CHAPTER 9 ROOF ASSEMBLIES - iccsafe.org

1 CHAPTER 9 roof ASSEMBLIESSECTION provisions of this CHAPTER shall govern thedesign, materials, construction and quality of roof R902 roof Roofing covering shall be coveredwith materials as set forth in Sections R904 and R905. Class A,B or C roofing shall be installed in areas designated by law asrequiring their use or when the edge of the roof is less than 3feet (914 mm) from a property line. Classes A, B and C roofingrequired to be listed by this section shall be tested in accor-dance with UL 790 or ASTM E 108. roof ASSEMBLIES with cov-erings of brick, masonry, slate, clay or concrete roof tile,exposed concrete roof deck, ferrous or copper shingles orsheets, and metal sheets and shingles, shall be considered ClassA roof Fire-retardant-treated shingles and wood shakes and shingles shall betreated by impregnation with chemicals by the full-cell vac-uum-pressure process, in accordance with AWPA C1.

2 Eachbundle shall be marked to identify the manufactured unit andthe manufacturer, and shall also be labeled to identify the clas-sification of the material inaccordance with the testingrequired in Section , the treating company and the qual-ity control R903 WEATHER decks shall be covered with approvedroof coverings secured to the building or structure in accor-dance with the provisions of this CHAPTER . roof ASSEMBLIES shallbe designed and installed in accordance with this code and theapproved manufacturer s installation instructions such that theroof assembly shall serve to protect the building or shall be installed in a manner thatprevents moisture from entering the wall and roof throughjoints in copings, through moisture permeable materials and atintersections with parapet walls and other penetrations throughthe roof shall be installed at wall androof intersections, wherever there is a change in roof slopeor direction and around roof openings.

3 Where flashing is ofmetal, the metal shall be corrosion resistant with a thicknessof not less than inch ( mm) (No. 26 galvanizedsheet). walls shall be properly coped withnoncombustible, weatherproof materials of a width no lessthan the thickness of the parapet roof roofs are sloped to drain overroof edges, roof drains shall be installed at each low point of theroof. Where required for roof drainage, scuppers shall beplaced level with the roof surface in a wall or parapet. The scup-per shall be located as determined by the roof slope and con-tributing roof Overflow drains and roofdrains are required, overflow drains having the same size asthe roof drains shall be installed with the inlet flow linelocated 2 inches (51 mm) above the low point of the roof , oroverflow scuppers having three times the size of the roofdrains and having a minimum opening height of 4 inches(102 mm) shall be installed in the adjacent parapet wallswith the inlet flow located 2 inches (51 mm) above the lowpoint of the roof served.

4 The installation and sizing of over-flow drains, leaders and conductors shall comply with theplumbing subcode ( 5 ).Overflow drains shall discharge to an approved locationand shall not be connected to roof drain Hail exposure, as specified in and , shall be determined using Moderate hail or more hail dayswith hail diameters larger than inches (38 mm) in a20-year Severe hail or more hail days withhail diameters larger than or equal to inches (51 mm) in a20-year requirements set forth in this section shallapply to the application of roof covering materials specifiedherein. roof ASSEMBLIES shall be applied in accordance withthis CHAPTER and the manufacturer s installation of roof ASSEMBLIES shall comply with the applicableprovisions of Section Compatibility of ASSEMBLIES shall beof materials that are compatible with each other and with thebuilding or structure to which the materials are Material specifications and physical covering materials shall conform to the applicablestandards listed in this CHAPTER .

5 In the absence of applicablestandards or where materials are of questionable suitability,testing by an approved testing agency shall be required by thebuilding official to determine the character, quality and limita-tions of application of the Product covering materials shallbe delivered in packages bearing the manufacturer s identify-ing marks and approved testing agency labels when RESIDENTIAL CODE 2006, NEW JERSEY :\data\CODES\STATE CODES\New Jersey\2006\NJ_Res_2006\Final VP_Chgo\ , April 17, 2007 11:41:57 AMColor profile: Generic CMYK printer profileComposite Default screen282 INTERNATIONAL RESIDENTIAL CODE 2006, NEW JERSEY EDITIONROOF ASSEMBLIESFIGURE EXPOSURE :\data\CODES\STATE CODES\New Jersey\2006\NJ_Res_2006\Final VP_Chgo\ , April 17, 2007 11:42:04 AMColor profile: Generic CMYK printer profileComposite Default screenBulk shipments of materials shall be accompanied by the sameinformation issued in the form of a certificate or on a bill of lad-ing by the R905 REQUIREMENTS FOR roof roof covering coverings shall beapplied in accordance with the applicable provisions of thissection and the manufacturer s installation instructions.

