Base flashing shall be of either corrosion-resistant metal of minimum nominal 0.019-inch (0.5 mm) thickness or mineral-surfaced roll roofing weighing not less than 77 pounds per 100 square feet (4 kg/m. Valley flashing shall be not less than 15 inches (381 mm) wide. 260 0 obj <>stream Interlayment shall comply with ASTM D226, Type I. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). Roof valley flashing shall be not less than No. Cap nail shank shall have a length sufficient to penetrate through the roof sheathing or not less than, The standard calculations contained in ASTM D7158 assume Exposure Category B or C and a. The installation of asphalt shingles shall comply with the provisions of this section. R905.2Asphalt shingles. For SI: 1 ounce per square foot = 0.305 kg/m. The installation of thermoplastic single-ply roofing shall comply with the provisions of this section. Built-up roofs shall be installed in accordance with this chapter and the manufacturer's instructions. For SI: 1 inch = 25.4 mm, 1 mile per hour = 0.447 m/s. Chapter 9 also provides requirements for roof drainage, flashing, above-deck thermal insulation, rooftop-mounted photovoltaic systems and recovering or replacing an existing roof covering. are not required for roofs sheathed with lumber having a nominal width of less than 3 feet Modified bitumen roofing shall comply with the standards in Table R905.11.2. Mineral-surfaced roll roofing shall conform to ASTM D3909 or ASTM D6380, Class M. Mineral-surfaced roll roofing shall be installed in accordance with this chapter and the manufacturer's instructions. PDF 2018 IRC Re-Roof Guide - Town of Severance R902.2 Fire-Retardant-Treated Shingles and Shakes, R902.3 Building-Integrated Photovoltaic Product, R902.4 Rooftop-Mounted Photovoltaic Panels and Modules, R903.4.1 Secondary (Emergency Overflow) Drains or Scuppers, R904.3 Material Specifications and Physical Characteristics, Section R905 Requirements for Roof Coverings. Where the existing roof covering is wood shake, slate, clay, cement or asbestos-cement tile. 2018 International Building Code (IBC) BASIC Upgrade to Premium CHAPTER 15 ROOF ASSEMBLIES AND ROOFTOP STRUCTURES First Version: Aug 2017 All Codes I-Codes Legend Information Code Sections My Notes 2018 International Building Code (IBC) PREFACE arrow_right arrow_right arrow_right arrow_right arrow_right arrow_right arrow_right arrow_right The installation of mineral-surfaced roll roofing shall comply with this section. ASTM B209, 0.024 minimum thickness for roll-formed panels and 0.019-inch minimum thickness for pressformed shingles. R905.2 Asphalt shingles. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). Rooftop-mounted photovoltaic systems shall be installed in accordance with the manufacturer's instructions. Where exterior plaster or adhered masonry veneer is provided on the vertical sidewall, the base flashing shall be provided in accordance with this section and Section 703.6.3. Each bundle of shakes shall be identified by a, The installation of built-up roofs shall comply with the provisions of this section and the manufacturer's. Where anchored masonry veneer is provided on the vertical sidewall, the base flashing shall be provided in accordance with this section and counterflashing shall be provided in accordance with, Flashing against a vertical front wall, as well as soil, A drip edge shall be provided at eaves and rake edges of shingle roofs. Valley linings shall be installed in accordance with the manufacturer's instructions before applying shingles. Where the existing roof covering is slate, clay, cement or asbestos-cement tile. 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 (9.5 mm) head, complying with ASTM F1667, of a length to penetrate through the roofing materials and not less than 3 / 4 inch (19.1 mm) into the roof sheathing. For open valleys (valley lining exposed) lined with metal, the valley lining shall be not less than 24 inches (610 mm) wide and of any of the corrosion-resistant metals in Table R905.2.8.2. 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, Asphalt shingles shall have the minimum number of fasteners required by the manufacturer's, Where required, ice barriers shall comply with, Flashing for asphalt shingles shall comply with this section and the asphalt shingle manufacturer's, Base and cap flashing shall be installed in accordance with manufacturer's instructions. 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 (9.5 mm) head, complying with ASTM F1667, of a length to penetrate through the roofing materials and not less than 3 / 4 inch (19.1 mm) into the roof sheathing. Nails shall be corrosion resistant and not less than 11-gage, Tile shall be applied in accordance with this chapter and the, At the juncture of roof vertical surfaces, flashing and counterflashing shall be provided in accordance with this chapter and the, Roof valley flashing shall be of corrosion-resistant metal of the same material as the. For SI: 1 ounce per square foot = 0.305 kg/m, The installation of modified bitumen roofing shall comply with the provisions of this section and the manufacturer's, Modified bitumen roofing shall have a design. Copper, brass, bronze, copper alloy and 300-series stainless steel fasteners shall be used for copper roofs. In areas where there has been a history of ice forming along the eaves causing a backup of water, as designated in, The use of above-deck thermal insulation shall be permitted provided that such insulation is covered with an. Asphalt shingles shall be tested in accordance with ASTM D7158. Fifteen-inch (381 mm) or 18-inch (457 mm) wood shakes shall be permitted to be used for the final course at the. Sprayed polyurethane foam roofs shall have a design. Slate shingles shall be installed in accordance with this chapter and the manufacturer's instructions. Section R901 General R901.1 Scope The provisions of this chapter shall govern the design, materials, construction and quality of roof assemblies. See Table R503.2.1.1 for minimum allowable panel thickness by span and load.) 12 oz/sq ft for preformed metal shingle systems. Nails shall be corrosion resistant and not less than 11-gage, Tile shall be applied in accordance with this chapter and the, At the juncture of roof vertical surfaces, flashing and counterflashing shall be provided in accordance with this chapter and the, Roof valley flashing shall be of corrosion-resistant metal of the same material as the. For SI: 1 ounce per square foot = 0.305 kg/m, The installation of modified bitumen roofing shall comply with the provisions of this section and the manufacturer's, Modified bitumen roofing shall have a design. Slate shingles shall be installed in accordance with this chapter and the manufacturer's instructions. Valley and flashing metal shall be a minimum uncoated thickness of 0.0179-inch (0.5 mm) zinc coated G90. 