CODES

ADOPTS WITH AMENDMENTS:

International Residential Code 2012 (IRC 2012)

Copyright

Preface

Part I ‒ Administrative

Chapter 1 Scope and 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 [Re] Energy Efficiency

Part V ‒ Mechanical

Chapter 12 Mechanical Administration

Chapter 13 General Mechanical System Requirements

Chapter 14 Heating and Cooling Equipment and Appliances

Chapter 15 Exhaust Systems

Chapter 16 Duct Systems

Chapter 17 Combustion Air

Chapter 18 Chimneys and Vents

Chapter 19 Special Appliances, Equipment and Systems

Chapter 20 Boilers and Water Heaters

Chapter 21 Hydronic Piping

Chapter 22 Special Piping and Storage Systems

Chapter 23 Solar Energy Systems

Part VI ‒ Fuel Gas

Chapter 24 Fuel Gas

Part VII ‒ Plumbing

Chapter 25 Plumbing Administration

Chapter 26 General Plumbing Requirements

Chapter 27 Plumbing Fixtures

Chapter 28 Water Heaters

Chapter 29 Water Supply and Distribution

Chapter 30 Sanitary Drainage

Chapter 31 Vents

Chapter 32 Traps

Chapter 33 Storm Drainage

Part VIII Electrical

Chapter 34 General Requirements

Chapter 35 Electrical Definitions

Chapter 36 Services

Chapter 37 Branch Circuit and Feeder Requirements

Chapter 38 Wiring Methods

Chapter 39 Power and Lighting Distribution

Chapter 40 Devices and Luminaires

Chapter 41 Appliance Installation

Chapter 42 Swimming Pools [Electrical Provisions]

Chapter 43 Class 2 Remote-Control, Signaling and Power-Limited Circuits

Chapter 44 High-Velocity Hurricane Zones

Chapter 45 Private Swimming Pools

Part IX ‒ Referenced Standards

Chapter 46 Referenced Standards

Appendix A Sizing and Capacities of Gas Piping

Appendix B Sizing of Venting Systems Serving Appliances Equipped With Draft Hoods, Category I Appliances, and Appliances Listed for Use With Type B Vents

Appendix C Exit Terminals of Mechanical Draft and Direct-Vent Venting Systems

Appendix D Recommended Procedure for Safety Inspection of an Existing Appliance Installation

Appendix E Florida Standard for Mitigation of Radon in Existing Buildings Effective: June 1, 1994

Appendix F Florida Standard for Passive Radon-Resistant New Residential Building Construction

Appendix G Swimming Pools, Spas and Hot Tubs Reserved

Appendix H Patio Covers

Appendix I Private Sewage Disposal

Appendix J Existing Buildings and Structures

Appendix K Sound Transmission

Appendix L Permit Fees

Appendix M Home Day Care—r-3 Occupancy

Appendix N Venting Methods

Appendix O Automatic Vehicular Gates

Appendix P Sizing of Water Piping System

Appendix Q Florida Residential Code Electrical Provisions/National Electrical Code Cross Reference

The provisions of this chapter shall govern the design, materials, construction and quality of roof assemblies.

Exception: Buildings and structures located within the High-Velocity Hurricane Zone shall comply with the provisions of Chapter 44.

Roofs shall be covered with materials as set forth in Sections R904 and R905. Class A, B or C roofing shall be installed in areas designated by law as requiring their use or when the edge of the roof is less than 3 feet (914 mm) from a lot line. Classes A, B and C roofing required by this section to be listed shall be tested in accordance with UL 790 or ASTM E 108.

Exceptions:

1. Class A roof assemblies include those with coverings of brick, masonry and exposed concrete roof deck.

2. Class A roof assemblies also include ferrous or copper shingles or sheets, metal sheets and shingles, clay or concrete roof tile, or slate installed on noncombustible decks.

3. Class A roof assemblies include minimum 16 oz/ft2 copper sheets installed over combustible decks.

Fire-retardant-treated wood shakes and shingles shall be treated by impregnation with chemicals by the full-cell vacuum-pressure process, in accordance with AWPA C1. Each bundle shall be marked to identify the manufactured unit and the manufacturer, and shall also be labeled to identify the classification of the material in accordance with the testing required in Section R902.1, the treating company and the quality control agency.
Roof decks shall be covered with approved roof coverings secured to the building or structure in accordance with the provisions of this chapter. Roof assemblies shall be designed and installed in accordance with this code and the approved manufacturer’s installation instructions such that the roof assembly shall serve to protect the building or structure.
Flashings shall be installed in a manner that prevents moisture from entering the wall and roof through joints in copings, through moisture permeable materials and at intersections with parapet walls and other penetrations through the roof plane.

Flashings shall be installed at wall and roof intersections, wherever there is a change in roof slope or direction and around roof openings. Where flashing is of metal, the metal shall be corrosion resistant with a thickness of not less than provided in Table R903.2.1.

Exception: Flashing is not required at hip and ridge junctions.

TABLE R903.2.1
METAL FLASHING MATERIAL

MATERIALGAGE MINIMUM
THICKNESS
(INCHES)
GAGEWEIGHT
(lbs per sq
ft)
Copper0.0241 (16 oz)
Aluminum0.024
Stainless steel28
Galvanized
steel
0.017926
(zinc coated G90)
26
(zinc coated
G90)
Aluminum
zinc coated
steel
0.017926
(AZ50 alum
zinc)
26
(AZ50
alum zinc)
Zinc alloy0.027
Lead2.5 (40 oz.)
Painted terne1.25 (20 oz.)

A cricket or saddle shall be installed on the ridge side of any chimney or penetration more than 30 inches (762 mm) wide as measured perpendicular to the slope. Cricket or saddle coverings shall be sheet metal or of the same material as the roof covering.

Exception: Unit skylights installed in accordance with Section R308.6 and flashed in accordance with the manufacturer’s instructions shall be permitted to be installed without a cricket or saddle.
All membrane flashing shall be installed according to the roof assembly manufacturer’s published literature.
Parapet walls shall be properly coped with noncombustible, weatherproof materials of a width no less than the thickness of the parapet wall.
Unless roofs are sloped to drain over roof edges, roof drains shall be installed at each low point of the roof. Where required for roof drainage, scuppers shall be placed level with the roof surface in a wall or parapet. The scupper shall be located as determined by the roof slope and contributing roof area.

When other means of drainage of overflow water is not provided, overflow scuppers shall be placed in walls or parapets not less than 2 inches (51 mm) nor more than 4 inches (102 mm) above the finished roof covering and shall be located as close as practical to required vertical leaders or downspouts or wall and parapet scuppers. An overflow scupper shall be sized in accordance with the Florida Building Code, Plumbing.

Overflow drains shall discharge to an approved location and shall not be connected to roof drain lines.
When gutters and leaders are placed on the outside of buildings, the gutters and leaders shall be constructed of metal or approved plastic for outdoor exposure with lapped, soldered or caulked joints and shall be securely fastened to the building with a corrosion-resistant fastening device of similar or compatible material to the gutters and downspouts.
The requirements set forth in this section shall apply to the application of roof covering materials specified herein. Roof assemblies shall be applied in accordance with this chapter and the manufacturer’s installation instructions. Installation of roof assemblies shall comply with the applicable provisions of Section R905.
Roof assemblies shall be of materials that are compatible with each other and with the building or structure to which the materials are applied.
Roof covering materials shall conform to the applicable standards listed in this chapter. In the absence of applicable standards or where materials are of questionable suitability, testing by an approved testing agency shall be required by the building official to determine the character, quality and limitations of application of the materials.
Nails shall be corrosion-resistant nails conforming to ASTM F 1667. The corrosion resistance shall meet ASTM A 641, Class I or an equal corrosion resistance by coating, electro galvanization, mechanical galvanization, hot dipped galvanization, stainless steel, nonferrous metal and alloys or other suitable corrosion-resistant material. Metal or plastic cap nails shall have a head diameter of not less than 1 inch (25.4 mm) with a thickness of at least 32-gauge sheet metal. Metal tin-tabs shall be not less than 15/8 inches (41 mm) and not more than 2 inches (51 mm) in diameter and of not less than 32 gage (0.010 inch) sheet metal in compliance with the corrosion resistance requirements.

Wood screws shall conform to ANSI/ASME B 18.6.1. Screws shall be corrosion resistant by coating, galvanization, stainless steel, nonferrous metal or other suitable corrosion-resistant material. The corrosion resistance shall be demonstrated through one of the following methods:

1. Corrosion resistance equivalent to ASTM A 641, Class 1;

2. Corrosion resistance in accordance with TAS 114, Appendix E;

3. Corrosion-resistant coating exhibiting not more than 5-percent red rust after 1000 hours exposure in accordance with ASTM B 117.

Clips shall be corrosion-resistant clips. The corrosion resistance shall meet 0.90 ounce per square foot (0.458 kg/m2) measured according to ASTM A 90/A 90M, TAS 114 Appendix E or an equal corrosion-resistance coating, electro galvanization, mechanical galvanization, hot dipped galvanization, stainless steel, nonferrous metals and alloys or other suitable corrosion-resistant material. Stainless steel clips shall conform to ASTM A167, Type 304.
Roof covering materials shall be delivered in packages bearing the manufacturer’s identifying marks and approved testing agency labels when required. Bulk shipments of materials shall be accompanied by the same information issued in the form of a certificate or on a bill of lading by the manufacturer.
Roof coverings shall be applied in accordance with the applicable provisions of this section and the manufacturer’s installation instructions. Unless otherwise specified in this section, roof coverings shall be installed to resist the component and cladding loads specified in Table R301.2(2), adjusted for height and exposure in accordance with Table R301.2(3).
The installation of asphalt shingles shall comply with the provisions of this section.
Asphalt shingles shall be fastened to solidly sheathed decks.
Asphalt shingles shall be used only on roof slopes of two units vertical in 12 units horizontal (2:12) or greater. For roof slopes from two units vertical in 12 units horizontal (2:12) and less than four units vertical in 12 units horizontal (4:12), double underlayment application is required in accordance with Section R905.2.7.

