 × 12
Maximum rafter spansa
(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)(feet - inches)
24Douglas fir-larchSS5-58-711-313-915-115-58-410-712-1115-0
Douglas fir-larch#15-07-49-411-513-24-96-118-910-912-5
Douglas fir-larch#24-86-118-910-812-44-56-68-310-011-8
Douglas fir-larch#33-75-26-78-19-43-44-116-37-78-10
Hem-firSS5-28-110-813-613-115-28-110-512-412-4
Hem-fir#14-117-29-111-112-104-76-98-710-612-2
Hem-fir#24-86-98-710-612-24-46-58-19-1111-6
Hem-fir#33-75-26-78-19-43-44-116-37-78-10
Southern pineSS5-48-511-114-217-25-48-511-114-217-2
Southern pine#15-38-310-512-514-95-37-109-1011-813-11
Southern pine#25-07-39-411-113-04-96-108-910-612-4
Southern pine#33-95-77-18-510-03-75-36-97-119-5
Spruce-pine-firSS5-07-1110-512-914-95-07-99-1012-012-11
Spruce-pine-fir#14-86-118-910-812-44-56-68-310-011-8
Spruce-pine-fir#24-86-118-910-812-44-56-68-310-011-8
Spruce-pine-fir#33-75-26-78-19-43-44-116-37-78-10
Check sources for availability of lumber in lengths greater than 20 feet.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479kPa.
a. The tabulated rafter spans assume that ceiling joists are located at the bottom of the attic space or that some other method of resisting the outward push of the rafters on the bearing walls, such as rafter ties, is provided at that location. When ceiling joists or rafter ties are located higher in the attic space, the rafter spans shall be multiplied by the factors given below:
HC/HRRafter Span Adjustment Factor
1/30.67
1/40.76
1/50.83
1/60.90
1/7.5 or less1.00
where:
HC =Height of ceiling joists or rafter ties measured vertically above the top of the rafter support walls.
HR =Height of roof ridge measured vertically above the top of the rafter support walls.

TABLE 802.5.1(9)
RAFTER/CEILING JOIST HEEL JOINT CONNECTIONSa, b, c, d, e, f, h

RAFTER
SLOPE
RAFTER
SPACING
(inches)
GROUND SNOW LOAD (psf)
20g305070
Roof span (feet)
12202836122028361220283612202836
Required number of 16d common nailsa, b per heel joint splicesc, d, e, f
3:121246810468115812156111520
1658101358111461115208142026
2471115197111621916233012213039
4:12123568356856911581215
1646810468114812156111520
2458121559121671217229162329
5:121234563457357947912
163568357947912591216
244791247101361014187131823
7:12123445334534573579
1634563456357946911
2435793579471013591317
9:12123344333433453457
163445334534573579
243467346736810471013
12:12123333333333343345
163344333433453457
2434453346346836810
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479kPa.
a. 40d box nails shall be permitted to be substituted for 16d common nails.
b. Nailing requirements shall be permitted to be reduced 25 percent if nails are clinched.
c. Heel joint connections are not required when the ridge is supported by a load-bearing wall, header or ridge beam.
d. When intermediate support of the rafter is provided by vertical struts or purlins to a loadbearing wall, the tabulated heel joint connection requirements shall be permitted to be reduced proportionally to the reduction in span.
e. Equivalent nailing patterns are required for ceiling joist to ceiling joist lap splices.
f. When rafter ties are substituted for ceiling joists, the heel joint connection requirement shall be taken as the tabulated heel joint connection requirement for two-thirds of the actual rafter-slope.
g. Applies to roof live load of 20 psf or less.
h. Tabulated heel joint connection requirements assume that ceiling joists or rafter ties are located at the bottom of the attic space. When ceiling joists or rafter ties are located higher in the attic, heel joint connection requirements shall be increased by the following factors:
HC/HRHeel Joint Connection
Adjustment Factor
1/31.5
1/41.33
1/51.25
1/61.2
1/10 or less1.11
where:
HC =Height of ceiling joists or rafter ties measured vertically above the top of the rafter support walls.
HR =Height of roof ridge measured vertically above the top of the rafter support walls.
For SI: 1 inch = 25.4 mm, 1 foot = 305 mm, 1 degree = 0.018 rad.
Note: Where ceiling joints run perpendicular to the rafters, rafter ties shall be nailed to each rafter near the top of the ceiling joist.