1. Wood shakes shall comply with the requirements of Table R905.8.5. hb```g``:AX,;nkga3l~/ * arrow_right. 201 0 obj <> endobj 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 (9.5 mm) head, complying with ASTM F1667, of a length to penetrate through the roofing materials and not less than 3 / 4 inch (19.1 mm) into the roof sheathing. The installation of sprayed polyurethane foam roofing shall comply with the provisions of this section. Modified bitumen roofing shall comply with the standards in Table R905.11.2. Mineral-surfaced roll roofing shall conform to ASTM D3909 or ASTM D6380, Class M. Mineral-surfaced roll roofing shall be installed in accordance with this chapter and the manufacturer's instructions. Sprayed polyurethane foam roofs shall have a design. 26 gage [0.019 inch (0.5 mm)] corrosion-resistant sheet metal and shall extend not less than 11 inches (279 mm) from the centerline each way. . The installation of mineral-surfaced roll roofing shall comply with this section. Mineral-surfaced roll roofing shall be fastened to solidly sheathed roofs. The bottom layer shall be 18 inches (457 mm) and the top layer not less than 36 inches (914 mm) wide. 2. The second R-value applies when more than half of the insulation is on the interior of the mass wall. 2018 International Building Code (Ibc) | Icc Digital Codes Where required, an ice barrier shall comply with Section 905.1.2. The installation of thermoplastic single-ply roofing shall comply with the provisions of this section. Wood shingles shall be laid with a side lap not less than 1, NAIL REQUIREMENTS FOR WOOD SHAKES AND WOOD SHINGLES, Roof flashing shall be not less than No. Wood shingles shall be laid with a side lap not less than 1, NAIL REQUIREMENTS FOR WOOD SHAKES AND WOOD SHINGLES, Roof flashing shall be not less than No. 3. Foamed-in-place roof insulation shall be installed in accordance with this chapter and the manufacturer's instructions. Liquid-applied roofing shall comply with ASTM C836, C957, D1227, D3468, D6083, D6694 or D6947. Flashing for asphalt shingles shall comply with this section. PDF Residential Roof Sheathing and Shear Walls or Braced Wall Panels The installation of slate shingles shall comply with the provisions of this section. Slate shingles shall be secured to the roof with two fasteners per slate. Adjacent segments of drip edge shall be overlapped not less than 2 inches (51 mm). Interlayment shall comply with ASTM D226, Type I. Paint systems in accordance with ASTM A755 shall be applied over steel products with corrosion-resistant coatings complying with ASTM A792, ASTM A875, ASTM A463, or ASTM A653. Asphalt shingles shall be fastened to solidly sheathed decks. Interlayment shall comply with ASTM D226, Type I. Roof penetrations shall be flashed and sealed in accordance with this chapter. Foam plastic materials and installation shall comply with. PDF 2021 Significant Code Changes for the IRC - National Association of Where siding is provided on the vertical sidewall, the vertical leg of the flashing shall be continuous under the siding. Asphalt shingles shall be fastened to solidly sheathed decks. Modified bitumen roofs shall be installed in accordance with this chapter and the manufacturer's instructions. IRC Section Table 301.5 Minimum Uniformly Distributed Live Loads: Section R901 General R901.1 Scope The provisions of this chapter shall govern the design, materials, construction and quality of roof assemblies. Liquid-applied roofing shall be installed in accordance with this chapter and the manufacturer's instructions. For SI: 1 ounce per square foot = 0.305 kg/m, The installation of modified bitumen roofing shall comply with the provisions of this section and the manufacturer's, Modified bitumen roofing shall have a design. The ratio changes based on climate severity. Clay or Concrete Tile Roofs | Building America Solution Center - PNNL The installation of asphalt shingles shall comply with the provisions of this section. Please see IRC Sec- Asphalt shingles shall be tested in accordance with ASTM D7158. Asphalt shingles shall be tested in accordance with ASTM D7158. Roof Sheathing Thickness | The Building Code Forum 12 oz/sq ft for preformed metal shingle systems. Same as Maximum Ultimate Design Wind Speed, Preservative-treated shakes and shingles of, Fire-retardant-treated shakes and shingles of, Preservative-treated tapersawn shakes of Southern pine treated in accordance with AWPA Standard U1 (Commodity Specification A, Special Requirement 4.6), Forest Products Laboratory of the Texas Forest Services, Preservative-treated tapersawn shakes of Southern Yellow Pine, Asphalt-saturated and asphalt-coated organic felt base sheet, Asphalt-saturated organic felt (perforated), Coal-tar primer used in roofing, dampproofing and waterproofing, ASTM B370 minimum 16 oz/sq ft and 12 oz/sq ft high-yield copper for metal-sheet. CHAPTER 8 ROOF-CEILING CONSTRUCTION. In areas where the average daily temperature in January is 25F (-4C) or less, Wood shingles shall be installed in accordance with this chapter and the manufacturer's instructions. Liquid-applied roofing shall comply with ASTM C836, C957, D1227, D3468, D6083, D6694 or D6947. hbbd```b``3@$R&5d}"uA$$X ,>,rLYfH 2o2dbO C"=Vbz CHEX/#300 k In areas where there has been a history of ice forming along the eaves causing a backup of water as designated in. Asphalt shingle packaging shall bear a. Valley linings shall be installed in accordance with the manufacturer's instructions before applying shingles.