Unless otherwise noted, required underlayment shall conform wth ASTM D 226 Type I or Type II, ASTM D 4869 Type II or Type IV, or ASTM D 6757.

Self-adhering polymer modified bitumen sheet shall comply with ASTM D 1970.

Asphalt shingles shall comply with ASTM D 225 or D 3462.

R905.2.4.1 Wind resistance of asphalt shingles.
Asphalt shingles shall be installed in accordance with Sections R905.2.6 and R905.2.6.1. Table R905.2.4.1(1) Classification of Asphalt Roof Shingles per ASTM D 7158.
Reserved. Table R905.2.4.1(2) Classification of Asphalt Shingles per ASTM D 3161.
Reserved.
Fasteners for asphalt shingles shall be galvanized steel, stainless steel, aluminum or copper roofing nails, minimum 12 gage [0.105 inch (3 mm)] shank with a minimum 3/8-inch-diameter (10 mm) head, ASTM F 1667, of a length to penetrate through the roofing materials and a minimum of 3/4 inch (19 mm) into the roof sheathing. Where the roof sheathing is less than 3/4 inch (19 mm) thick, the fasteners shall penetrate through the sheathing. Fasteners shall comply with ASTM F 1667.

Asphalt shingles shall have the minimum number of fasteners required by the manufacturer, but not less than four fasteners per strip shingle or two fasteners per individual shingle. Where the roof slope exceeds 21 units vertical in 12 units horizontal (21:12, 175-percent slope), shingles shall be installed as required by the manufacturer.

R905.2.6.1 Wind resistance of asphalt shingles.
Asphalt Shingles shall be classified in accordance with ASTM D 3161, TAS 107 or ASTM D 7158 to resist the basic wind speed per Figure R301.2(4). Shingles classified as ASTM D 3161 Class D or classified as ASTM D 7158 Class G are acceptable for use in the 100-mph wind zone. Shingles classified as ASTM D 3161 Class F, TAS107 or ASTM D 7158 Class H are acceptable for use in all wind zones. Asphalt shingle wrappers shall indicate compliance with one of the required classifications as shown in Table R905.2.6.1.

TABLE R905.2.6.1
WIND RESISTANCE OF ASPHALT SHINGLES

Classification of Asphalt Shingles
Maximum Basic
Wind Speed, Vult,
From Figure
R301.2(4)
Vasd as
determined in
accordance
with Section
R301.2.1.3
ASTM D 7158ASTM D 3161
11085D, G or H D or F
11690D, G or HD or F
129100G or HD or F
142110G or HF
155120G or HF
168130HF
181140HF
194150HF

Underlayment shall be installed using one of the following methods:

1. For roof slopes from two units vertical in 12 units horizontal (17-percent slope), and less than four units vertical in 12 units horizontal (33-percent slope). Underlayment shall comply with ASTM D 226, Type I or Type II or ASTM D 4869, Type II or Type IV or ASTM D 6757 and shall be two layers applied in the following manner. Apply a 19-inch (483 mm) strip of underlayment felt parallel to and starting at the eaves, fastened sufficiently to hold in place. Starting at the eave, apply 36-inch-wide (914 mm) sheets of underlayment, overlapping successive sheets 19 inches (483 mm), and fastened with a 1-inch (25 mm) round plastic cap, metal cap nails or nails and tin-tabs attached to a nailable deck with one row in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c., and one row at the overlaps fastened 6 inches (152 mm) o.c. Synthetic underlayment shall be fastened in accordance with this section and the manufacturer’s recommendations.

2. For roof slopes of four units vertical in 12 units horizontal (33-percent slope) or greater. Underlayment shall comply with ASTM D 226, Type II or ASTM D 4869, Type IV or ASTM D 6757 and shall be one layer applied in the following manner. Underlayment shall be applied shingle fashion, parallel to and starting from the eave and lapped 2 inches (51 mm), fastened with 1-inch (25 mm) round plastic cap, metal cap nails or nails and tin-tabs attached to a nailable deck with two staggered rows in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c., and one row at the overlaps fastened 6 inches (152 mm) o.c. Synthetic underlayment shall be fastened in accordance with this section and the manufacturer’s recommendations End laps shall be offset by 6 feet (1829 mm).

3. As an alternative, the entire roof deck shall be covered with an approved self-adhering polymer modified bitumen sheet meeting ASTM D 1970 or an approved self-adhering synthetic underlayment installed in accordance with the manufacturer’s installation instructions.

R905.2.7.1 Ice barrier.
Reserved. R905.2.7.2 Underlayment and high winds.
Reserved.

Flashing for asphalt shingles shall comply with this section.

R905.2.8.1 Base and counter flashing.
Base and counter flashing shall be installed as follows:

1. In accordance with manufacturer’s installation instructions, or

2. A continuous metal minimum 4-inch by 4-inch (102 mm by 102 mm) “L” flashing shall be set in approved flashing cement and set flush to the base of the wall and over the underlayment. Both horizontal and vertical metal flanges shall be fastened 6 inches (152 mm) on center with approved fasteners. All laps shall be a minimum of 4 inches (102 mm) fully sealed in approved flashing cement. Flashing shall start at the lower portion of the roof to ensure water-shedding capabilities of all metal laps. The entire edge of the horizontal flange shall be sealed covering all nail penetrations with approved flashing cement and membrane. Shingles shall overlap the horizontal flange and shall be set in approved flashing cement.

Base flashing shall be of either corrosion-resistant metal provided in Section R905.2.8.1 or mineral surface roll roofing weighing a minimum of 77 pounds per 100 square feet (3.76 kg/m2). Counter flashing shall be corrosion-resistant metal with a minimum thickness provided in Table R903.2.1.
R905.2.8.2 Valleys.
Valley linings shall be installed in accordance with the manufacturer’s installation instructions before applying shingles. Valley linings of the following types shall be permitted:

1. For open valleys (valley lining exposed) lined with metal, the valley lining shall be at least 16 inches (406 mm) wide and of any of the corrosion-resistant metals in Table R903.2.1.

2. For open valleys, valley lining of two plies of mineral surfaced roll roofing, complying with ASTM D 3909 or ASTM D 6380 Class M, shall be permitted. The bottom layer shall be 18 inches (457 mm) and the top layer a minimum of 36 inches (914 mm) wide.

3. For closed valleys (valley covered with shingles), valley lining of one ply of smooth roll roofing complying with ASTM D 6380 Class S and at least 36 inches wide (914 mm) or valley lining as described in Item 1 or 2 above shall be permitted. Self-adhering polymer modified bitumen underlayment complying with ASTM D 1970 shall be permitted in lieu of the lining material.

Table R905.2.8.2 Valley Lining Material.
Reserved. R905.2.8.3 Sidewall flashing.
Flashing against a vertical sidewall shall be by the step-flashing method or continuous “L” flashing method. R905.2.8.4 Other flashing.
Flashing against a vertical front wall, as well as soil stack, vent pipe and chimney flashing, shall be applied according to the asphalt shingle manufacturer’s printed instructions. R905.2.8.5 Drip edge.
Provide drip edge at eaves and gables of shingle roofs. The overlap is to be a minimum of 3 inches (76 mm). Eave drip edges shall extend 1/2 inch (13 mm) below sheathing and extend back on the roof a minimum of 2 inches (51 mm). Drip edge at eaves shall be permitted to be installed either over or under the underlayment. If installed over the underlayment, there shall be a minimum 4 inch (51 mm) width of roof cement installed over the drip edge flange. Drip edge shall be mechanically fastened a maximum of 12 inches (305 mm) on center. Where the Vasd as determined in accordance with Section R301.2.1.3 is 110 mph (177 km/h) or greater or the mean roof height exceeds 33 feet (10 058 mm), drip edges shall be mechanically fastened a maximum of 4 inches (102 mm) on center.
The installation of clay and concrete tile shall be in accordance with the manufacturer’s installation instructions, or recommendations of FRSA/TRI Florida High Wind Concrete and Clay Roof Tile Installation Manual, Fifth Edition where the Vasd is determined in accordance with Section R301.2.1.3 or the recommendations of RAS 118, 119 or 120.
Concrete and clay tile shall be installed only over solid sheathing, except where the roof covering is specifically designed and tested in accordance with Chapter 16, Florida Building Code, Building to be applied over spaced structural sheathing boards.
Clay and concrete roof tile shall be installed on roof slopes in accordance with the recommendations of FRSA/TRI Florida High Wind Concrete and Clay Roof Tile Installation Manual, Fifth Edition where the Vasd is determined in accordance with Section R301.2.1.3 or the recommendations of RAS 118, 119 or 120.

Required underlayment shall conform with ASTM D 226, Type II; ASTM D 2626, Type II; or ASTM D 1970 or ASTM D 6380, Class M mineral surfaced roll roofing and shall be installed in accordance with FRSA/TRI Florida High Wind Concrete and Clay Roof Tile Installation Manual, Fifth Edition where the Vasd is determined in accordance with Section R301.2.1.3 or the recommendations of RAS 118, 119 or 120.