FIGURE 802.5.1
BRACED RAFTER CONSTRUCTION

The ends of each rafter or ceiling joist shall have not less than 1 1 / 2 inches (38 mm) of bearing on wood or metal and not less than 3 inches (76 mm) on masonry or concrete.
If the finished ceiling material is installed on the ceiling prior to the attachment of the ceiling to the walls, such as in construction at a factory, a compression strip of the same thickness as the finish ceiling material shall be installed directly above the top plate of bearing walls if the compressive strength of the finish ceiling material is less than the loads it will be required to withstand. The compression strip shall cover the entire length of such top plate and shall be at least one-half the width of the top plate. It shall be of material capable of transmitting the loads transferred through it.
Structural roof members shall not be cut, bored or notched in excess of the limitations specified in this section.

Notches in solid lumber joists, rafters, blocking and beams shall not exceed one-sixth of the depth of the member, shall not be longer than one-third of the depth of the member and shall not be located in the middle one-third of the span. Notches at the ends of the member shall not exceed one-fourth the depth of the member. The tension side of members 4 inches (102 mm) or greater in nominal thickness shall not be notched except at the ends of the members. The diameter of the holes bored or cut into members shall not exceed one-third the depth of the member. Holes shall not be closer than 2 inches (51 mm) to the top or bottom of the member, or to any other hole located in the member. Where the member is also notched, the hole shall not be closer than 2 inches (51 mm) to the notch.

Exception: Notches on cantilevered portions of rafters are permitted provided the dimension of the remaining portion of the rafter is not less than 4-inch nominal (102 mm) and the length of the cantilever does not exceed 24 inches (610 mm).
Cuts, notches and holes bored in trusses, structural composite lumber, structural glue-laminated members or I-joists are prohibited except where permitted by the manufacturer’s recommendations or where the effects of such alterations are specifically considered in the design of the member by a registered design professional.

Roof framing members and ceiling joists having a depth-to-thickness ratio exceeding 5 to 1 based on nominal dimensions shall be provided with lateral support at points of bearing to prevent rotation. For roof rafters with ceiling joists attached per Table 602.3(1), the depth-thickness ratio for the total assembly shall be determined using the combined thickness of the rafter plus the attached ceiling joist.

Exception: Roof trusses shall be braced in accordance with Section 802.10.3.
Rafters and ceiling joists having a depthto-thickness ratio exceeding 6 to 1 based on nominal dimensions shall be supported laterally by solid blocking, diagonal bridging (wood or metal) or a continuous 1-inch by 3-inch (25 mm by 76 mm) wood strip nailed across the rafters or ceiling joists at intervals not exceeding 8 feet (2438 mm).
Openings in roof and ceiling framing shall be framed with header and trimmer joists. When the header joist span does not exceed 4 feet (1219 mm), the header joist may be a single member the same size as the ceiling joist or rafter. Single trimmer joists may be used to carry a single header joist that is located within 3 feet (914 mm) of the trimmer joist bearing. When the header joist span exceeds 4 feet (1219 mm), the trimmer joists and the header joist shall be doubled and of sufficient cross section to support the ceiling joists or rafter framing into the header. Approved hangers shall be used for the header joist to trimmer joist connections when the header joist span exceeds 6 feet (1829 mm). Tail joists over 12 feet (3658 mm) long shall be supported at the header by framing anchors or on ledger strips not less than 2 inches by 2 inches (51 mm by 51 mm).

