CHAPTER 9 ROOF ASSEMBLIES - iccsafe.org

1 Color profile: Generic CMYK printer profile Composite Default screen CHAPTER 9. roof ASSEMBLIES . SECTION R901 roof drainage. Unless roofs are sloped to drain over GENERAL roof edges, roof drains shall be installed at each low point of the roof . Where required for roof drainage, scuppers shall be Scope. The provisions of this CHAPTER shall govern the placed level with the roof surface in a wall or parapet. The scup- design, materials, construction and quality of roof ASSEMBLIES . per shall be located as determined by the roof slope and con- tributing roof area. SECTION R902 Overflow drains and scuppers. Where roof roof CLASSIFICATION drains are required, overflow drains having the same size as the roof drains shall be installed with the inlet flow line Roofing covering materials. Roofs shall be covered located 2 inches (51 mm) above the low point of the roof , or with materials as set forth in Sections R904 and R905. Class A, overflow scuppers having three times the size of the roof B or C roofing shall be installed in areas designated by law as drains and having a minimum opening height of 4 inches requiring their use or when the edge of the roof is less than 3.

2 (102 mm) shall be installed in the adjacent parapet walls feet (914 mm) from a property line. Classes A, B and C roofing with the inlet flow located 2 inches (51 mm) above the low required to be listed by this section shall be tested in accor- point of the roof served. The installation and sizing of over- dance with UL 790 or ASTM E 108. roof ASSEMBLIES with cov- flow drains, leaders and conductors shall comply with the erings of brick, masonry, slate, clay or concrete roof tile, plumbing subcode ( 5 ). exposed concrete roof deck, ferrous or copper shingles or sheets, and metal sheets and shingles, shall be considered Class Overflow drains shall discharge to an approved location A roof coverings. and shall not be connected to roof drain lines. Fire-retardant-treated shingles and shakes. Hail exposure. Hail exposure, as specified in Sections Fire-retardant-treated wood shakes and shingles shall be and , shall be determined using Figure treated by impregnation with chemicals by the full-cell vac- uum-pressure process, in accordance with AWPA C1.

3 Each Moderate hail exposure. One or more hail days bundle shall be marked to identify the manufactured unit and with hail diameters larger than inches (38 mm) in a the manufacturer, and shall also be labeled to identify the clas- 20-year period. sification of the material in accordance with the testing required in Section , the treating company and the qual- Severe hail exposure. One or more hail days with ity control agency. hail diameters larger than or equal to inches (51 mm) in a 20-year period. SECTION R903. WEATHER PROTECTION SECTION R904. General. roof decks shall be covered with approved MATERIALS. roof coverings secured to the building or structure in accor- Scope. The requirements set forth in this section shall dance with the provisions of this CHAPTER . roof ASSEMBLIES shall apply to the application of roof covering materials specified be designed and installed in accordance with this code and the herein. roof ASSEMBLIES shall be applied in accordance with approved manufacturer's installation instructions such that the this CHAPTER and the manufacturer's installation instructions.

4 roof assembly shall serve to protect the building or structure. Installation of roof ASSEMBLIES shall comply with the applicable provisions of Section R905. Flashing. Flashings shall be installed in a manner that prevents moisture from entering the wall and roof through Compatibility of materials. roof ASSEMBLIES shall be joints in copings, through moisture permeable materials and at of materials that are compatible with each other and with the intersections with parapet walls and other penetrations through building or structure to which the materials are applied. the roof plane. Material specifications and physical characteris- Locations. Flashings shall be installed at wall and tics. roof covering materials shall conform to the applicable roof intersections, wherever there is a change in roof slope standards listed in this CHAPTER . In the absence of applicable or direction and around roof openings. Where flashing is of standards or where materials are of questionable suitability, metal, the metal shall be corrosion resistant with a thickness testing by an approved testing agency shall be required by the of not less than inch ( mm) (No.)

5 26 galvanized building official to determine the character, quality and limita- sheet). tions of application of the materials. Coping. Parapet walls shall be properly coped with Product identification. roof covering materials shall noncombustible, weatherproof materials of a width no less be delivered in packages bearing the manufacturer's identify- than the thickness of the parapet wall. ing marks and approved testing agency labels when required. INTERNATIONAL RESIDENTIAL CODE 2006, NEW JERSEY EDITION 281. 1. M:\data\CODES\STATE CODES\New Jersey\2006\NJ_Res_2006\Final VP_Chgo\ Tuesday, April 17, 2007 11:41:57 AM. Color profile: Generic CMYK printer profile Composite Default screen roof ASSEMBLIES . HAIL EXPOSURE MAP. FIGURE 282 INTERNATIONAL RESIDENTIAL CODE 2006, NEW JERSEY EDITION. 2. M:\data\CODES\STATE CODES\New Jersey\2006\NJ_Res_2006\Final VP_Chgo\ Tuesday, April 17, 2007 11:42:04 AM. Color profile: Generic CMYK printer profile Composite Default screen roof ASSEMBLIES .