R905.3.3.1 Slope and underlayment requirements.
Refer to FRSA/TRI Florida High Wind Concrete and Clay Roof Tile Installation Manual, Fifth Edition where the Vasd is determined in accordance with Section R301.2.1.3 or RAS 118, 119 or 120 for underlayment and slope requirements for specific roof tile systems. R905.3.3.2 High slope roofs.
Reserved. R905.3.3.3 Underlayment and high winds.
Reserved.
Clay roof tile shall comply with ASTM C 1167.
Concrete roof tile shall comply with ASTM C 1492.
Nails shall be corrosion resistant and not less than 11 gage, 5/16-inch (11 mm) head, and of sufficient length to penetrate the deck a minimum of 3/4 inch (19 mm) or through the thickness of the deck, whichever is less, or in accordance with the FRSA/TRI Florida High Wind Concrete and Clay Roof Tile Installation Manual, Fifth Edition where the Vasd is determined in accordance with Section R301.2.1.3 or in accordance with the recommendations of RAS 118, 119 or 120. Attaching wire for clay or concrete tile shall not be smaller than 0.083 inch (2.1 mm).

Tile shall be applied in accordance with this chapter and the manufacturer’s installation instructions, or recommendations of the FRSA/TRI Florida High Wind Concrete and Clay Roof Tile Installation Manual, Fifth Edition based on the following:

Attachment. Clay and concrete roof tiles shall be fastened in accordance with FRSA/TRI Florida High Wind Concrete and Clay Roof Tile Installation Manual, Fifth Edition where the Vasd is determined in accordance with Section R301.2.1.3.
Table R905.3.7 Clay and Concrete Tile Attachment.
Reserved. R905.3.7.1 Hip and ridge tiles.
Hip and ridge tiles shall be installed in accordance with FRSA/TRI Florida High Wind Concrete and Clay Roof Tile Installation Manual, Fifth Edition where the Vasd is determined in accordance with Section R301.2.1.3.
At the juncture of roof vertical surfaces, flashing and counterflashing shall be provided in accordance with this chapter and the manufacturer’s installation instructions or recommendations of the FRSA/TRI Florida High Wind Concrete and Clay Roof Tile Installation Manual, Fifth Edition where the Vasd is determined in accordance with Section R301.2.1.3 or the recommendations of RAS 118, 119 or 120.
The installation of metal roof shingles shall comply with the provisions of this section.
Metal roof shingles shall be applied to a solid or closely fitted deck, except where the roof covering is specifically designed to be applied to spaced sheathing.
Metal roof shingles shall not be installed on roof slopes below three units vertical in 12 units horizontal (25-percent slope).

Underlayment shall comply with ASTM D 226, Type I or Type II, ASTM D 4869. Type II or Type IV or ASTM D 1970 or ASTM D 6757.

R905.4.3.1 Ice barrier.
Reserved. R905.4.3.2 Underlayment and high winds.
Reserved. R905.4.3.3 Underlayment application.
Underlayment shall be installed using one of the following methods:

1. Two layer underlayment shall comply with ASTM D 226, Type I or Type II or ASTM D 4869, Type II or Type IV or ASTM D 6757: Apply a 19-inch (483 mm) strip of underlayment felt parallel to and starting at the eaves, fastened sufficiently to hold in place. Starting at the eave, apply 36-inch-wide (914 mm) sheets of underlayment, overlapping successive sheets 19 inches (483 mm), and fastened with 1-inch (25 mm) round plastic cap, metal cap nails or nails and tintabs attached to a nailable deck with one row in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c., and one row at the overlaps fastened 6 inches (152 mm) o.c. Synthetic underlayment shall be fastened in accordance with this section and the manufacturer’s recommendations.

2. One layer underlayment shall comply with ASTM D 226, Type II or ASTM D 4869, Type IV or ASTM D 6757: Underlayment shall be applied shingle fashion, parallel to and starting from the eave and lapped 2 inches (51 mm), fastened with 1-inch (25 mm) round plastic cap, metal cap nails or nails and tin-tabs attached to a nailable deck with two staggered rows in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c, and one row at the overlaps fastened 6 inches (152 mm) o.c. Synthetic underlayment shall be fastened in accordance with this section and the manufacturer’s recommendations End laps shall be offset by 6 feet (1829 mm).

3. As an alternative, the entire roof deck shall be covered with an approved self-adhering polymer modified bitumen sheet meeting ASTM D 1970 or an approved self-adhering synthetic underlayment installed in accordance with the manufacturer’s installation instructions.

Metal roof shingle roof coverings shall comply with Table R905.4.4. The materials used for metal roof shingle roof coverings shall be naturally corrosion resistant or provided with corrosion resistance in accordance with the standards and minimum thicknesses specified in the standards listed in Table R905.4.4.

TABLE 905.4.4
METAL ROOF COVERINGS

ROOF COVERING TYPESTANDARDSTANDARD APPLICATION RATE/THICKNESS
AluminumASTM B 2090.024-inch minimum thickness for roll-formed panels and 0.019-inch minimum thickness
for press-formed shingles
Aluminum-zinc coated
steel
ASTM A 7920.013-inch minimum thickness, AZ 50 (coated minimum application rate)
Cold-rolled copperASTM B 370Minimum 16 oz./sq. ft. and 12 oz./sq. ft. high yield copper for metal-sheet roof covering systems:
12 oz./sq. ft. for preformed metal shingle systems
CopperASTM B 37016 oz./sq. ft. for metal-sheet roof-covering systems; 12 oz./sq. ft. for preformed metal
shingle systems.
Galvanized steelASTM A 6530.013-inch minimum thickness, G-90 zinc-coateda
Hard lead2 lbs./sq. ft.
Lead-coated copperASTM B 101
Prepainted steelASTM A 7550.0142 inch minimum thickness
Soft lead3 lbs./sq. ft.
Stainless steelASTM A 240300 Series alloys
SteelASTM A 924/
ASTM A 924M
Terne and terne-coated
stainless
Terne coating of 40 lbs. per double base box, field painted where applicable in accordance
with manufacturer’s installation instructions
Zinc0.027 inch minimum thickness; 99.995% electrolytic high grade zinc with alloy additives of
copper (0.08% – 0.20%), titanium (0.07% – 0.12%) and aluminum (0.015%)
For SI: 1 ounce per square foot = 0.0026 kg/m2, 1 pound per square foot = 4.882 kg/m2, 1 inch = 25.4 mm, 1 pound = 0.454 kg.
a. For Group U buildings, the minimum coating thickness for ASTM A 653 galvanized steel roofing shall be G.
Metal roof shingles shall be installed in accordance with the approved manufacturer’s installation instructions. The product approval shall state the allowable uplift resistance for the attachment system. The installation of metal roof shingles shall be limited to roofs where the allowable uplift resistance is equal to or greater than the design uplift pressure for the roof listed in Table R301.2(2).
Roof valley flashing shall be of corrosion-resistant metal of the same material as the roof covering or shall comply with the standards in Table R905.4.4. Valley flashing shall extend at least 8 inches (203 mm) from the centerline each way and shall have a splash diverter rib not less than 3/4 inch (19 mm) high at the flow line formed as part of the flashing. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). The metal valley flashing shall have a 36-inch-wide (914 mm) underlayment directly under it consisting of one layer of underlayment running the full length of the valley, in addition to underlayment required for metal roof shingles.
The installation of mineral-surfaced roll roofing shall comply with this section.
Mineral-surfaced roll roofing shall be fastened to solidly sheathed roofs.
Mineral-surfaced roll roofing shall not be applied on roof slopes below one unit vertical in 12 units horizontal (8-percent slope).

Underlayment shall comply with ASTM D 226, Type I or Type II or ASTM D 4869, Type II or Type IV or ASTM D 1970 or ASTM D 6757.

R905.5.3.1 Ice barrier.
Reserved. R905.5.3.2 Underlayment and high winds.
Reserved. R905.5.3.3 Underlayment application.
Underlayment shall be installed using one of the following methods:

1. Two layer underlayment shall comply with ASTM D 226, Type I or Type II or ASTM D 4869, Type II or Type IV or ASTM D 6757: Apply a 19-inch (483 mm) strip of underlayment felt parallel to and starting at the eaves, fastened sufficiently to hold in place. Starting at the eave, apply 36-inch-wide (914 mm) sheets of underlayment, overlapping successive sheets 19 inches (483 mm), and fastened with 1-inch (25 mm) round plastic cap, metal cap nails or nails and tin-tabs attached to a nailable deck with one row in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c, and one row at the overlaps fastened 6 inches (152 mm) o.c. Synthetic underlayment shall be fastened in accordance with this section and the manufacturer’s recommendations.

2. One layer underlayment shall comply with ASTM D 226, Type II or ASTM D 4869, Type IV or ASTM D 6757: Underlayment shall be applied shingle fashion, parallel to and starting from the eave and lapped 2 inches (51 mm), fastened with 1-inch (25 mm) round plastic cap, metal cap nails or nails and tin-tabs attached to a nailable deck with two staggered rows in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c, and one row at the overlaps fastened 6 inches (152 mm) o.c. Synthetic underlayment shall be fastened in accordance with this section and the manufacturer’s recommendations End laps shall be offset by 6 feet (1829 mm).

3. As an alternative, the entire roof deck shall be covered with an approved self-adhering polymer modified bitumen sheet meeting ASTM D 1970 or an approved self-adhering synthetic underlayment installed in accordance with the manufacturer’s installation instructions.

Mineral-surfaced roll roofing shall conform to ASTM D 3909 or ASTM D 6380, Class M or Class WS.
Mineral-surfaced roll roofing shall be installed in accordance with this chapter and the manufacturer’s installation instructions.
The installation of slate and slate-type shingles shall comply with the provisions of this section.
Slate shingles shall be fastened to solidly sheathed roofs.
Slate shingles shall be used only on slopes of four units vertical in 12 units horizontal (33-percent slope) or greater.