Truss design drawings, prepared in conformance to Section 802.10.1, shall be provided to the building official and approved prior to installation. Truss design drawings shall include, at a minimum, the information specified below. Truss design drawing shall be provided with the shipment of trusses delivered to the jobsite.

1. Slope or depth, span and spacing.

2. Location of all joints.

3. Required bearing widths.

4. Design loads as applicable.

4.1. Top chord live load (as determined from Section 301.6).

4.2. Top chord dead load.

4.3. Bottom chord live load.

4.4. Bottom chord dead load.

4.5. Concentrated loads and their points of application.

4.6. Controlling wind and earthquake loads.

5. Adjustments to lumber and joint connector design values for conditions of use.

6. Each reaction force and direction.

7. Joint connector type and description (e.g., size, thickness or gage) and the dimensioned location of each joint connector except where symmetrically located relative to the joint interface.

8. Lumber size, species and grade for each member.

9. Connection requirements for:

9.1. Truss to girder-truss.

9.2. Truss ply to ply.

9.3. Field splices.

10. Calculated deflection ratio and/or maximum description for live and total load.

11. Maximum axial compression forces in the truss members to enable the building designer to design the size, connections and anchorage of the permanent continuous lateral bracing. Forces shall be shown on the truss design drawing or on supplemental documents.

12. Required permanent truss member bracing location.

Wood trusses shall be designed in accordance with accepted engineering practice. The design and manufacture of metal-plate-connected wood trusses shall comply with ANSI/TPI 1. The truss design drawings shall be prepared by a registered professional where required by the statutes of the jurisdiction in which the project is to be constructed in accordance with Section 106.1.
The provisions of this section shall control the design of truss roof framing when snow controls for buildings not greater than 60 feet (18 288 mm) in length perpendicular to the joist, rafter or truss span, not greater than 36 feet (10 973 mm) in width parallel to the joist, rafter or truss span, not greater than two stories in height with each story not greater than 10 feet (3048 mm) high, and roof slopes not smaller than 3:12 (25-percent slope) or greater than 12:12 (100-percent slope). Truss roof framing constructed in accordance with the provisions of this section shall be limited to sites subjected to a maximum design wind speed of 110 miles per hour (49 m/s), Exposure A, B or C, and a maximum ground snow load of 70 psf (3352 Pa). For consistent loading of all truss types, roof snow load is to be computed as: 0.7 p g .
Trusses shall be braced to prevent rotation and provide lateral stability in accordance with the requirements specified in the construction documents for the building and on the individual truss design drawings. In the absence of specific bracing requirements, trusses shall be braced in accordance with the Building Component Safety Information (BCSI 1-03) Guide to Good Practice for Handling, Installing & Bracing of Metal Plate Connected Wood Trusses.
Truss members shall not be cut, notched, drilled, spliced or otherwise altered in any way without the approval of a registered design professional. Alterations resulting in the addition of load (e.g., HVAC equipment, water heater) that exceeds the design load for the truss shall not be permitted without verification that the truss is capable of supporting such additional loading.
Trusses shall be connected to wall plates by the use of approved connectors having a resistance to uplift of not less than 175 pounds (779 N) and shall be installed in accordance with the manufacturer’s specifications. For roof assemblies subject to wind uplift pressures of 20 pounds per square foot (960 Pa) or greater, as established in Table 301.2(2), adjusted for height and exposure per Table 301.2(3), see Section 802.11.

