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- 2018 irc roof sheathing requirements
2018 irc roof sheathing requirements
Copper, brass, bronze, copper alloy and 300-series stainless steel fasteners shall be used for copper roofs. Foamed-in-place roof insulation shall be installed in accordance with this chapter and the manufacturer's instructions. A new Footnote j Liquid-applied roofing shall have a design. For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mile per hour = 0.447 m/s. Where the existing roof has two or more applications of any type of roof covering. 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. The installation of slate shingles shall comply with the provisions of this section. R905.2.1 Sheathing requirements. Modified bitumen roofing shall comply with the standards in Table R905.11.2. Asphalt shingles shall comply with ASTM D3462. 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. 2018 irc roof sheathing requirements. Thermoset single-ply roofs shall be installed in accordance with this chapter and the manufacturer's instructions. 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. Galvanized fasteners shall be used for steel roofs. Mineral-surfaced roll roofing shall not be applied on roof. The installation of mineral-surfaced roll roofing shall comply with this section. Valley and flashing metal shall be a minimum uncoated thickness of 0.0179-inch (0.5 mm) zinc coated G90. Section R803 Roof Sheathing R803.2 Wood Structural Panel Sheathing (Roof Online Note: This subsection covers plywood and OSB sheathing. 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. Valley and flashing metal shall be a minimum uncoated thickness of 0.0179-inch (0.5 mm) zinc coated G90. Minimum headlap for slate shingles shall be in accordance with Table R905.6.5. 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 base sheet that complies with the requirements of. Slate shingles shall be secured to the roof with two fasteners per slate. Fifteen-inch (381 mm) or 18-inch (457 mm) wood shakes shall be permitted to be used for the final course at the. Asphalt shingles shall be used only on roof. 2 RESIDENTIAL ROOFING GUIDE 2018 IRC. Asphalt shingles shall be used only on roof. Thermoset single-ply roofs shall be installed in accordance with this chapter and the manufacturer's instructions. Sprayed polyurethane foam roofs shall have a design. 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 installation of thermoset single-ply roofing shall comply with the provisions of this section. ASTM B209, 0.024 minimum thickness for roll-formed panels and 0.019-inch minimum thickness for pressformed shingles. Foamed-in-place roof insulation shall be installed in accordance with this chapter and the manufacturer's instructions. arrow_right. 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. Thermoset single-ply roofs shall be installed in accordance with this chapter and the manufacturer's instructions. Allowable spans for lumber used as roof sheathing shall conform to Table R803.1. The installation of slate shingles shall comply with the provisions of this section. R905.2.1 Sheathing requirements. For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mile per hour = 0.447 m/s. 2. %%EOF Foamed-in-place roof insulation shall be installed in accordance with this chapter and the manufacturer's instructions. Stainless steel fasteners are acceptable for metal roofs. Foam plastic materials and installation shall comply with. A base sheet that complies with the requirements of. Same as Maximum Ultimate Design Wind Speed, Apply in accordance with the manufacturer's, Asphalt-saturated and asphalt-coated organic felt base sheet, Asphalt-saturated organic felt (perforated), Coal-tar primer used in roofing, dampproofing and waterproofing, ASTM B 370 minimum 16 oz/sq ft and 12 oz/sq ft high-yield copper for metal-sheet, ASTM B 209, 0.024 minimum thickness for roll-formed panels and 0.019-inch minimum, 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-, As an alternative, self-adhering polymer-modified bitumen, The standard calculations contained in ASTM D 7158 assume Exposure Category B or C and. 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. roof sheathing, skylights, change of roof pitch, addition or relocation of mechanical units, or installation of heavier materials than were previously installed. The installation of mineral-surfaced roll roofing shall comply with this section. Install drip edges at eaves and rakes. 12 oz/sq ft for preformed metal shingle systems. 12 oz/sq ft for preformed metal shingle systems. %PDF-1.6 % 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. Self-adhering polymer-modified bitumen. 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. 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. Where siding is provided on the vertical sidewall, the vertical leg of the flashing shall be continuous under the siding. For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mile per hour = 0.447 m/s. The framing assembly incudes horizontal braces, vertical retrofit studs, and compression blocks. 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. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). Self-adhering polymer-modified bitumen. Wood shakes shall comply with the requirements of Table R905.8.5. 