Underlayment shall comply with ASTM D 226, Type I or Type II or ASTM D 4869, Type II or Type IV or ASTM D 1970 or ASTM D 6757. Underlayment shall be installed in accordance with the manufacturer’s installation instructions.

R905.6.3.1 Ice barrier.
Reserved. R905.6.3.2 Underlayment and high winds.
Reserved. R905.6.3.3 Underlayment application.
Underlayment shall be installed using one of the following methods:

1. Two layer underlayment shall comply with ASTM D 226, Type I or Type II or ASTM D 4869, Type II or Type IV or ASTM D 6757: Apply a 19-inch (483 mm) strip of underlayment felt parallel to and starting at the eaves, fastened sufficiently to hold in place. Starting at the eave, apply 36-inch-wide (914 mm) sheets of underlayment, overlapping successive sheets 19 inches (483 mm), and fastened with 1-inch (25 mm) round plastic cap, metal cap nails or nails and tintabs attached to a nailable deck with one row in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c., and one row at the overlaps fastened 6 inches (152 mm) o.c. Synthetic underlayment shall be fastened in accordance with this section and the manufacturer’s recommendations.

2. One layer underlayment shall comply with ASTM D 226, Type II or ASTM D 4869, Type IV or ASTM D 6757: Underlayment shall be applied shingle fashion, parallel to and starting from the eave and lapped 2 inches (51 mm), fastened with 1-inch (25 mm) round plastic cap, metal cap nails or nails and tin-tabs attached to a nailable deck with two staggered rows in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c., and one row at the overlaps fastened 6 inches (152 mm) o.c. Synthetic underlayment shall be fastened in accordance with this section and the manufacturer’s recommendations. End laps shall be offset by 6 feet (1829 mm).

3. As an alternative, the entire roof deck shall be covered with an approved self-adhering polymer modified bitumen sheet meeting ASTM D 1970 or an approved self-adhering synthetic underlayment installed in accordance with the manufacturer’s installation instructions.

Slate shingles shall comply with ASTM C 406.

Minimum headlap for slate shingles shall be in accordance with Table R905.6.5. Slate shingles shall be secured to the roof with two fasteners per slate. Slate shingles shall be installed in accordance with this chapter and the manufacturer’s installation instructions.

TABLE R905.6.5
SLATE SHINGLE HEADLAP

SLOPEHEADLAP (inches)
4:12 ≤ slope < 8:124
8:12 ≤ slope < 20:123
Slope ≤ 20:122
For SI: 1 inch = 25.4 mm.
Flashing and counterflashing shall be made with sheet metal. Valley flashing shall be a minimum of 16 inches (406 mm) wide. Valley and flashing metal shall be a minimum thickness, as provided in Table R903.2.1, for nonferrous metal or stainless steel. Chimneys, stucco or brick walls shall have a minimum of two plies of felt for a cap flashing consisting of a 4-inch-wide (102 mm) strip of felt set in plastic cement and extending 1 inch (25 mm) above the first felt and a top coating of plastic cement. The felt shall extend over the base flashing 2 inches (51 mm).
Slate and slate-type shingles shall be installed in accordance with this chapter and the manufacturer’s installation instructions. The product approval shall state the allowable uplift resistance for the attachment system. The installation of slate and slate-type shingles shall be limited to roofs where the allowable uplift resistance is equal to or greater than the design uplift pressure for the roof listed in Table R301.2(2).
The installation of wood shingles shall comply with the provisions of this section.

Wood shingles shall be installed on solid or spaced sheathing. Where spaced sheathing is used, sheathing boards shall not be less than 1-inch by 4-inch (25.4 mm by 102 mm) nominal dimensions and shall be spaced on centers equal to the weather exposure to coincide with the placement of fasteners.

R905.7.1.1 Solid sheathing required.
Reserved.
Wood shingles shall be installed on slopes of three units vertical in 12 units horizontal (25-percent slope) or greater.

Underlayment shall comply with ASTM D 226, Type I or ASTM D 4869, Type I or II.

R905.7.3.1 Ice barrier.
Reserved. R905.7.3.2 Underlayment and high winds.
Reserved. R905.7.3.3 Underlayment application.
Underlayment shall be installed using one of the following methods:

1. Two layer underlayment shall comply with ASTM D 226, Type I or Type II or ASTM D 4869, Type II or Type IV: Apply a 19-inch (483 mm) strip of underlayment felt parallel to and starting at the eaves, fastened sufficiently to hold in place. Starting at the eave, apply 36-inch-wide (914 mm) sheets of underlayment, overlapping successive sheets 19 inches (483 mm), and fastened with 1-inch (25 mm) round plastic cap, metal cap nails or nails and tin-tabs attached to a nailable deck with one row in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c., and one row at the overlaps fastened 6 inches (152 mm) o.c.

2. One layer underlayment shall comply with ASTM D 226, Type II or ASTM D 4869, Type IV: Underlayment shall be applied shingle fashion, parallel to and starting from the eave and lapped 2 inches (51 mm), fastened with 1-inch (25 mm) round plastic cap, metal cap nails or nails and tin-tabs attached to a nailable deck with two staggered rows in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c., and one row at the overlaps fastened 6 inches (152 mm) o.c. End laps shall be offset by 6 feet (1829 mm).

Wood shingles shall be of naturally durable wood and comply with the requirements of Table R905.7.4.

TABLE R905.7.4
WOOD SHINGLE MATERIAL REQUIREMENTS

MATERIALMINIMUM GRADESAPPLICABLE
GRADING RULES
Wood shingles of
naturally durable wood
1, 2 or 3Cedar Shake and
Shingle Bureau

Wood shingles shall be installed according to this chapter and the manufacturer’s installation instructions. Attachment in accordance with Table R905.7.5 shall be used for roofs with a mean roof height of 40 feet (12 192 mm) or less and in regions with a Vasd as determined in accordance with Section R301.2.1.3 to be 100 mph (44.7 m/s) or less.

TABLE R905.7.5
WOOD SHINGLE AND SHAKE INSTALLATION

ROOF ITEMWOOD SHINGLESWOOD SHAKES
1. Deck
Requirements
Shingles shall be applied to roofs with solid or
spaced sheathing. Where spaced sheathing is used,
sheathing boards shall not be 4 less than 1“ × 4“
nominal dimensions and shall be spaced on center
equal to the weather exposure to coincide with the
placement of fasteners.
Shakes shall be applied to roofs with solid or spaced
sheathing. Where spaced sheathing is used, sheathing
boards shall not be less than 1“ × 4“ nominal dimensions
and shall be spaced on center equal to the weather exposure to
coincide with the placement of fasteners.
When 1“ × 4“ spaced sheathing is installed at 10 inches,
boards must be installed between the sheathing boards.
2. InterlaymentNo requirements.Interlayment shall comply with ASTM D 226, Type 1.
3. UnderlaymentUnderlayment shall comply with ASTM D 226,
Type 1.
No requirements.
4. Application
AttachmentFasteners for wood shingles shall be corrosion
resistant with a minimum penetration of 3/4 inch into
the sheathing. For sheathing less than 1/2 inch thick,
the fasteners shall extend through the sheathing a
minimum of 3/8 inch.
Fasteners for wood shakes shall be corrosion resistant
with a minimum penetration of 3/4 inch into the
sheathing. For sheathing less than 1/2 inch thick, the
fasteners shall extend through the sheathing a minimum
of 3/8 inch.
No. of fastenersWood shingles shall be attached to the roof with two
fasteners per shingle, positioned no more than 3/4
inch (19.1 mm) from each edge and no more than
11/2 inches (38.1 mm) above the exposure line.
Wood shakes shall be attached to the roof with two
fasteners per shake, positioned no more than 1 inch
(25.4 mm) from each edge and no more than 11/2 inches
(38.1 mm) above the exposure line
For SI: 1 inch = 25.4 mm.

Wood shingles installed in accordance with Table R905.7.5 and the requirements of R905.7.6 have an allowable uplift resistance of 45 psf. The installation of wood shingles shall be limited to roofs where the allowable uplift resistance is equal to or greater than the design uplift pressure for the roof listed in Table R301.2(2).

R905.7.6.1 Fasteners. R905.7.6.1.1 Nails.
Nails to attach the wood shakes shall be 3d stainless-steel ring-shank nails. The nails shall have sufficient length to penetrate through the wood shakes and shall penetrate through the sheathing. R905.7.6.1.2 Screws.
Screws to attach the battens to the framing shall be No. 8 by 21/2 inches (64 mm) long corrosion resistant wood screws. Wood screws shall be corrosion resistant screws conforming to ANSI/ASME B18.6.1. The corrosion resistance shall meet ASTM A 641, Class 1 or an equal corrosion resistance by coating, electrogalvanization, mechanical galvanization, stainless steel, nonferrous metal or other suitable corrosion-resistant material. R905.7.6.1.3 Wood battens.
1 × 4 wood battens shall be attached to the wood joists with 2 screws per joist. The first batten shall be located 6 inches (152 mm) from the outer edge of the wood joist. Second batten shall be spaced 11/4 inches (32 mm) from the first batten. The remaining battens shall be spaced a maximum 2 inches (51 mm) apart, except the last one which shall be spaced no greater than 3/4 inches (19 mm) from the previous batten. R905.7.6.1.4 Shingles.
Shingles shall be attached to the battens with 2 nails for each shingle placed 11/2 inches (38 mm) above the exposure line. The nails shall be 3/4 to 1 inch (19 to 25 mm) from the shingle edges.

Wood shingles shall be installed according to this chapter and the manufacturer’s installation instructions. Weather exposure for wood shingles shall not exceed those set in Table R905.7.7.