TABLE 802.11
REQUIRED STRENGTH OF TRUSS OR RAFTER CONNECTIONS TO RESIST WIND UPLIFT FORCESa, b, c, e, f
(Pounds per connection)

BASIC WIND SPEED
(mph) (3–second gust)
ROOF SPAN (feet)OVERHANGSd
(pounds/foot)
12202428323640
85-72-120-145-169-193-217-241-38.55
90-91-151-181-212-242-272-302-43.22
100-131-218-262-305-349-393-436-53.36
110-175-292-351-409-467-526-584-64.56
For SI: 1 inch = 25.4 mm, 1 foot = 305 mm, 1 mph = 0.447 m/s, 1 pound/foot = 14.5939 N/m, 1 pound = 0.454 kg.
a. The uplift connection requirements are based on a 30 foot mean roof height located in Exposure B. For Exposures C and D and for other mean roof heights, multiply the above loads by the Adjustment Coefficients in Table 301.2(3).
b. The uplift connection requirements are based on the framing being spaced 24 inches on center. Multiply by 0.67 for framing spaced 16 inches on center and multiply by 0.5 for framing spaced 12 inches on center.
c. The uplift connection requirements include an allowance for 10 pounds of dead load.
d. The uplift connection requirements do not account for the effects of overhangs. The magnitude of the above loads shall be increased by adding the overhang loads found in the table. The overhang loads are also based on framing spaced 24 inches on center. The overhang loads given shall be multiplied by the overhang projection and added to the roof uplift value in the table.
e. The uplift connection requirements are based on wind loading on end zones as defined in Figure 6-2 of ASCE 7. Connection loads for connections located a distance of 20% of the least horizontal dimension of the building from the corner of the building are permitted to be reduced by multiplying the table connection value by 0.7 and multiplying the overhang load by 0.8.
f. For wall-to-wall and wall-to-foundation connections, the capacity of the uplift connector is permitted to be reduced by 100 pounds for each full wall above. (For example, if a 600-pound rated connector is used on the roof framing, a 500-pound rated connector is permitted at the next floor level down).

Roof assemblies which are subject to wind uplift pressures of 20 pounds per square foot (960 Pa) or greater shall have roof rafters or trusses attached to their supporting wall assemblies by connections capable of providing the resistance required in Table 802.11. Wind uplift pressures shall be determined using an effective wind area of 100 square feet (9.3 m2) and Zone 1 in Table 301.2(2), as adjusted for height and exposure per Table 301.2(3).

A continuous load path shall be designed to transmit the uplift forces from the rafter or truss ties to the foundation.

Allowable spans for lumber used as roof sheathing shall conform to Table 803.1. Spaced lumber sheathing for wood shingle and shake roofing shall conform to the requirements of Sections 905.7 and 905.8. Spaced lumber sheathing is not allowed in Seismic Design Category D2.

TABLE 803.1
MINIMUM THICKNESS OF LUMBER ROOF SHEATHING

RAFTER OR BEAM SPACING
(inches)
MINIMUM NET THICKNESS
(inches)
245/8
48a11/2 T & G
60b
72c
For SI: 1 inch = 25.4 mm.
a. Minimum 270 Fb, 340,000 E.
b. Minimum 420 Fb, 660,000 E.
c. Minimum 600 Fb, 1,150,000 E.
Wood structural panels shall conform to DOC PS 1, DOC PS 2 or, when manufactured in Canada, CSA O437 or CSA O325, and shall be identified by a grade mark or certificate of inspection issued by an approved agency. Wood structural panels shall comply with the gradesspecified in Table 503.2.1.1(1).
All wood structural panels, when designed to be permanently exposed in outdoor applications, shall be of an exterior exposure durability. Wood structural panel roof sheathing exposed to the underside may be of interior type bonded with exterior glue, identified as Exposure 1.
The allowable unit stresses for fire-retardant-treated plywood, including fastener values, shall be developed from an approved method of investigation that considers the effects of anticipated temperature and humidity to which the fire-retardant-treated plywood will be subjected, the type of treatment and redrying process. The fire-retardanttreated plywood shall be graded by an approved agency.
The maximum allowable spans for wood structural panel roof sheathing shall not exceed the values set forth in Table 503.2.1.1(1), or APA E30.
Wood structural panel used as roof sheathing shall be installed with joints staggered or not staggered in accordance with Table 602.3(1), or APA E30 for wood roof framing or with Table 804.3 for steel roof framing.
Elements shall be straight and free of any defects that would significantly affect their structural performance. Cold-formed steel roof framing members shall comply with the requirements of this section.
The provisions of this section shall control the construction of cold-formed steel roof framing for buildings not greater than 60 feet (18 288 mm) perpendicular to the joist, rafter or truss span, not greater than 40 feet (12 192 mm) in width parallel to the joist span or truss, less than or equal to three stories above grade plane and with roof slopes not less than 3:12 (25-percent slope) or greater than 12:12 (100 percent slope). Cold-formed steel roof framing constructed in accordance with the provisions of this section shall be limited to sites subjected to a maximum design wind speed of 110 miles per hour (49 m/s), Exposure B or C, and a maximum ground snow load of 70 pounds per square foot (3350 Pa).

