or less, R905.2.4.1 Wind Resistance of Asphalt Shingles, R905.14 Sprayed Polyurethane Foam Roofing, R905.17 Building-Integrated Photovoltaic (BIPV) Roof Panels Applied Directly to the Roof Deck, Section R907 Rooftop-Mounted Photovoltaic Panel Systems, R907.1 Rooftop-Mounted Photovoltaic Panel Systems, Building-integrated photovoltaic products. The installation of wood shingles shall comply with the provisions of this section. over the entire roof and over the 4-inchwide (102 mm) membrane strips and. Roof valley flashing shall be not less than No. For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mile per hour = 0.447 m/s. 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. Asphalt shingle packaging shall bear a, 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, but not less than four fasteners per strip shingle or two fasteners per individual shingle. Asphalt shingles shall be fastened to solidly sheathed decks. If re-roofing over wood shingle, or wood shake roofs, additional code requirements may apply. Thermoset single-ply roofs shall be installed in accordance with this chapter and the manufacturer's instructions. The installation of thermoset single-ply roofing shall comply with the provisions of this section. 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. Asphalt shingles shall comply with ASTM D3462. Water soaked or deteriorating decking must be replaced. Allowable spans for lumber used as roof sheathing shall conform to Table R803.1. 0 2018 International Residential Code (IRC) COPYRIGHT PREFACE EFFECTIVE USE OF THE INTERNATIONAL RESIDENTIAL CODE arrow_right CHAPTER 1 SCOPE AND ADMINISTRATION arrow_right CHAPTER 2 DEFINITIONS arrow_right CHAPTER 3 BUILDING PLANNING arrow_right CHAPTER 4 FOUNDATIONS arrow_right CHAPTER 5 FLOORS arrow_right CHAPTER 6 WALL CONSTRUCTION arrow_right 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. The installation of mineral-surfaced roll roofing shall comply with this section. 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. 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. Asphalt shingles shall comply with ASTM D3462. 12 oz/sq ft for preformed metal shingle systems. Asphalt shingles shall be used only on roof. The ratio changes based on climate severity. A base sheet that complies with the requirements of. Mineral-surfaced roll roofing shall be fastened to solidly sheathed roofs. Slate shingles shall comply with ASTM C406. are not required for roofs sheathed with lumber having a nominal width of less than 3 feet Built-up roofs shall be installed in accordance with this chapter and the manufacturer's instructions. Valley flashing shall be not less than 15 inches (381 mm) wide. Valley and flashing metal shall be a minimum uncoated thickness of 0.0179-inch (0.5 mm) zinc coated G90. 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. The installation of wood shingles shall comply with the provisions of this section. Asphalt shingles shall be used only on roof. For SI: 1 inch = 25.4 mm, 1 mile per hour = 0.447 m/s. 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 such insulation is covered with an. Sprayed polyurethane foam roofs shall have a design. A base sheet that complies with the requirements of Section 1507.11.2 of the. Table 1 shows an insulation ratio - the R-value on the top of the roof sheathing compared to the total R-value. 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. ASTM B209, 0.024 minimum thickness for roll-formed panels and 0.019-inch minimum thickness for pressformed shingles. Asphalt shingles shall comply with ASTM D3462. Galvanized fasteners shall be used for steel roofs. Spray-applied polyurethane foam insulation shall comply with ASTM C1029, Type III or IV or ASTM D7425. 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. The installation of wood shakes shall comply with the provisions of this section. 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. 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. Galvanized fasteners shall be used for steel roofs. Thermoplastic single-ply roofs shall be installed in accordance with this chapter and the manufacturer's instructions. Asphalt shingles shall be fastened to solidly sheathed decks. arrow_right. Interlayment shall comply with ASTM D226, Type I. The installation of asphalt shingles shall comply with the provisions of this section. Asphalt shingles shall meet the classification requirements of Table R905.2.4.1 for the appropriate ultimate design wind speed. Allowable spans for lumber sheathing shall conform to IRC Table R803.1. %%EOF Slate shingles shall be fastened to solidly sheathed roofs. For open valleys, valley lining of two plies of mineral-surfaced roll roofing, complying with ASTM D3909 or ASTM D6380 Class M, shall be permitted. For closed valleys (valley covered with shingles), valley lining of one ply of smooth roll roofing complying with ASTM D6380 and not less than 36 inches wide (914 mm) or valley lining as described in Item 1 or 2 shall be permitted. 