TABLE R905.7.7
WOOD SHINGLE WEATHER EXPOSURE AND ROOF SLOPE

ROOFING
MATERIAL
LENGTH
(inches)
GRADEEXPOSURE (inches)
3:12 pitch to
< 4:12
4:12 pitch or
steeper
Shingles of
naturally durable
wood
16No. 133/45
No. 231/24
No. 3331/2
18No. 141/451/2
No. 2441/2
No. 331/24
24No. 153/471/2
No. 251/261/2
No. 3551/2
For SI: 1 inch = 25.4 mm.

At the juncture of the roof and vertical surfaces, flashing and counter flashing shall be provided in accordance with the manufacturer’s installation instructions, and where of metal, shall not be less than 0.017-inch (0.48 mm) (No. 26 galvanized sheet gage) corrosion-resistant metal.

R905.7.8.1 Valley flashing.
Roof flashing shall be not less than No. 26 gage [0.017 inches (0.48 mm)] corrosion-resistant sheet metal and shall extend 10 inches (254 mm) from the centerline each way for roofs having slopes less than 12 units vertical in 12 units horizontal (100-percent slope), and 7 inches (178 mm) from the centerline each way for slopes of 12 units vertical in 12 units horizontal and greater. Sections of flashing shall have an end lap of not less than 4 inches (102 mm).
Each bundle of shingles shall be identified by a label of an approved grading or inspection bureau or agency.
The installation of wood shakes shall comply with the provisions of this section.

Wood shakes shall be used only on solid or spaced sheathing. Where spaced sheathing is used, sheathing boards shall not be less than 1-inch by 4-inch (25 mm by 102 mm) nominal dimensions and shall be spaced on centers equal to the weather exposure to coincide with the placement of fasteners. Where 1-inch by 4-inch (25 mm by 102 mm) spaced sheathing is installed at 10 inches (254 mm) on center, additional 1-inch by 4-inch (25 mm by 102 mm) boards shall be installed between the sheathing boards.

R905.8.1.1 Solid sheathing required.
Reserved.
Wood shakes shall only be used on slopes of 4 units vertical in 12 units horizontal (33-percent slope) or greater.

Underlayment shall comply with ASTM D 226, Type I or Type II or ASTM D 4869, Type II or Type IV.

R905.8.3.1 Ice barrier.
Reserved. R905.8.3.2 Underlayment and high winds.
Reserved. R905.8.3.3 Underlayment application.
Underlayment shall be installed using one of the following methods:

1. Two layer underlayment shall comply with ASTM D 226, Type I or Type II or ASTM D 4869, Type II or Type IV: Apply a 19-inch (483 mm) strip of underlayment felt parallel to and starting at the eaves, fastened sufficiently to hold in place. Starting at the eave, apply 36-inch-wide (914 mm) sheets of underlayment, overlapping successive sheets 19 inches (483 mm), and fastened with 1-inch (25 mm) round plastic cap, metal cap nails or nails and tin-tabs attached to a nailable deck with one row in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c., and one row at the overlaps fastened 6 inches (152 mm) o.c.

2. One layer underlayment shall comply with ASTM D 226, Type II or ASTM D 4869, Type IV: Underlayment shall be applied shingle fashion, parallel to and starting from the eave and lapped 2 inches (51 mm), fastened with 1-inch (25 mm) round plastic cap, metal cap nails or nails and tin-tabs attached to a nailable deck with two staggered rows in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c, and one row at the overlaps fastened 6 inches (152 mm) o.c. End laps shall be offset by 6 feet (1829 mm).

R905.8.3.4 Interlayment.
Interlayment shall comply with ASTM D 226, Type I.
Attachment in accordance with Table R905.7.5 shall be used for roofs with a mean roof height of 40 feet (12 192 mm) or less and in regions with a Vasd, as determined in accordance with Section R301.2.1.3, of 100 mph (44.7 m/s) or less.

Wood shakes shall comply with the requirements of Table R905.8.5.

TABLE R905.8.5
WOOD SHAKE MATERIAL REQUIREMENTS

MATERIALMINIMUM
GRADES
APPLICABLE
GRADING RULES
Wood shakes of naturally durable
wood
1Cedar Shake and
Shingle Bureau
Taper sawn shakes of naturally
durable wood
1 or 2Cedar Shake and
Shingle Bureau
Preservative-treated shakes and
shingles of naturally durable wood
1Cedar Shake and
Shingle Bureau
Fire-retardant-treated shakes and
shingles of naturally durable wood
1Cedar Shake and
Shingle Bureau
Preservative-treated taper sawn
shakes of Southern pine treated in
accordance with AWPA Standard
U1 (Commodity Specification A,
Use Category 3B and Section 5.6)
1 or 2Forest Products
Laboratory of the
Texas Forest
Services

Reserved.

Table R905.8.6 Wood Shake Weather Exposure and Roof Slope.
Reserved.

Wood shakes installed in accordance with Table R905.7.5 and the requirements of Section R905.8.7 have an allowable uplift resistance of 90 psf. The installation of wood shakes shall be limited to roofs where the allowable uplift resistance is equal to or greater than the design uplift pressure for the roof listed in Table R301.2(2).

R905.8.7.1 Fasteners. R905.8.7.1.1 Nails.
Nails to attach the wood shakes shall be 6d stainless-steel ring-shank nails. The nails shall have sufficient length to penetrate through the wood shakes and shall penetrate through the sheathing. R905.8.7.1.2 Screws.
Screws to attach the battens to the framing shall be No. 8 by 21/2 inches (64 min) long corrosion-resistant wood screws. Wood screws shall be corrosion-resistant screws conforming to ANSI/ASME B18.6.1. The corrosion resistance shall meet ASTM A641, Class 1 or an equal corrosion resistance by coating, electrogalvanization, mechanical galvanization, stainless steel, nonferrous metal or other suitable corrosion-resistant material. R905.8.7.1.3 Wood battens.
1 x 6 wood battens shall be attached to the wood joists with 2 screws per joist. The first batten shall be located 6 inches (152 mm) from the outer edge of the wood joist. The second batten shall be spaced 11/4 inches (32 mm) from the first batten. The remaining battens shall be spaced a maximum 2 inches (51 mm) apart, except the last one, which shall be spaced no greater than 3/4 inches (19 mm) from the previous batten. R905.8.7.1.4 Shakes.
Shakes shall be attached to the battens with 2 nails for each shake placed 11/2 inches (38 mm) above the exposure line. The nails shall be 3/4 to 1 inch (19 mm to 25 mm) from the shake edges.

Wood shakes shall be laid with a side lap not less than 11/2 inches (38 mm) between joints in adjacent courses. Spacing between shakes in the same course shall be 3/8 to 5/8 inches (9.5 to 15.9 mm) for shakes and taper sawn shakes of naturally durable wood and shall be 1/4 to 3/8 inch (6.4 to 9.5 mm) for preservative taper sawn shakes. Weather exposure for wood shakes shall not exceed those set in Table R905.8.8.

TABLE R905.8.8
WOOD SHAKE WEATHER EXPOSURE AND ROOF SLOPE

ROOFING MATERIALLENGTH
(inches)
GRADEEXPOSURE
(inches)
4:12 pitch or
steeper
Shakes of naturally durable
wood
18No. 171/2
24No. 110a
Preservative-treated taper
sawn shakes of Southern
Yellow Pine
18No. 171/2
24No. 110
18No. 251/2
24No. 271/2
Taper-sawn shakes of
naturally durable wood
18No. 171/2
24No. 110
18No. 251/2
24No. 271/2
For SI: 1 inch = 25.4 mm.
a. For 24-inch by 3/8-inch handsplit shakes, the maximum exposure is 71/2 inches.
Each bundle of shakes shall be identified by a label of an approved grading or inspection bureau or agency.

At the juncture of the roof and vertical surfaces, flashing and counter flashing shall be provided in accordance with the manufacturer’s installation instructions, and where of metal, shall not be less than 0.017-inch (0.48 mm) (No. 26 galvanized sheet gage) corrosion-resistant metal.

R905.8.10.1 Valley flashing.
Valley flashing shall extend at least 11 inches (279 mm) from the centerline each way and have a splash diverter rib not less than 1 inch (25 mm) high at the flow line formed as part of the flashing. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). For roof slopes of 4 units vertical in 12 units horizontal (33-percent slope) and over, the valley flashing shall have a 36-inch-wide (914 mm) underlayment of one layer of ASTM D 226, Type I underlayment running the full length of the valley, in addition to other required underlayment per Table R903.2.1. Valley flashing and flashing metal shall be a minimum thickness as provided in Table R903.2.1 for nonferrous metal or stainless steel.
The installation of built-up roofs shall comply with the provisions of this section.
Built-up roofs shall have a design slope of a minimum of one-fourth unit vertical in 12 units horizontal (2-percent slope) for drainage, except for coal-tar built-up roofs, which shall have a design slope of a minimum one-eighth unit vertical in 12 units horizontal (1-percent slope).

Built-up roof covering materials shall comply with the standards in Table R905.9.2 or UL 55A.