Cold-formed steel roof framing constructed in accordance with Section 804 shall be located in line with load-bearing studs in accordance with Figure 804.1.2 and the tolerances specified as follows:

1. The maximum tolerance shall be 3/4 inch (19.1 mm) between the centerline of the horizontal framing member and the centerline of the vertical framing member.

2. Where the centerline of the horizontal framing member and bearing stiffener are located to one side of the center line of the vertical framing member, the maximum tolerance shall be 1/8 inch (3 mm) between the web of the horizontal framing member and the edge of the vertical framing member.

For SI: 1 inch = 25.4 mm.

FIGURE 804.1.2
IN-LINE FRAMING

Load-bearing cold-formed steel roof framing members shall comply with Figure 804.2(1) and with the dimensional and minimum thickness requirements specified in Tables 804.2(1) and 804.2(2). Tracks shall comply with Figure 804.2(2) and shall have a minimum flange width of 11/4 inches (32 mm). The maximum inside bend radius for members shall be the greater of 3/32 inch (2.4 mm) minus half the base steel thickness or 1.5 times the base steel thickness.

TABLE 804.2(1)
LOAD-BEARING COLD-FORMED STEEL MEMBER SIZES

NOMINAL MEMBER SIZE MEMBER DESIGNATIONaWEB DEPTH (inches)MINIMUM FLANGE WIDTH
(inches)
MAXIMUM FLANGE WIDTH
(inches)
MINIMUM LIP SIZE (inches)
350S162-t3.51.62520.5
550S162-t5.51.62520.5
800S162-t81.62520.5
1000S162-t101.62520.5
1200S162-t121.62520.5
For SI: 1 inch = 25.4 mm.
a. The member designation is defined by the first number representing the member depth in hundredths of an inch, the letter “s” representing a stud or joist member, the second number representing the flange width in hundredths of an inch, and the letter “t” shall be a number representing the minimum base metal thickness in mils [see Table 804.2(2)].

TABLE 804.2(2)
MINIMUM THICKNESS OF COLD-FORMED STEEL MEMBERS

DESIGNATION THICKNESS (mils)MINIMUM BASE STEEL THICKNESS (inches)
330.0329
430.0428
540.0538
680.0677
970.0966
For SI: 1 inch = 25.4 mm, 1 mil = 0.0254 mm.

FIGURE 804.2(1)
C-SHAPED SECTION

FIGURE 804.2(2)
TRACK SECTION

Load-bearing cold-formed steel framing members shall be cold-formed to shape from structural quality sheet steel complying with the requirements of one of the following:

1. ASTM A 653: Grades 33 and 50 (Class 1 and 3).

2. ASTM A 792: Grades 33 and 50A.

3. ASTM A 1003: Structural Grades 33 Type H and 50 Type H.

Load-bearing cold-formed steel framing members shall have a legible label, stencil, stamp or embossment with the following information as a minimum:

1. Manufacturer’s identification.

2. Minimum base steel thickness in inches (mm).

3. Minimum coating designation.

4. Minimum yield strength, in kips per square inch (ksi) (MPa).

Load-bearing cold-formed steel framing shall have a metallic coating complying with ASTM A 1003 and one of the following:

1. A minimum of G 60 in accordance with ASTM A 653.

2. A minimum of AZ 50 in accordance with ASTM A 792.

Screws for steel-to-steel connections shall be installed with a minimum edge distance and center-to-center spacing of 1/2 inch (13 mm), shall be self-drilling tapping, and shall conform to ASTM C 1513. Structural sheathing shall be attached to cold-formed steel roof rafters with minimum No. 8 self-drilling tapping screws that conform to ASTM C 1513. Screws for attaching structural sheathing to cold-formed steel roof framing shall have a minimum head diameter of 0.292 inch (7.4 mm) with countersunk heads and shall be installed with a minimum edge distance of 3/8 inch (10 mm). Gypsum board ceilings shall be attached to cold-formed steel joists with minimum No. 6 screws conforming to ASTM C 954 or ASTM C 1513 with a bugle head style and shall be installed in accordance with Section 805. For all connections, screws shall extend through the steel a minimum of three exposed threads. All fasteners shall have rust inhibitive coating suitable for the installation in which they are being used, or be manufactured from material not susceptible to corrosion.

Where No. 8 screws are specified in a steel-to-steel connection, reduction of the required number of screws in the connection is permitted in accordance with the reduction factors in Table 804.2.4 when larger screws are used or when one of the sheets of steel being connected is thicker than 33 mils (0.84 mm). When applying the reduction factor, the resulting number of screws shall be rounded up.

TABLE 804.2.4
SCREW SUBSTITUTION FACTOR

SCREW SIZETHINNEST CONNECTED STEEL SHEET (mils)
3343
#81.00.67
#100.930.62
#120.860.56
For SI: 1 mil = 0.0254 mm.
Web holes, web hole reinforcing, and web hole patching shall be in accordance with this section.

Web holes in roof framing members shall comply with all of the following conditions:

1. Holes shall conform to Figure 804.2.5.1;

2. Holes shall be permitted only along the centerline of the web of the framing member;

3. Center-to-center spacing of holes shall not be less than 24 inches (610 mm);

4. The web hole width shall not be greater than one-half the member depth, or 21/2 inches (64.5 mm);

5. Holes shall have a web hole length not exceeding 41/2 inches (114 mm); and

6. The minimum distance between the edge of the bearing surface and the edge of the web hole shall not be less than 10 inches (254 mm).

Framing members with web holes not conforming to the above requirements shall be reinforced in accordance with Section 804.2.5.2, patched in accordance with Section 804.2.5.3 or designed in accordance with accepted engineering practices.
For SI: 1 inch = 25.4 mm.

FIGURE 804.2.5.1
WEB HOLES

Reinforcement of web holes in ceiling joists not conforming to the requirements of Section 804.2.5.1 shall be permitted if the hole is located fully within the center 40 percent of the span and the depth and length of the hole does not exceed 65 percent of the flat width of the web. The reinforcing shall be a steel plate or C-shape section with a hole that does not exceed the web hole size limitations of Section 804.2.5.1 for the member being reinforced. The steel reinforcing shall be the same thickness as the receiving member and shall extend at least 1 inch (25.4 mm) beyond all edges of the hole. The steel reinforcing shall be fastened to the web of the receiving member with No.8 screws spaced no greater than 1 inch (25.4 mm) center-to-center along the edges of the patch with minimum edge distance of 1 / 2 inch (13 mm).

Patching of web holes in roof framing members not conforming to the requirements in Section 804.2.5.1 shall be permitted in accordance with either of the following methods:

1. Framing members shall be replaced or designed in accordance with accepted engineering practices where web holes exceed the following size limits:

1.1. The depth of the hole, measured across the web, exceeds 70 percent of the flat width of the web; or

1.2. The length of the hole measured along the web, exceeds 10 inches (254 mm) or the depth of the web, whichever is greater.