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. Liquid-applied roofing shall be installed in accordance with this chapter and the, Where required, an ice barrier shall comply with, 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. 12 oz/sq ft for preformed metal shingle systems. 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. Valley linings shall be installed in accordance with the manufacturer's instructions before applying shingles. Mineral-surfaced roll roofing shall not be applied on roof. Built-up roofs 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. 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 wood shingles 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. Roof Deck Requirements for Installation of Asphalt Shingles Technical . 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. Asphalt shingles shall comply with ASTM D3462. Galvanized fasteners shall be used for steel roofs. The bottom layer shall be 18 inches (457 mm) and the top layer not less than 36 inches (914 mm) wide. 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. In areas where there has been a history of ice forming along the eaves causing a backup of water as designated in. SECTION R802 WOOD ROOF FRAMING. The installation of thermoset single-ply roofing shall comply with the provisions of this section. 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. The lecture and activity format allows participants to discuss the changes, reasons for the changes, and answer knowledge review questions. Glenn 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. 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. 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. arrow_right. Slate shingles shall be secured to the roof with two fasteners per slate. Liquid-applied roofing shall comply with ASTM C836, C957, D1227, D3468, D6083, D6694 or D6947. (914 mm). For roofs that provide positive drainage, re-covering 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, The application of a new protective coating over an existing spray polyurethane foam roofing system shall be permitted without tear-off of existing, Where the existing roof has two or more applications of any type of. Copper, brass, bronze, copper alloy and 300-series stainless steel fasteners shall be used for copper roofs. Thermoset single-ply membrane roofs shall have a design. redundant requirements for stud nailing, and create consistency in the IRC for roof sheathing attachment. Mineral-surfaced roll roofing shall be fastened to solidly sheathed roofs. Interlayment shall comply with ASTM D226, Type I. Thermoplastic single-ply membrane roofs shall have a design. Modified bitumen roofs shall be installed in accordance with this chapter and the manufacturer's instructions. See Table R503.2.1.1 for minimum allowable panel thickness by span and load.) Underlayment for asphalt shingles, clay and concrete tile, metal roof shingles, mineral-surfaced roll roofing, slate and slate-type shingles, wood shingles, wood shakes and metal roof panels shall conform to the applicable standards listed in this chapter. 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. Drip edges shall extend not less than. The installation of slate shingles shall comply with the provisions of this section. Exception: Detached accessory structures not containing conditioned floor area. The bottom layer shall be 18 inches (457 mm) and the top layer not less than 36 inches (914 mm) wide. Table 1 shows an insulation ratio - the R-value on the top of the roof sheathing compared to the total R-value. Slate shingles shall be fastened to solidly sheathed roofs. 260 0 obj <>stream 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. Base and cap flashing shall be installed in accordance with manufacturer's instructions. Please see IRC Sec- 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. 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. The GAF VersaShield Fire-Resistant Roof Deck Protection may be placed under or over the counterbattens. 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, In areas where the average daily temperature in January is 25F (-4C) Asphalt shingles shall be used only on roof slopes of two units vertical in 12 units horizontal (2:12) or greater. The installation of mineral-surfaced roll roofing shall comply with this section. Minimum headlap for slate shingles shall be in accordance with Table 905.6.5. The installation of thermoplastic single-ply roofing shall comply with the provisions of this section. Valley flashing shall be not less than 15 inches (381 mm) wide. Valley linings of the following types shall be permitted: For SI: 1 inch = 25.4 mm, 1 pound = 0.454 kg. Spaced lumber decking CoL Refer to the manufacturer's technical bulletin regarding requirements for existing deck boards. Part III Building Planning and Construction, R907 Rooftop-Mounted Photovoltaic Panel Systems, Chapter 13 General Mechanical System Requirements, Chapter 14 Heating and Cooling Equipment and Appliances, Chapter 19 Special Appliances, Equipment and Systems, Chapter 22 Special Piping and Storage Systems, Chapter 37 Branch Circuit and Feeder Requirements, Chapter 39 Power and Lighting