TABLE R905.9.2
BUILT-UP ROOFING MATERIAL STANDARDS

MATERIAL STANDARDSTANDARD
Acrylic coatings used in roofingASTM D 6083
Aggregate surfacingASTM D 1863
Asphalt adhesive used in roofingASTM D 3747
Asphalt cements used in roofingASTM D 2822; D 3019; D 4586
Asphalt-coated glass fiber base sheetASTM D 4601
Asphalt coatings used in roofingASTM D 1227; D 2823; D 2824; D 4479
Asphalt glass feltASTM D 2178
Asphalt primer used in roofingASTM D 41
Asphalt-saturated and asphalt-coated organic felt base sheetASTM D 2626
Asphalt-saturated organic felt (perforated)ASTM D 226
Asphalt used in roofingASTM D 312
Coal-tar cements used in roofingASTM D 4022; D 5643
Coal-tar primer used in roofing, dampproofing and waterproofingASTM D 43
Coal-tar saturated organic feltASTM D 227
Coal-tar used in roofingASTM D 450, Type I or II
Glass mat, coal tarASTM D 4990
Glass mat, venting typeASTM D 4897
Mineral-surfaced inorganic cap sheetASTM D 3909
Thermoplastic fabrics used in roofingASTM D 5665; D 5726
R905.9.2.1
Red rosin paper shall be used when the membrane is applied directly to a wood deck or cementitious fiber decks.
Built-up roofs shall be installed according to this chapter and the manufacturer’s installation instructions.
The installation of metal roof panels shall comply with the provisions of this section.
Metal roof panel roof coverings shall be applied to solid or spaced sheathing, except where the roof covering is specifically designed to be applied to spaced supports.

Minimum slopes for metal roof panels shall comply with the following:

1. The minimum slope for lapped, nonsoldered-seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal (25-percent slope).

2. The minimum slope for lapped, nonsoldered-seam metal roofs with applied lap sealant shall be one-half vertical unit in 12 units horizontal (4-percent slope). Lap sealants shall be applied in accordance with the approved manufacturer’s installation instructions.

3. The minimum slope for standing-seam roof systems shall be one-quarter unit vertical in 12 units horizontal (2-percent slope).

Metal-sheet roof covering systems that incorporate supporting structural members shall be designed in accordance with the Florida Building Code, Building. Metal-sheet roof coverings installed over structural decking shall comply with Table R905.4.4. The materials used for metal-sheet roof coverings shall be naturally corrosion resistant or provided with corrosion resistance in accordance with the standards and minimum thicknesses shown in Table R905.4.4.

Table R905.10.3(1) Metal Roof Covering Standards.
Reserved.

Table R905.10.3(2) Minimum Corrosion Resistance.
Reserved.

Metal roof panels shall be secured to the supports in accordance with this chapter and the manufacturer’s installation instructions. Metal roofing fastened directly to steel framing shall be attached by approved fasteners. The following fasteners shall be used:

1. Galvanized fasteners shall be used for galvanized roofs.

2. Hard copper or copper alloy or 300 series stainless steel fasteners shall be used for copper roofs.

3. Stainless steel fasteners are acceptable for all types of metal roofs.

4. Aluminum-zinc coated fasteners are acceptable for aluminum-zinc coated roofs.

Underlayment shall comply with ASTM D 226, Type I or Type II or ASTM D 4869, Type II or Type IV or ASTM D 1970 or ASTM D 6757.

R905.10.5.1 Underlayment and high winds.
Reserved. R905.10.5.2 Underlayment application.
Underlayment shall be installed using one of the following methods:

1. Two layer underlayment shall comply with ASTM D 226, Type I or Type II or ASTM D 4869, Type II or Type IV or ASTM D 6757: Apply a 19-inch (483 mm) strip of underlayment felt parallel to and starting at the eaves, fastened sufficiently to hold in place. Starting at the eave, apply 36-inch-wide (914 mm) sheets of underlayment, overlapping successive sheets 19 inches (483 mm), and fastened with 1-inch (25 mm) round plastic cap, metal cap nails or nails and tintabs attached to a nailable deck with one row in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c., and one row at the overlaps fastened 6 inches (152 mm) o.c. Synthetic underlayment shall be fastened in accordance with this section and the manufacturer’s recommendations.

2. One layer underlayment shall comply with ASTM D 226, Type II or ASTM D 4869, Type IV or ASTM D 6757: Underlayment shall be applied shingle fashion, parallel to and starting from the eave and lapped 2 inches (51 mm), fastened with 1-inch (25 mm) round plastic cap, metal cap nails or nails and tin-tabs attached to a nailable deck with two staggered rows in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c., and one row at the overlaps fastened 6 inches (152 mm) o.c. Synthetic underlayment shall be fastened in accordance with this section and the manufacturer’s recommendations End laps shall be offset by 6 feet (1829 mm).

3. As an alternative, the entire roof deck shall be covered with an approved self-adhering polymer modified bitumen sheet meeting ASTM D 1970 or an approved self-adhering synthetic underlayment installed in accordance with the manufacturer’s installation instructions.

The installation of modified bitumen roofing shall comply with the provisions of this section.
Modified bitumen membrane roofs shall have a design slope of a minimum of one-fourth unit vertical in 12 units horizontal (2-percent slope) for drainage.

Modified bitumen roof coverings shall comply with the standards in Table R905.11.2.

TABLE R905.11.2
MODIFIED BITUMEN ROOFING MATERIAL STANDARDS

MATERIALSTANDARD
Acrylic coatingASTM D 6083
Asphalt adhesiveASTM D 3747
Asphalt cementASTM D 3019
Asphalt coatingASTM D 1227; D 2824
Asphalt primerASTM D 41
Modified bitumen roof membraneASTM D 6162; D 6163; D
6164; D 6222; D 6223; D
6298; D 6509; CGSB
37-GP-56M
Modified bitumen roofs shall be installed according to this chapter and the manufacturer’s installation instructions. The approved allowable uplift resistance for the modified bitumen roof shall be equal to or greater than the uplift resistance for the roof based on Table R301.2(2).
The installation of thermoset single-ply roofing shall comply with the provisions of this section.
Thermoset single-ply membrane roofs shall have a design slope of a minimum of one-fourth unit vertical in 12 units horizontal (2-percent slope) for drainage.
Thermoset single-ply roof coverings shall comply with ASTM D 4637, ASTM D 5019 or CGSB 37-GP-52M.
Thermoset single-ply roofs shall be installed according to this chapter and the manufacturer’s installation instructions. The approved allowable uplift resistance for the thermoset single-ply membrane roof shall be equal to or greater than the uplift resistance for the roof based on Table R301.2(2).
The installation of thermoplastic single-ply roofing shall comply with the provisions of this section.
Thermoplastic single-ply membrane roofs shall have a design slope of a minimum of one-fourth unit vertical in 12 units horizontal (2-percent slope).
Thermoplastic single-ply roof coverings shall comply with ASTM D 4434, ASTM D 6754, ASTM D 6878 or CGSB CAN/CGSB 37.54.
Thermoplastic single-ply roofs shall be installed according to this chapter and the manufacturer’s installation instructions. The approved allowable uplift resistance for the thermoplastic single-ply roof shall be equal to or greater than the uplift resistance for the roof based on Table R301.2(2).
The installation of sprayed polyurethane foam roofing shall comply with the provisions of this section.
Sprayed polyurethane foam roofs shall have a design slope of a minimum of one-fourth unit vertical in 12 units horizontal (2-percent slope) for drainage.
Spray-applied polyurethane foam insulation shall comply with ASTM C 1029, Type III or IV.

Foamed-in-place roof insulation shall be installed in accordance with this chapter and the manufacturer’s installation instructions. A liquid-applied protective coating that complies with Section R905.15 shall be applied no less than 2 hours nor more than 72 hours following the application of the foam. The approved allowable uplift resistance for the sprayed polyurethane foam roofing shall be equal to or greater than the uplift resistance for the roof based on Table R301.2(2).

Table R905.14.3 Protective Coating Material Standards.
Reserved.

Foam plastic materials and installation shall comply with Section R316.
The installation of liquid-applied roofing shall comply with the provisions of this section.
Liquid-applied roofing shall have a design slope of a minimum of one-fourth unit vertical in 12 units horizontal (2-percent slope).
Liquid-applied roofing shall comply with ASTM C 836, C 957, D 1227, D 3468, D 6083, D 6694 or D 6947.
Liquid-applied roofing shall be installed according to this chapter and the manufacturer’s installation instructions. The approved allowable uplift resistance for the liquid-applied coatings shall be equal to or greater than the uplift resistance for the roof based on Table R301.2(2).
The installation of building-integrated photovoltaic roofing modules/shingles shall comply with the provisions of this section.
Building-integrated photovoltaic roofing modules/shingles shall be listed and labeled in accordance with UL 1703.
Building-integrated photovoltaic roofing modules/shingles shall be attached in accordance with the manufacturer’s installation instructions.
Building-integrated photovoltaic roofing modules/shingles shall be tested in accordance with procedures and acceptance criteria in ASTM D 3161 or TAS 107. Building-integrated photovoltaic roofing modules/shingles shall comply with the classification requirements of Table R905.2.6.1 for the appropriate maximum basic wind speed. Building-integrated photovoltaic roofing modules/shingle packaging shall bear a label to indicate compliance with the procedures in ASTM D 3161 or TAS 107 and the required classification from Table R905.2.6.1.
Rooftop mounted photovoltaic systems shall be designed in accordance with this section.
Rooftop mounted photovoltaic systems shall be designed for wind loads for component and cladding in accordance with Chapter 16 of the Florida Building Code, Building using an effective wind area based on the dimensions of a single unit frame.
Rooftop mounted photovoltaic systems shall have the same fire classification as the roof assembly required by Section R902.
Rooftop mounted photovoltaic systems shall be installed in accordance with the manufacturer’s installation instructions.
Photovoltaic panels and modules mounted on top of a roof shall be listed and labeled in accordance with UL 1703 and shall be installed in accordance with the manufacturer’s installation instructions.
The use of above-deck thermal insulation shall be permitted provided such insulation is covered with an approved roof covering and complies with FM 4450 or UL 1256.

Above-deck thermal insulation board shall comply with the standards in Table R906.2.