2. Web holes not exceeding the dimensional requirements in Section 804.2.5.3, Item 1, shall be patched with a solid steel plate, stud section or track section in accordance with Figure 804.2.5.3. The steel patch shall, as a minimum, be the same thickness as the receiving member and shall extend at least 1 inch (25 mm) beyond all edges of the hole. The steel patch shall be fastened to the web of the receiving member with No.8 screws spaced no greater than 1 inch (25 mm) center-to-center along the edges of the patch with minimum edge distance of 1/2 inch (13 mm).

For SI: 1 inch = 25.4 mm.

FIGURE 804.2.5.3
WEB HOLE PATCH

Cold-formed steel roof systems constructed in accordance with the provisions of this section shall consist of both ceiling joists and rafters in accordance with Figure 804.3 and fastened in accordance with Table 804.3, and hip framing in accordance with Section 804.3.3.

TABLE 804.3
ROOF FRAMING FASTENING SCHEDULEa, b

DESCRIPTION OF BUILDING ELEMENTSNUMBER AND SIZE OF FASTENERSSPACING OF FASTENERS
Ceiling joist to top track of load-bearing wall2 No. 10 screwsEach joist
Roof sheathing (oriented strand board or plywood) to raftersNo. 8 screws6″ o.c. on edges and 12″ o.c. at interior supports.
6″ o.c. at gable end truss
Truss to bearing walla2 No. 10 screwsEach truss
Gable end truss to endwall top trackNo. 10 screws12″ o.c.
Rafter to ceiling joistMinimum No. 10 screws, per Table 804.3.1Evenly spaced, not less than 1/2″ from all edges.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479kPa, 1 mil = 0.0254 mm.
a. Screws shall be applied through the flanges of the truss or ceiling joist or a 54 mil clip angle shall be used with two No. 10 screws in each leg. See Section 804.3.9 for additional requirements to resist uplift forces.
b. Spacing of fasteners on roof sheathing panel edges applies to panel edges supported by framing members and at all roof plane perimeters. Blocking of roof sheathing panel edges perpendicular to the framing members shall not be required except at the intersection of adjacent roof planes. Roof perimeter shall be supported by framing members or cold-formed blocking of the same depth and gage as the floor members.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mil = 0.0254 mm.

FIGURE 804.3
STEEL ROOF CONSTRUCTION

Cold-formed steel ceiling joists shall be in accordance with this section.

Ceiling joist size and thickness shall be determined in accordance with the limits set forth in Tables 804.3.1.1(1) through 804.3.1.1(8). When determining the size of ceiling joists, the lateral support of the top flange shall be classified as unbraced, braced at mid-span or braced at third points in accordance with Section 804.3.1.4. Where sheathing material is attached to the top flange of ceiling joists or where the bracing is spaced closer than third point of the joists, the “third point” values from Tables 804.3.1.1(1) through 804.3.1.1(8) shall be used.

Ceiling joists shall have a bearing support length of not less than 11/2 inches (38 mm) and shall be connected to roof rafters (heel joint) with No. 10 screws in accordance with Figures 804.3.1.1(1) and 804.3.1.1(2) and Table 804.3.1.1(9).
When continuous joists are framed across interior bearing supports, the interior bearing supports shall be located within 24 inches (610 mm) of midspan of the ceiling joist, and the individual spans shall not exceed the applicable spans in Tables 804.3.1.1(2), 804.3.1.1(4), 804.3.1.1(6) and 804.3.1.1(8).
When the attic is to be used as an occupied space, the ceiling joists shall be designed in accordance with Section 505.