6 Bulk shipments of materials shall be accompanied by the same 110 mph (49 m/s) or higher, special methods of fastening information issued in the form of a certificate or on a bill of lad- are required. Special fastening methods shall be tested in ing by the manufacturer. accordance with ASTM D 3161, Class F. Asphalt shingle wrappers shall bear a label indicating compliance with ASTM D 3161, Class F.. SECTION R905. Underlayment application. For roof slopes from REQUIREMENTS FOR roof COVERINGS two units vertical in 12 units horizontal (17-percent slope), up roof covering application. roof coverings shall be to four units vertical in 12 units horizontal (33-percent slope), applied in accordance with the applicable provisions of this underlayment shall be two layers applied in the following section and the manufacturer's installation instructions. Unless manner. Apply a 19-inch (483 mm) strip of underlayment felt otherwise specified in this section, roof coverings shall be parallel to and starting at the eaves, fastened sufficiently to installed to resist the component and cladding loads specified hold in place.

7 Starting at the eave, apply 36-inch-wide (914. in Table (2), adjusted for height and exposure in accor- mm) sheets of underlayment, overlapping successive sheets dance with Table (3). 19 inches (483 mm), and fastened sufficiently to hold in Asphalt shingles. The installation of asphalt shingles place. Distortions in the underlayment shall not interfere with shall comply with the provisions of this section. the ability of the shingles to seal. For roof slopes of four units vertical in 12 units horizontal (33-percent slope) or greater, Sheathing requirements. Asphalt shingles shall underlayment shall be one layer applied in the following be fastened to solidly sheathed decks. manner. Underlayment shall be applied shingle fashion, par- Slope. Asphalt shingles shall be used only on roof allel to and starting from the eave and lapped 2 inches (51. slopes of two units vertical in 12 units horizontal (2:12) or mm), fastened sufficiently to hold in place. Distortions in the greater.

8 For roof slopes from two units vertical in 12 units underlayment shall not interfere with the ability of the shin- horizontal (2:12) up to four units vertical in 12 units hori- gles to seal. End laps shall be offset by 6 feet (1829 mm). zontal (4:12), double underlayment application is required Ice barrier. In areas where the average daily in accordance with Section temperature in January is 25 F (-4 C) or less, an ice bar- Underlayment. Unless otherwise noted, required rier that consists of a least two layers of underlayment underlayment shall conform to ASTM D 226 Type I, ASTM cemented together or of a self-adhering polymer modi- D 4869 Type I, or ASTM D 6757. fied bitumen sheet, shall be used in lieu of normal underlayment and extend from the lowest edges of all Self-adhering polymer modified bitumen sheet shall roof surfaces to a point at least 24 inches (610 mm) inside comply with ASTM D 1970. the exterior wall line of the building. Asphalt shingles. Asphalt shingles shall have Exception: Detached accessory structures that con- self-seal strips or be interlocking, and comply with ASTM.

9 Tain no conditioned floor area. D 225 or D 3462. Wind resistance of asphalt shingles. Underlayment and high wind. Underlay- Asphalt shingles shall be installed in accordance with Sec- ment applied in areas subject to high winds [above 110. tion Shingles classified using ASTM D 3161 mph (49 m/s) per Figure (4)] shall be applied with are acceptable for use in wind zones less than 110 mph (49 corrosion-resistant fasteners in accordance with manu- m/s). Shingles classified using ASTM D 3161, Class F, are facturer's installation instructions. Fasteners are to be acceptable for use in all cases where special fastening is applied along the overlap not farther apart than 36 inches required. (914 mm) on center. Fasteners. Fasteners for asphalt shingles shall be Flashing. Flashing for asphalt shingles shall com- galvanized steel, stainless steel, aluminum or copper roof - ply with this section. ing nails, minimum 12 gage [ inch (3 mm)] shank with Base and cap flashing. Base and cap flashing a minimum 3/8-inch (10 mm) diameter head, ASTM F 1667, shall be installed in accordance with manufacturer's instal- of a length to penetrate through the roofing materials and a lation instructions.

10 Base flashing shall be of either corro- minimum of 3/4 inch (19 mm) into the roof sheathing. Where sion-resistant metal of minimum nominal ( the roof sheathing is less than 3/4 inch (19 mm) thick, the fas- mm) thickness or mineral surface roll roofing weighing a teners shall penetrate through the sheathing. Fasteners shall minimum of 77 pounds per 100 square feet (4 kg/m2). Cap comply with ASTM F 1667. flashing shall be corrosion-resistant metal of minimum Attachment. Asphalt shingles shall have the min- nominal ( mm) thickness. imum number of fasteners required by the manufacturer. Valleys. Valley linings shall be installed in For normal application, asphalt shingles shall be secured to accordance with the manufacturer's installation instruc- the roof with not less than four fasteners per strip shingle or tions before applying shingles. Valley linings of the fol- two fasteners per individual shingle. Where the roof slope lowing types shall be permitted: exceeds 20 units vertical in 12 units horizontal (167 percent slope), special methods of fastening are required.