6 Unlessotherwise specified in this section, roof coverings shall beinstalled to resist the component and cladding loads specifiedin Table (2), adjusted for height and exposure in accor-dance with Table (3). Asphalt installation of asphalt shinglesshall comply with the provisions of this Sheathing shingles shallbe fastened to solidly sheathed shingles shall be used only on roofslopes of two units vertical in 12 units horizontal (2:12) orgreater. For roof slopes from two units vertical in 12 unitshorizontal (2:12) up to four units vertical in 12 units hori-zontal (4:12), double underlayment application is requiredin accordance with Section otherwise noted, requiredunderlayment shall conform to ASTM D 226 Type I, ASTMD 4869 Type I, or ASTM D polymer modified bitumen sheet shallcomply with ASTM D Asphalt shingles shall haveself-seal strips or be interlocking, and comply with ASTMD 225 or D Wind resistance of asphalt shingles shall be installed in accordance with Sec-tion Shingles classified using ASTM D 3161are acceptable for use in wind zones less than 110 mph (49m/s).

7 Shingles classified using ASTM D 3161, Class F, areacceptable for use in all cases where special fastening for asphalt shingles shall begalvanized steel, stainless steel, aluminum or copper roof -ing nails, minimum 12 gage [ inch (3 mm)] shank witha minimum3/8-inch (10 mm) diameter head, ASTM F 1667,of a length to penetrate through the roofing materials and aminimum of3/4inch (19 mm) into the roof sheathing. Wherethe roof sheathing is less than3/4inch (19 mm) thick, the fas-teners shall penetrate through the sheathing. Fasteners shallcomply with ASTM F shingles shall have the min-imum number of fasteners required by the normal application, asphalt shingles shall be secured tothe roof with not less than four fasteners per strip shingle ortwo fasteners per individual shingle.

8 Where the roof slopeexceeds 20 units vertical in 12 units horizontal (167 percentslope), special methods of fastening are required. For roofslocated where the basic wind speed per Figure (4) is110 mph (49 m/s) or higher, special methods of fasteningare required. Special fastening methods shall be tested inaccordance with ASTM D 3161, Class F. Asphalt shinglewrappers shall bear a label indicating compliance withASTM D 3161, Class Underlayment roof slopes fromtwo units vertical in 12 units horizontal (17-percent slope), upto four units vertical in 12 units horizontal (33-percent slope),underlayment shall be two layers applied in the followingmanner.

9 Apply a 19-inch (483 mm) strip of underlayment feltparallel to and starting at the eaves, fastened sufficiently tohold in place. Starting at the eave, apply 36-inch-wide (914mm) sheets of underlayment, overlapping successive sheets19 inches (483 mm), and fastened sufficiently to hold inplace. Distortions in the underlayment shall not interfere withthe ability of the shingles to seal. For roof slopes of four unitsvertical in 12 units horizontal (33-percent slope) or greater,underlayment shall be one layer applied in the followingmanner. Underlayment shall be applied shingle fashion, par-allel to and starting from the eave and lapped 2 inches (51mm), fastened sufficiently to hold in place.

10 Distortions in theunderlayment shall not interfere with the ability of the shin-gles to seal. End laps shall be offset by 6 feet (1829 mm). Ice areas where the average dailytemperature in January is 25 F (-4 C) or less, an ice bar-rier that consists of a least two layers of underlaymentcemented together or of a self-adhering polymer modi-fied bitumen sheet, shall be used in lieu of normalunderlayment and extend from the lowest edges of allroof surfaces to a point at least 24 inches (610 mm) insidethe exterior wall line of the :Detached accessory structures that con-tain no conditioned floor Underlayment and high applied in areas subject to high winds [above 110mph (49 m/s) per Figure (4)] shall be applied withcorrosion-resistant fasteners in accordance with manu-facturer s installation instructions.