TABLE 804.3.1.1(1)
CEILING JOIST SPANS
SINGLE SPANS WITH BEARING STIFFENERS
10 lb per sq ft LIVE LOAD (NO ATTIC STORAGE)a, b, c 33 ksi STEEL

MEMBER
DESIGNATION
ALLOWABLE SPAN (feet-inches)
Lateral Support of Top (Compression) Flange
UnbracedMid-Span BracingThird-Point Bracing
Ceiling Joist Spacing (inches)
162416241624
350S162-339'-5″8'-6″12'-2″10'-4″12'-2″10'-7″
350S162-4310'-3″9'-2″12'-10″11'-2″12'-10″11'-2″
350S162-5411'-1″9'-11″13'-9″12'-0″13'-9″12'-0″
350S162-6812'-1″10'-9″14'-8″12'-10″14'-8″12'-10″
350S162-9714'-4″12'-7″16'-4″14'-3″16'-4″14'-3″
550S162-3310'-7″9'-6″14'-10″12'-10″15'-11″13'-4″
550S162-4311'-8″10'-6″16'-4″14'-3″17'-10″15'-3″
550S162-5412'-6″11'-2″17'-7″15'-7″19'-5″16'-10″
550S162-6813'-6″12'-1″19'-2″17'-1″21'-0″18'-4″
550S162-9715'-9″13'-11″21'-8″19'-3″23'-5″20'-5″
800S162-3312'-2″10'-11″17'-8″15'-10″19'-10″17'-1″
800S162-4313'-0″11'-9″18'-10″17'-0″21'-6″19'-1″
800S162-5413'-10″12'-5″20'-0″18'-0″22'-9″20'-4″
800S162-6814'-11″13'-4″21'-3″19'-1″24'-1″21'-8″
800S162-9717'-1″15'-2″23'-10″21'-3″26'-7″23'-10″
1000S162-4313'-11″12'-6″20'-2″18'-3″23'-1″20'-9″
1000S162-5414'-9″13'-3″21'-4″19'-3″24'-4″22'-0″
1000S162-6815'-10″14'-2″22'-8″20'-5″25'-9″23'-2″
1000S162-9718'-0″16'-0″25'-3″22'-7″28'-3″25'-4″
1200S162-4314'-8″13'-3″21'-4″19'-3″24'-5″21'-8″
1200S162-5415'-7″14'-0″22'-6″20'-4″25'-9″23'-2″
1200S162-6816'-8″14'-11″23'-11″21'-6″27'-2″24'-6″
1000S162-9718'-9″16'-9″26'-6″23'-8″29'-9″26'-9″
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa.
a. Deflection criterion: L/240 for total loads.
b. Ceiling dead load = 5 psf.
c. Bearing stiffeners are required at all bearing points and concentrated load locations.

TABLE 804.3.1.1(2)
CEILING JOIST SPANS
TWO EQUAL SPANS WITH BEARING STIFFENERS
10 lb per sq ft LIVE LOAD (NO ATTIC STORAGE)a, b, c 33 ksi STEEL

MEMBER
DESIGNATION
ALLOWABLE SPAN (feet-inches)
Lateral Support of Top (Compression) Flange
UnbracedMid-Span BracingThird-Point Bracing
Ceiling Joist Spacing (inches)
162416241624
350S162-3312'-11″10'-11″13'-5″10'-11″13'-5″10'-11″
350S162-4314'-2″12'-8″15'-10″12'-11″15'-10″12'-11″
350S162-5415'-6″13'-10″17'-1″14'-6″17'-9″14'-6″
350S162-6817'-3″15'-3″18'-6″16'-1″19'-8″16'-1″
350S162-9720'-10″18'-4″21'-5″18'-10″21'-11″18'-10″
550S162-3314'-4″12'-11″16'-7″14'-1″17'-3″14'-1″
550S162-4316'-0″14'-1″17'-11″16'-1″20'-7″16'-10″
550S162-5417'-4″15'-6″19'-5″17'-6″23'-2″19'-0″
550S162-6819'-1″16'-11″20'-10″18'-8″