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ROOF ASSEMBLIES > Color profile: Generic CMYK printer profile Composite Default screen CHAPTER 9 ROOF ASSEMBLIES SECTION R901 R903.2.2 Crickets and saddles. A cricket or saddle shall GENERAL be installed on the ridge side of any chimney or penetra- R901.1 Scope. The provisions of this chapter shall govern the tion more than 30 inches (762 mm) wide as measured per- design, materials, construction and quality of roof assemblies. pendicular to the slope. Cricket or saddle coverings shall be sheet metal or of the same material as the roof cover- Pursuant to ORS 215.730; if a single family dwelling is ing. located on land zoned forest, land shall have a fire retardant roof. R903.3 Coping. Parapet walls shall be properly coped with noncombustible, weatherproof materials of a width no less See Section R325 Wildfire Hazard Mitigation for additional than the thickness of the parapet wall. roofing material requirements. R903.4 Roof drainage. Unless roofs are sloped to drain over roof edges, roof drains shall be installed at each low point of the SECTION R902 roof. Where required for roof drainage, scuppers shall be ROOF CLASSIFICATION placed level with the roof surface in a wall or parapet. The scup- R902.1 Roofing covering materials. Roofs shall be covered per shall be located as determined by the roof slope and con- with materials as set forth in Sections R904 and R905. Class A, tributing roof area. B or C roofing shall be installed in areas designated by law as R903.4.1 Overflow drains and scuppers. Where roof requiring their use or when the edge of the roof is less than 3 drains are required, overflow drains having the same size as feet (914 mm) from a property line. Classes A, B and C roofing the roof drains shall be installed with the inlet flow line required by this section to be listed shall be tested in accor- located 2 inches (51 mm) above the low point of the roof, or dance with UL 790 or ASTM E 108. Roof assemblies with cov- overflow scuppers having three times the size of the roof erings of brick, masonry, slate, clay or concrete roof tile, drains and having a minimum opening height of 4 inches exposed concrete roof deck, ferrous or copper shingles or (102 mm) shall be installed in the adjacent parapet walls sheets, and metal sheets and shingles shall be considered Class with the inlet flow located 2 inches (51 mm) above the low A roof coverings. > point of the roof served. The installation and sizing of over- R902.2 Fire-retardant-treated shingles and shakes. flow drains, leaders and conductors shall comply with the Fire-retardant-treated wood shakes and shingles shall be treated Plumbing Code. by impregnation with chemicals by the full-cell vacuum-pres- sure process, in accordance with AWPA C1. Each bundle shall Overflow drains shall discharge to an approved location be marked to identify the manufactured unit and the manufac- and shall not be connected to roof drain lines. turer, and shall also be labeled to identify the classification of the R903.5 Hail exposure. Hail exposure, as specified in Sections material in accordance with the testing required in Section R903.5.1 and R903.5.2, shall be determined using Figure R902.1, the treating company and the quality control agency. R903.5. R903.5.1 Moderate hail exposure. One or more hail days SECTION R903 with hail diameters larger than 1.5 inches (38 mm) in a WEATHER PROTECTION 20-year period. R903.1 General. Roof decks shall be covered with approved R903.5.2 Severe hail exposure. One or more hail days with roof coverings secured to the building or structure in accor- hail diameters larger than or equal to 2.0 inches (51 mm) in a dance with the provisions of this chapter. Roof assemblies 20-year period. 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. SECTION R904 MATERIALS R903.2 Flashing. Flashings shall be installed in a manner that prevents moisture from entering the wall and roof through R904.1 Scope. The requirements set forth in this section shall joints in copings, through moisture permeable materials and at apply to the application of roof covering materials specified intersections with parapet walls and other penetrations through herein. Roof assemblies shall be applied in accordance with the roof plane. this chapter and the manufacturer’s installation instructions. Installation of roof assemblies shall comply with the applicable R903.2.1 Locations. Flashings shall be installed at wall and provisions of Section R905. roof intersections, wherever there is a change in roof slope or direction and around roof openings. Where flashing is of R904.2 Compatibility of materials. Roof assemblies shall be metal, the metal shall be corrosion resistant with a thickness of of materials that are compatible with each other and with the not less than 0.019 inch (0.5 mm) (No. 26 galvanized sheet). building or structure to which the materials are applied. 