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// CODE SNIPPET

R802.5.1 Ceiling Joist Size

Georgia State Minimum Standard One and Two Family Dwelling Code > 8 Roof-Ceiling Construction > R802 Wood Roof Framing > R802.5 Ceiling Joists > R802.5.1 Ceiling Joist Size
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Ceiling joists shall be sized based on the joist spans in Tables R802.5.1(1) and R802.5.1(2). For other grades and species and for other loading conditions, refer to the AWC STJR.

TABLE R802.5.1(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#311-116-320-725-2
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#112-519-625-8Note a
Southern pine#211-1018-824-7Note a
Southern pine#310-114-1118-922-9
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#211-317-823-4Note a
Douglas fir-larch#39-714-117-1021-9
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#111-317-823-10Note a
Southern pine#210-916-1121-725-7
Southern pine#38-912-1116-319-9
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#210-716-821-426-0
Douglas fir-larch#38-912-1016-319-10
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#110-716-822-0Note a
Southern pine#210-215-719-823-5
Southern pine#38-011-914-1018-0
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
24Douglas fir-larchSS10-516-421-7Note a
Douglas fir-larch#110-015-920-124-6
Douglas fir-larch#29-1015-019-123-3
Douglas fir-larch#37-1011-614-717-9
Hem-firSS9-1015-620-5Note a
Hem-fir#19-815-219-1024-3
Hem-fir#29-214-518-622-7
Hem-fir#37-811-214-217-4
Southern pineSS10-316-121-2Note a
Southern pine#19-1015-620-524-0
Southern pine#29-313-1117-720-11
Southern pine#37-210-613-316-1
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 = 0.0479 kPa.

  1. Span exceeds 26 feet in length.

TABLE R802.5.1(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#29-1015-019-123-3
Douglas fir-larch#37-1011-614-717-9
Hem-firSS9-1015-620-5Note a
Hem-fir#19-815-219-1024-3
Hem-fir#29-214-518-622-7
Hem-fir#37-811-214-217-4
Southern pineSS10-316-121-2Note a
Southern pine#19-1015-620-524-0
Southern pine#29-313-1117-720-11
Southern pine#37-210-613-316-1
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#28-1113-016-620-2
Douglas fir-larch#36-109-1112-715-5
Hem-firSS8-1114-118-623-8
Hem-fir#18-913-717-221-0
Hem-fir#28-412-816-019-7
Hem-fir#36-89-812-415-0
Southern pineSS9-414-719-324-7
Southern pine#18-1114-017-920-9
Southern pine#28-012-015-318-1
Southern pine#36-29-211-614-0
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-larchSS8-1114-018-523-7
Douglas fir-larch#18-712-615-1019-5
Douglas fir-larch#28-211-1115-118-5
Douglas fir-larch#36-29-111-614-1
Hem-firSS8-513-317-522-3
Hem-fir#18-312-415-819-2
Hem-fir#27-1011-714-817-10
Hem-fir#36-18-1011-313-8
Southern pineSS8-913-918-223-1
Southern pine#18-512-916-218-11
Southern pine#27-411-013-1116-6
Southern pine#35-88-410-612-9
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
24Douglas fir-larchSS8-313-017-221-3
Douglas fir-larch#17-811-214-217-4
Douglas fir-larch#27-310-813-616-5
Douglas fir-larch#35-78-110-312-7
Hem-firSS7-1012-316-220-6
Hem-fir#17-711-114-017-1
Hem-fir#27-110-413-116-0
Hem-fir#35-57-1110-012-3
Southern pineSS8-112-916-1021-6
Southern pine#17-811-514-616-11
Southern pine#26-79-1012-614-9
Southern pine#35-17-59-511-5
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 = 0.0479 kPa.

  1. Span exceeds 26 feet in length.

Related Code Sections


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