TABLE R906.2
MATERIAL STANDARDS FOR ROOF INSULATION

Cellular glass boardASTM C 552
Composite boardsASTM C 1289, Type III, IV, V or
VI
Expanded polystyreneASTM C 578
Extruded polystyrene boardASTM C 578
Perlite boardASTM C 728
Polyisocyanurate boardASTM C 1289, Type I or II
Wood fiberboardASTM C 208

Materials and methods of application used for re-covering or replacing an existing roof covering shall comply with the requirements of Chapter 9 of the Florida Building Code, Residential.

Exception: Reroofing shall not be required to meet the minimum design slope requirement of one-quarter unit vertical in 12 units horizontal (2-percent slope) in Section R905 for roofs that provide positive roof drainage.
The structural roof components shall be capable of supporting the roof covering system and the material and equipment loads that will be encountered during installation of the roof covering system.

New roof coverings shall not be installed without first removing all existing layers of roof coverings where any of the following conditions occur:

1. Where the existing roof or roof covering is watersoaked or has deteriorated to the point that the existing roof or roof covering is not adequate as a base for additional roofing.

2. Where the existing roof covering is wood shingle or shake, slate, clay, cement or asbestos-cement tile.

3. Where the existing roof has two or more applications of any type of roof covering.

4. When blisters exist in any roofing, unless blisters are cut or scraped open and remaining materials secured down before applying additional roofing.

5. Where the existing roof is to be used for attachment for a new roof system and compliance with the securement provisions of Section R905 cannot be met.

Exceptions:

1. Complete and separate roofing systems, such as standing-seam metal roof systems, that are designed to transmit the roof loads directly to the building’s structural system and that do not rely on existing roofs and roof coverings for support, shall not require the removal of existing roof coverings.

2. Reserved.

3. The application of new protective coating over existing spray polyurethane foam roofing systems shall be permitted without tear-off of existing roof coverings.

4. Reserved.

5. Roof Coating. Application of elastomeric and/or maintenance coating systems over existing asphalt shingles shall be in accordance with the shingle manufacturer’s approved installation instructions.

Reserved.
Existing slate, clay or cement tile shall be permitted for reinstallation, except that damaged, cracked or broken slate or tile shall not be reinstalled. Any existing flashings, edgings, outlets, vents or similar devices that are a part of the assembly shall be replaced when rusted, damaged or deteriorated. Aggregate surfacing materials shall not be reinstalled.
Flashings shall be reconstructed in accordance with approved manufacturer’s installation instructions. Metal flashing to which bituminous materials are to be adhered shall be primed prior to installation.

When a roof covering on an existing site-built singlefamily residential structure is removed and replaced, the following procedures shall be permitted to be performed by the roofing contractor:

1. Roof-decking attachment shall be as required by Section R907.7.1.

2. A secondary water barrier shall be provided as required by Section R907.7.2.

Exception: Single-family residential structures permitted subject to the Florida Building Code are not required to comply with this section.

For site-built single-family residential structures, the fastening shall be in accordance with Section R907.7.1.1 or R907.7.1.2 as appropriate for the existing construction. 8d nails shall be a minimum of 0.113 inch (2.9 mm) in diameter and shall be a minimum of 21/4 inches (57 mm) long to qualify for the provisions of this section for existing nails, regardless of head shape or head diameter.

R907.7.1.1
Roof decking consisting of sawn lumber or wood planks up to 12 inches (305 mm) wide and secured with at least two nails (minimum size 8d) to each roof framing member it crosses shall be deemed to be sufficiently connected. Sawn lumber or wood plank decking secured with smaller fasteners than 8d nails or with fewer than two nails (minimum size 8d) to each framing member it crosses shall be deemed sufficiently connected if fasteners are added such that two clipped head, round head, or ring shank nails (minimum size 8d) are in place on each framing member it crosses. R907.7.1.2
For roof decking consisting of wood structural panels, fasteners and spacing required in columns 3 and 4 of Table R907.7.1.2 are deemed to comply with the indicated design wind speed range. Wood structural panel connections retrofitted with a two part urethane based closed cell adhesive sprayed onto the joint between the sheathing and framing members are deemed to comply provided testing using the manufacturer’s recommended application on panels connected with 6d smooth shank nails at no more than a 6-inch (152 mm) edge and 12-inch (305 mm) field spacing demonstrate an uplift resistance of a minimum of 200 psf.
Supplemental fasteners, as required by Table R907.7.1.2, shall be 8d ring shank nails with round heads and the following minimum dimensions:

1. 0.113-inch (2.9 mm) nominal shank diameter.

2. Ring diameter a minimum of 0.010-inch (0.25 mm) over shank diameter.

3. 16 to 20 rings per inch.

4. A minimum 0.280-inch (7 mm) full round head diameter.

5. Ring shank to extend a minimum of 11/2 inches (38 mm) from the tip of the nail.

6. Minimum 23/8-inch (60 mm) nail length.

TABLE R907.7.1.2
SUPPLEMENT FASTENERS AT PANEL EDGES AND
INTERMEDIATE FRAMING

EXISTING
FASTENERS
EXISTING
SPACING
Vasd 110 MPH OR
LESS
SUPPLEMENTAL
FASTENER
SPACING SHALL
BE NO GREATER
THAN
Vasd GREATER
THAN 110 MPH
SUPPLEMENTAL
FASTENER
SPACING
SHALL BE NO
GREATER THAN
Staples or 6dAny6 inches o.c.b6 inches o.c.b
8d clipped
head, round
head, smooth or
ring shank
6 inches
o.c. or
less
None necessaryNone necessary
8d clipped
head, round
head, smooth or
ring shank
Greater
than
6 inches
o.c.
6 inches o.c.a6 inches o.c.a
For SI: 1 inch = 25.4 mm.
a. Maximum spacing determined based on existing fasteners and supplemental fasteners.
b. Maximum spacing determined based on supplemental fasteners only.
c. Vasd shall be determined in accordance with Section 1609.3.1 of the Florida Building Code, Building or Section R301.2.1.3 of the Florida Building Code, Residential.

A secondary water barrier shall be installed using one of the following methods when roof covering is removed and replaced:

1. In either High-Velocity Hurricane Zone (HVHZ) or Non-HVHZ regions:

a) All joints in structural panel roof sheathing or decking shall be covered with a minimum 4 inch (102 mm) wide strip of self-adhering polymer modified bitumen tape applied directly to the sheathing or decking. The deck and self-adhering polymer modified bitumen tape shall be covered with one of the underlayment systems approved for the particular roof covering to be applied to the roof.

b) The entire roof deck shall be covered with an approved asphalt impregnated 30# felt underlayment or approved synthetic underlayment installed with nails and tin-tabs in accordance with Sections 1518.2.2, 1518.2.3, or 1518.2.4 of the Florida Building Code, Building. (No additional underlayment shall be required over the top of this sheet.) The synthetic underlayment shall be fastened in accordance with the manufacturer’s recommendations.

2. Outside the HVHZ:

a) The entire roof deck shall be covered with an approved self-adhering polymer modified bitumen sheet meeting ASTM D 1970 or an approved self-adhering synthetic underlayment installed in accordance with the manufacturer’s installation instructions. No additional underlayment shall be required on top of this sheet for new installations.

b) An underlayment system approved for the particular roof covering shall be applied with the following modification:

(1) For roof slopes that require one layer of underlayment, a layer of approved asphalt impregnated ASTM D 226, Type I or Type II or ASTM D 4869, Type II or Type IV underlayment or approved synthetic underlayment shall be installed. The felt is to be fastened with 1-inch (25 mm) round plastic cap, metal cap nails or nails and tin-tabs attached to a nailable deck with two staggered rows in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c., and one row at the overlaps fastened 6 inches (152 mm) o.c. Synthetic underlayment shall be fastened in accordance with this section and the manufacturer’s recommendations.

(2) For roof slopes that require two layers of underlayment, an approved asphalt impregnated ASTM D 226 Type I or Type II, ASTM D 4869, Type II or Type IV underlayment shall be installed in a shingle–fashion and lapped 19 inch (483 mm) and fastened with 1-inch (25 mm) round plastic cap, metal cap nails or nails and tin-tabs, attached to a nailable deck with one row in the field of the sheet with a maximum fastener spacing of 12 inches (305 mm) o.c., and one row at the overlaps fastened 6 inches (152 mm) o.c. An approved synthetic underlayment shall be installed in accordance with this section and the manufacturer’s installation instruction. (No additional underlayment shall be required over the top of this sheet.)

Exceptions:

1. Roof slopes < 2:12 having a continuous roof system shall be deemed to comply with Section R907.7.2 requirements for a secondary water barrier.

2. Clay and concrete tile roof systems installed as required by the Florida Building Code, Residential are deemed to comply with the requirements of Section R907.7.2 for Secondary Water Barriers.

When a roof covering on an existing site-built singlefamily residential structure is removed and replaced on a building that is located in the wind-borne debris region as defined in the Florida Building Code, Building and that has an insured value of $300,000 or more or, if the building is uninsured or for which documentation of insured value is not presented, has a just valuation for the structure for purposes of ad valorem taxation of $300,000 or more:

(a) Roof to wall connections shall be improved as required by Section R907.8.1.

(b) Mandated retrofits of the roof-to-wall connection shall not be required beyond a 15-percent increase in the cost of reroofing.

Exception: Single-family residential structures permitted subject to the Florida Building Code are not required to comply with this section.

Where required by Section R907.8, the intersection of roof framing with the wall below shall provide sufficient resistance to meet the uplift loads specified in Table R907.8.1 either because of existing conditions or through retrofit measures. As an alternative to an engineered design, the prescriptive retrofit solutions provided in Sections R907.8.1.1 through R907.8.1.7 shall be accepted as meeting the mandated roof-to-wall retrofit requirements.

Exceptions:

1. Where it can be demonstrated (by code adoption date documentation and permit issuance date) that roof-to-wall connections and/or roof-to-foundation continuous load path requirements were required at the time of original construction.