2011 OREGON RESIDENTIAL SPECIALTY CODE 9-1 1 M:\data\CODES\STATE CODES\Oregon\2011\Residential\Final VP\09_Oregon_Res_2011.vp Wednesday, April 20, 2011 12:24:56 PM Wednesday, April 20, 2011 12:25:50 PM M:\data\CODES\STATE CODES\Oregon\2011\Residential\Final VP\09_Oregon_Res_2011.vp Composite Defaultscreen Color profile:GenericCMYKprinterprofile 9-2 ROOF ASSEMBLIES 2 2011 OREGONRESIDENTIAL SPECIALTYCODE FIGURE R903.5 HAIL EXPOSURE MAP Color profile: Generic CMYK printer profile Composite Default screen ROOF ASSEMBLIES R904.3 Material specifications and physical characteris- R905.2.2 Slope. Asphalt shingles shall be used only on roof tics. Roof covering materials shall conform to the applicable slopes of two units vertical in 12 units horizontal (2:12) or standards listed in this chapter. In the absence of applicable greater. For roof slopes from two units vertical in 12 units standards or where materials are of questionable suitability, horizontal (2:12) up to four units vertical in 12 units hori- testing by an approved testing agency shall be required by the zontal (4:12), double underlayment application is required building official to determine the character, quality and limita- in accordance with Section R905.2.7. tions of application of the materials. R905.2.3 Underlayment. Unless otherwise noted, required R904.4 Product identification. Roof covering materials shall underlayment shall conform to ASTM D 226 Type I, ASTM be delivered in packages bearing the manufacturer’s identify- D 4869 Type I, or ASTM D 6757. ing marks and approved testing agency labels when required. Self-adhering polymer modified bitumen sheet shall Bulk shipments of materials shall be accompanied by the same comply with ASTM D 1970. information issued in the form of a certificate or on a bill of lad- ing by the manufacturer. R905.2.4 Asphalt shingles. Asphalt shingles shall comply with ASTM D 225 or D 3462. R905.2.4.1 Wind resistance of asphalt shingles. Asphalt SECTION R905 shingles shall be installed in accordance with ASTM D REQUIREMENTS FOR ROOF COVERINGS 7158. Asphalt shingles shall meet the classification require- R905.1 Roof covering application. Roof coverings shall be ments of Table R905.2.4.1(1) for the appropriate maximum applied in accordance with the applicable provisions of this basic wind speed. Asphalt shingle packaging shall bear a section and the manufacturer’s installation instructions. label to indicate compliance with ASTM D 7158 and the > required classification in Table R905.2.4.1(1). R905.2 Asphalt shingles. The installation of asphalt shingles shall comply with the provisions of this section. Exception: Asphalt shingles not included in the scope of ASTM D 7158 shall be tested and labeled to R905.2.1 Sheathing requirements. Asphalt shingles shall indicate compliance with ASTM D 3161 and the be fastened to solidly sheathed decks. required classification in Table R905.2.4.1(2). TABLE R905.2.4.1(1) CLASSIFICATION OF ASPHALT ROOF SHINGLES PER ASTM D 7158 MAXIMUM BASIC WIND SPEED FROM FIGURE 301.2(4) (mph) CLASSIFICATION REQUIREMENT 85 D, G or H 90 D, G or H 100 G or H 110 G or H 120 G or H 130 H 140 H 150 H For SI: 1 mile per hour = 0.447 m/s. TABLE R905.2.4.1(2) CLASSIFICATION OF ASPHALT SHINGLES PER ASTM D 3161 MAXIMUM BASIC WIND SPEED FROM FIGURE 301.2(4) (mph) CLASSIFICATION REQUIREMENT 85 A, D or F 90 A, D or F 100 A, D or F 110 F 120 F 130 F 140 F 150 F For SI: 1 mile per hour = 0.447 m/s. 2011 OREGON RESIDENTIAL SPECIALTY CODE 9-3 3 M:\data\CODES\STATE CODES\Oregon\2011\Residential\Final VP\09_Oregon_Res_2011.vp Wednesday, April 20, 2011 12:25:50 PM Color profile: Generic CMYK printer profile Composite Default screen ROOF ASSEMBLIES R905.2.5 Fasteners. Fasteners for asphalt shingles shall be flashing shall be corrosion-resistant metal of minimum galvanized steel, stainless steel, aluminum or copper roofing nominal 0.019-inch (0.5 mm) thickness. nails, minimum 12 gage [0.105 inch (3 mm)] shank with a 3 R905.2.8.2 Valleys. Valley linings shall be installed in minimum /8-inch (10 mm) diameter head, ASTM F 1667, of a length to penetrate through the roofing materials and a mini- accordance with the manufacturer’s installation instruc- 3 tions before applying shingles. Valley linings of the fol- mum of /4 inch (19 mm) into the roof sheathing. Where the 3 lowing types shall be permitted: roof sheathing is less than /4 inch (19 mm) thick, the fasteners shall penetrate through the sheathing.
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