260 0 obj <>stream The installation of liquid-applied roofing shall comply with the provisions of this section. Valley linings shall be installed in accordance with the manufacturer's instructions before applying shingles. For closed valleys (valley covered with shingles), valley lining of one ply of smooth roll roofing complying with ASTM D6380 and not less than 36 inches wide (914 mm) or valley lining as described in Item 1 or 2 shall be permitted. A liquid-applied protective coating that complies with Table R905.14.3 shall be applied not less than 2 hours nor more than 72 hours following the application of the foam. For SI: 1 inch = 25.4 mm, 1 mile per hour = 0.447 m/s. Where the existing roof has two or more applications of any type of roof covering. Reroofing shall not be required to meet the minimum design, For roofs that provide positive drainage, recovering or replacing an existing, 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 do not rely on existing roofs and, Where the existing roof has two or more applications of any type of. Valley linings shall be installed in accordance with the manufacturer's instructions before applying shingles. Copper, brass, bronze, copper alloy and 300-series stainless steel fasteners shall be used for copper roofs. The 2020 Minnesota Residential Code adopts the 2018 International Residential Code (IRC). IRC Section Table 301.5 Minimum Uniformly Distributed Live Loads: The installation of built-up roofs shall comply with the provisions of this section. Liquid-applied roofing shall be installed in accordance with this chapter and the. (R803.1) Spaced lumber sheathing for wood shingle and shake roofing shall conform to the requirements of sections R905.7 and R905.8. Roof Sheathing Ring Shank nails have been added to Table R602.3(1) Fastening Schedule with the designation RSRS-01 (2-3/8" x 0.113") as an option for roof sheathing attachment. Slate shingles shall be fastened to solidly sheathed roofs. On roofs with slope equal to or greater than eight units vertical in 12 units horizontal (67-percent slope), the ice barrier shall also be applied not less than 36 inches (914 mm) measured along the roof slope from the eave edge of the building. Built-up roofs shall be installed in accordance with this chapter and the manufacturer's instructions. 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 tested in accordance with ASTM D7158. 12 oz/sq ft for preformed metal shingle systems. Asphalt shingles shall be fastened to solidly sheathed decks. Above-deck thermal insulation board shall comply with the standards in Table 906.2. Materials and methods of application used for re-covering or replacing an existing, The structural roof components shall be capable of supporting the, Roof replacement shall include the removal of existing layers of, Flashings shall be reconstructed in accordance with. Thermoset single-ply roofs shall be installed in accordance with this chapter and the manufacturer's instructions. Asphalt shingles shall be fastened to solidly sheathed decks. Asphalt shingles shall meet the classification requirements of Table R905.2.4.1 for the appropriate ultimate design wind speed. Copper, brass, bronze, copper alloy and 300-series stainless steel fasteners shall be used for copper roofs. 26 gage [0.019 inches (0.5 mm)] corrosion-resistant sheet metal and shall extend 10 inches (254 mm) from the centerline each way for roofs having, Each bundle of shingles shall be identified by a. The installation of thermoplastic single-ply roofing shall comply with the provisions of this section. Asphalt shingle packaging shall bear a. Mineral-surfaced roll roofing shall be fastened to solidly sheathed roofs. Asphalt shingles shall be tested in accordance with ASTM D7158. Asphalt shingles shall be fastened to solidly sheathed decks. Fifteen-inch (381 mm) or 18-inch (457 mm) wood shakes shall be permitted to be used for the final course at the. Slate shingles shall be installed in accordance with this chapter and the manufacturer's instructions. 1. Drip edges shall extend not less than. Slate shingles shall be secured to the roof with two fasteners per slate. Terne coating of 40 lb per double base box, field painted where applicable in accordance with, 0.027 inch minimum thickness: 99.995% electrolytic high-, ASTM D6162; D6163; D6164; D6222; D6223; D6298, As an alternative, self-adhering polymer-modified bitumen, As an alternative, a minimum 4-inch-wide (102 mm) strip of self-adhering polymer-modified bitumen membrane complying with ASTM D1970, installed in accordance with the, The cap nail shank shall be not less than 0.083 inch (2.11 mm) for ring shank cap nails and 0.091 inch (2.31 mm) for smooth shank cap nails. The installation of slate shingles shall comply with the provisions of this section. The installation of wood shingles shall comply with the provisions of this section. 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. A liquid-applied protective coating that complies with Table R905.14.3 shall be applied not less than 2 hours nor more than 72 hours following the application of the foam. Htt4 & -`P .