Distribution, Chapter 43 Class 2 Remote-Control, Signaling and Power-Limited Circuits, Appendix A Sizing and Capacities of Gas Piping, Appendix B Sizing of Venting Systems Serving Appliances Equipped With Draft Hoods, Category I Appliances and Appliances Listed for Use With Type B Vents, Appendix C Exit Terminals of Mechanical Draft and Direct-Vent Venting Systems, Appendix D Recommended Procedure for Safety Inspection of an Existing Appliance Installation, Appendix E Manufactured Housing Used as Dwellings, Appendix G Piping Standards for Various Applications, Appendix J Existing Buildings and Structures, Appendix T [RE] Solar-Ready ProvisionsDetached One- And Two-Family Dwellings and Townhouses, The provisions of this chapter shall govern the design, materials, construction and quality of, Roofs shall be covered with materials as set forth in Sections, Flashings shall be installed in a manner that prevents moisture from entering the wall and roof through joints in copings, through moisture permeable materials and at intersections with parapet, Flashings shall be installed at wall and roof intersections, wherever there is a change in roof, A cricket or saddle shall be installed on the ridge side of any, The requirements set forth in this section shall apply to the application of, ASTM D6380 Class M mineral-surfaced roll roofing. The installation of asphalt shingles shall comply with the provisions of this section. 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. Plywood is a wood structural panel covered in R803.2.2 which points you to R503.2.1.1 There is a lot of cross over between chapters 5, 6, and 8, so don't just go with the chapter titles of floor, wall, roof. The installation of sprayed polyurethane foam roofing shall comply with the provisions of this section. 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 the existing roof covering is slate, clay, cement or asbestos-cement tile. Built-up roofs shall be installed in accordance with this chapter and the manufacturer's instructions. Copper, brass, bronze, copper alloy and 300-series stainless steel fasteners shall be used for copper roofs. Wood shakes shall comply with the requirements of Table R905.8.5. 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. 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. 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. hbbd```b``3@$R&5d}"uA$$X ,>,rLYfH 2o2dbO C"=Vbz CHEX/#300 k 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 secured to the roof with two fasteners per slate. Where siding is provided on the vertical sidewall, the vertical leg of the flashing shall be continuous under the siding. Liquid-applied roofing shall be installed in accordance with this chapter and the manufacturer's instructions. Install a nominal 4-inch-wide roof deck flashing tape over all roof sheathing panel seams and cover with #30 felt or equivalent synthetic underlayment. Asphalt shingles shall be fastened to solidly sheathed decks. Asphalt shingles shall be used only on roof. The 4-inch-wide (102 mm) strips of self-adhering polymer-modified-bitumen membrane Part III Building Planning and Construction, Chapter 13 General Mechanical System Requirements, Chapter 14 Heating and Cooling Equipment and Appliances, Chapter 19 Special Appliances, Equipment and Systems, Chapter 22 Special Piping and Storage Systems, Chapter 37 Branch Circuit and Feeder Requirements, Chapter 39 Power and Lighting Distribution, Chapter 43 Class 2 Remote-Control, Signaling and Power-Limited Circuits, Appendix A Sizing and Capacities of Gas Piping, Appendix B Sizing of Venting Systems Serving Appliances Equipped With Draft Hoods, Category I Appliances and Appliances Listed for Use With Type B Vents, Appendix C Exit Terminals of Mechanical Draft and Direct-Vent Venting Systems, Appendix D Recommended Procedure for Safety Inspection of an Existing Appliance Installation, Appendix E Manufactured Housing Used as Dwellings, Appendix G Piping Standards for Various Applications, Appendix J Existing Buildings and Structures, Appendix T [RE] Solar-Ready ProvisionsDetached One- And Two-Family Dwellings and Townhouses, The provisions of this chapter shall govern the design, materials, construction and quality of, Roofs shall be covered with materials as set forth in Sections 904 and 905. 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. Where required, ice barriers shall comply with Section 905.1.2. Asphalt shingles shall be tested in accordance with ASTM D7158. Flashing and counterflashing shall be made with sheet metal. Class A, B or C roofing shall be installed in, Flashings shall be installed in a manner that prevents moisture from entering the wall and roof through joints in copings, through moisture permeable materials and at intersections with parapet, Flashings shall be installed at wall and roof intersections, wherever there is a change in roof, A cricket or saddle shall be installed on the ridge side of any, The requirements set forth in this section shall apply to the application of, ASTM D6380 Class M mineral-surfaced roll roofing. 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. 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, The 24 inch measurement shall be along the, Building-integrated photovoltaic products.