2. Roof-to-wall connections shall not be required unless evaluation and installation of connections at gable ends or all corners can be completed for 15 percent of the cost of roof replacement.

TABLE R907.8.1
REQUIRED UPLIFT CAPACITIES FOR ROOF-TO-WALL CONNECTIONSa, b (POUNDS PER LINEAR FOOT)

Ultimate Design Wind Speed, VultRoof Span (feet)Overhangs
12202428323640
Within 6 feet of building corner85-69.85 -116.42-139.70-162.99-186.27-209.55-232.84-27
90-82.67-137.78 -165.34-192.90-220.45-248.01-275.57-30.3
100-110.51-184.18-221.01-257.85-294.68-331.52-368.36-37.4
110-141.27-235.45-282.55-329.64-376.73-423.82-470.91-45.3
120-174.97 -291.62-349.94-408.26-466.59-524.91-583.23-53.9
130-211.60-352.66-423.19-493.72-564.26-634.79-705.32-63.2
140 -251.15 -418.59-502.31-586.02-669.74-753.46-837.18-73.3
150 -293.64-489.40-587.28-685.16-783.04-880.92-978.80-84.2
170-387.40-645.67-774.81-903.94-1033.08-1162.21-1291.35-108
Greater than 6 feet from building corner85-39.10-65.17-78.20-91.24-104.27-117.30-130.34-27
90-48.20-80.33-96.39-112.46-128.52-144.59-160.66-30.3
100-67.95-113.24 -135.89-158.54-181.19-203.84-226.49-37.4
110-89.78-149.63-179.55-209.48-239.40-269.33-299.25-45.3
120-113.68-189.47-227.37-265.26-303.16-341.05-378.94-53.9
130-139.67-232.78 -279.34 -325.90 -372.45-419.01-465.57-63.2
140-167.74-279.56-335.47-391.38-447.29-503.21-559.12-73.3
150-197.88-329.80-395.76-461.72-527.68-593.64-659.60-84.2
170-264.41 -440.68 -528.81 -616.95-705.08-793.22-881.35-108
For SI: 1 foot = 304.8mm; 1 pound per linear foot = 1.488 kg/m; 1 mile per hour = 0.305 m/s.
a. The uplift loads are pounds per lineal foot of building length. For roof uplift connections multiply by 1.33 for framing spaced 16 inches on center and multiply by 2 for framing spaced 24 inches on center.
b. The uplift loads 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 12 inches on center. The overhang loads given shall be multiplied by the overhang projection and added to the roof uplift value in the table.
c. For Ultimate Design Wind Speeds, Vult, greater than 170 mph, wind uplift forces shall be determined in accordance with Section R802.3 or ASCE 7.
d. Ultimate Design Wind Speeds determined from Figure R301.2(4).
These provisions are not intended to limit the means for gaining access to the structural elements of the roof and wall for the purposes of retrofitting the connection. The retrofit of roof to wall connections can be made by access through the area under the eave, from above through the roof, or from the interior of the house. Methods for above access include removal of roof panels or sections thereof or removal of portions of roof paneling at selected locations large enough for access, viewing, and installing the retrofit connectors and fasteners.
Where panels or sections are removed, the removed portions shall not be reused. New paneling shall be used and fastened as in new construction.
Holes shall be deemed adequately repaired if a patch of paneling is installed with no gap greater than 1/2 inch (13 mm) between the patch and the existing sheathing and if the patch is supported using one of the following methods.

a) Solid 11/2 inch lumber shall fully support the patch and shall be secured to the existing sheathing with #8 by 11/4 inch screws spaced a minimum of 3 inches (76 mm) around the perimeter with screws a minimum of 3/4 inch (19 mm) from the near edge of the hole. The patch shall be secured to the lumber with #8 × 1-1/ 4 inch screws spaced on a grid no greater than 6 inches by 6 inches (152 mm by 152 mm) with no fewer than two screws.

b) Holes that extend horizontally from roof framing member to adjacent roofing framing member that are less than or equal to 7 inches (178 mm) wide along the slope of the roof shall be supported by minimum of 2 × 4 lumber whose face is attached to each roofing framing members using a minimum of two each 3-inch (76 mm) long fasteners (#8 screws or 10d common nails) connecting the two. The patch shall have attached to its bottom, running horizontally, a minimum 2 × 4 either flat wise or on edge secured with #8 × 11/4 inch screws a maximum of 4 inches (102 mm) on center and no more distant from the end of the added lumber than 3 inches (76 mm). The patch shall be secured with two #8 × 1-11/4 inch screws to each support member.

Where part of a strap is inaccessible, if the portion of the strap that is observed is fastened in compliance with these requirements, the inaccessible portion of the strap shall be presumed to comply with these requirements.
The anchorage of each of the exposed rafters or truss within 6 feet (1829 mm) of the corner along the exterior wall on each side of each gable end shall be inspected. Wherever a strap is missing or an existing strap has fewer than four fasteners on each end, approved straps, ties or right angle brackets with a minimum uplift capacity of 500 pounds (740 kg) shall be installed that connect each rafter or truss to the top plate below. Adding fasteners to existing straps shall be allowed in lieu of adding a new strap provided the strap is manufactured to accommodate at least four fasteners at each end. Wherever access makes it possible (without damage of the wall or soffit finishes), both top plate members shall be connected to the stud below using a stud to plate connector with a minimum uplift capacity of 500 pounds (740 kg). Use of straps that connect directly from the rafter or truss to the wall stud below shall be allowed as an alternate provided the two members align with no more than 11/2 inches (38 mm) offset.
The anchorage of each of the exposed rafters or truss within 6 feet (1829 mm) of the corner along the exterior wall on each side of each gable end shall be inspected. Wherever a strap is missing or an existing strap has fewer than four fasteners on each end, approved straps, ties or right angle gusset brackets with a minimum uplift capacity of 500 pounds (740 kg) shall be installed that connect each rafter or truss to the top plate below or directly to the masonry wall using approved masonry screws of a length and diameter recommended by the manufacturer. In the absence of manufacturer’s recommendations, screws shall provide at least a 21/2-inches (64 mm) embedment into the concrete or masonry. When the straps or right angle gusset brackets are attached to a wood sill plate, the sill plate shall be anchored to the concrete masonry wall below. This anchorage shall be accomplished by installing 1/4-inch diameter masonry screws, each with supplementary 1/4-inch washer, having sufficient length to develop a 21/2-inches (64 mm) embedment into the concrete and masonry. These screws shall be installed within 4 inches (102 mm) of the truss or rafter on both sides of each interior rafter or truss and on the accessible wall side of the gable end truss or rafter.
Unless it is possible to verify through nondestructive inspection or from plans prepared by a design professional that the roof structure is anchored at least as well as outlined below, access shall be provided at a minimum to the hip rafter (commonly known as a “king jack”), to the hip girder and at each corner of the hip roof. The hip rafter (commonly known as a “king jack”), the hip girder and the rafters/trusses adjacent to the hip girder that are not anchored with a strap having at least four fasteners on each end, shall be connected to the top plate below using a strap or a right angle gusset bracket having a minimum uplift capacity of 500 pounds (740 kg). Adding fasteners to existing straps shall be allowed in lieu of adding a new strap provided the strap is manufactured to accommodate at least four fasteners at each end. Wherever access makes it possible (without damage of the wall or soffit finishes), both top plate members shall be connected to the stud below using a stud to plate connector with a minimum uplift capacity of 500 lbs (740 kg). Use of straps that connect directly from the hip rafter, hip girder or adjacent rafters/trusses to the wall stud below shall be allowed as an alternate provided the two members align with no more than 11/2-inch (38 mm) offset.
Unless it is possible to verify through nondestructive inspection or from plans prepared by a design professional that the roof structure is anchored at least as well as outlined below, access shall be provided at a minimum to the hip rafter (commonly known as a “king jack”), to the hip girder and at each corner of the hip roof. The hip rafter (commonly known as a “king jack”), the hip girder and the rafters/trusses adjacent to the hip girder that are not anchored with a strap having at least four fasteners on each end, shall be connected to the concrete masonry wall below using approved straps or right angle gusset brackets with a minimum uplift capacity of 500 pounds (740 kg). Adding fasteners to existing straps shall be allowed in lieu of adding a new strap, provided the strap is manufactured to accommodate at least four fasteners at each end. The straps or right angle gusset brackets shall be installed such that they connect each rafter or truss to the top plate below or directly to the masonry wall using approved masonry screws of a length and diameter recommended by the manufacturer. In the absence of manufacturer’s recommendations, screws shall provide at least 21/2-inches (64 mm) embedment into the concrete or masonry. When the straps or right angle gusset brackets are attached to a wood sill plate, the sill plate shall be anchored to the concrete masonry wall below. This anchorage shall be accomplished by installing 1/4-inch (6 mm) diameter masonry screws, each with supplementary 1/4-inch (6 mm) washer, with sufficient length to develop a 21/2 inches (64 mm) embedment into the concrete and masonry. These screws shall be installed within 4 inches (102 mm) of the truss or rafter on both sides of each interior rafter or truss and on the accessible wall side of the gable end truss or rafter.
Priority shall be given to connecting the exterior corners of roofs to walls where the spans of the roofing members are greatest. For houses with both hip and gable roof ends, the priority shall be to retrofit the gable end roof-to-wall connections unless the width of the hip end is more than 1.5 times greater than the width of the gable end. When considering priorities for houses with both hip and gable roof ends, and the fifteen percent of the cost of roof replacement is sufficient to complete all of the prioritized elements pursuant to this section, but is not sufficient to complete all of the nonprioritized elements, then no portion of complete retrofit of the nonprioritized element is required.
Resources