+Yn0a|bZN4U+yX*iNFk $ Slate shingles shall be secured to the roof with two fasteners per slate. Terne coating of 40 lb per double base box, field painted where applicable in accordance with, 0.027 inch minimum thickness: 99.995% electrolytic high-, ASTM D6162; D6163; D6164; D6222; D6223; D6298, As an alternative, self-adhering polymer-modified bitumen, As an alternative, a minimum 4-inch-wide (102 mm) strip of self-adhering polymer-modified bitumen membrane complying with ASTM D1970, installed in accordance with the, The cap nail shank shall be not less than 0.083 inch (2.11 mm) for ring shank cap nails and 0.091 inch (2.31 mm) for smooth shank cap nails. Same as Maximum Ultimate Design Wind Speed, 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. Thermoset single-ply roofs shall be installed in accordance with this chapter and the manufacturer's instructions. Materials and methods of application used for recovering or replacing an existing, The structural roof components shall be capable of supporting the, Flashings shall be reconstructed in accordance with, Chapter 9 addresses the design and construction of, R902.2 Fire-Retardant-Treated Shingles and Shakes, R902.3 Building-Integrated Photovoltaic Product, R902.4 Rooftop-Mounted Photovoltaic Panel Systems, R903.4.1 Secondary (Emergency Overflow) Drains or Scuppers, R904.3 Material Specifications and Physical Characteristics, Section R905 Requirements for Roof Coverings, R905.2.4.1 Wind Resistance of Asphalt Shingles, R905.14 Sprayed Polyurethane Foam Roofing, R905.17 Building-Integrated Photovoltaic (BIPV) Roof Panels Applied Directly to the Roof Deck, Section R907 Rooftop-Mounted Photovoltaic Panel Systems, R907.1 Rooftop-Mounted Photovoltaic Panel Systems, Building-integrated photovoltaic products. The bottom layer shall be 18 inches (457 mm) and the top layer not less than 36 inches (914 mm) wide. Slate shingles shall be installed in accordance with this chapter and the manufacturer's instructions. Base flashing against a vertical sidewall shall be continuous or step flashing and shall be not less than 4 inches (102 mm) in height and 4 inches (102 mm) in width and shall direct water away from the vertical sidewall onto the roof or into the gutter. Modified bitumen roofing shall comply with the standards in Table 905.11.2. 3. %PDF-1.6 % General Re-Roof Requirements . A new Footnote j 2 RESIDENTIAL ROOFING GUIDE 2018 IRC. satisfy the requirements of 2021 IBC Section 1512, 2018 and 2015 IBC Section 1511, 2012, 2009 and 2006 IBC Section 1510, 2018 and 2021, 2018 and 2015 IRC Section R908 or 2012, 2009 or 2006 IRC Section R907. IRC Section 301.3 Story Height: The ability is restored to construct a story of a dwelling using 12-foot high bearing walls if the wall studs are engineered for gravity loads, wall bracing amounts are increased, and a roof or celling diaphragm provides support to the studs. Install a two-layer #30 felt underlayment system. Valley linings of the following types shall be permitted: For SI: 1 inch = 25.4 mm, 1 pound = 0.454 kg. Self-adhering polymer-modified bitumen. About this chapter: Chapter 10 contains requirements for the construction, seismic reinforcing and anchorage of masonry chimneys and fireplaces; and establishes standards for the use and installation of factory-built chimneys, fireplaces and masonry heaters. Above-deck thermal insulation board shall comply with the standards in Table R906.2. Spray-applied polyurethane foam insulation shall comply with ASTM C1029, Type III or IV or ASTM D7425. Liquid-applied roofing shall have a design. For SI: 1 ounce per square foot = 0.305 kg/m. Valley linings shall be installed in accordance with the manufacturer's instructions before applying shingles. Wood shakes shall comply with the requirements of Table R905.8.5. Wood shakes shall be installed in accordance with this chapter and the, The starter course at the eaves shall be doubled and the bottom layer shall be either 15-inch (381 mm), 18-inch (457 mm) or 24-inch (610 mm) wood shakes or wood shingles. Where siding is provided on the vertical sidewall, the vertical leg of the flashing shall be continuous under the siding. Interlayment shall comply with ASTM D226, Type I. 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. Slate shingles shall be installed in accordance with this chapter and the manufacturer's instructions. 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 shakes shall comply with the requirements of Table R905.8.5. 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. R803.1 Lumber sheathing. The installation of asphalt shingles shall comply with the provisions of this section. In areas where there has been a history of ice forming along the eaves causing a backup of water as designated in. 2018 International Residential Code (IRC) COPYRIGHT PREFACE EFFECTIVE USE OF THE INTERNATIONAL RESIDENTIAL CODE arrow_right CHAPTER 1 SCOPE AND ADMINISTRATION arrow_right CHAPTER 2 DEFINITIONS arrow_right CHAPTER 3 BUILDING PLANNING arrow_right CHAPTER 4 FOUNDATIONS arrow_right CHAPTER 5 FLOORS arrow_right CHAPTER 6 WALL CONSTRUCTION arrow_right Minimum headlap for slate shingles shall be in accordance with Table R905.6.5. Spray-applied polyurethane foam insulation shall comply with ASTM C1029, Type III or IV or ASTM D7425. Install flashing at roof penetrations and wall intersections. Where siding is provided on the vertical sidewall, the vertical leg of the flashing shall be continuous under the siding. The installation of asphalt shingles shall comply with the provisions of this section. Above-deck thermal insulation board shall comply with the standards in Table R906.2.
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