2018 irc roof sheathing requirements

Valley linings of the following types shall be permitted: For SI: 1 inch = 25.4 mm, 1 pound = 0.454 kg. Table R803.1 is for roof sheathing which requires 5/8 plywood with rafters 24" o.c. 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. Liquid-applied roofing shall have a design. Stainless steel fasteners are acceptable for metal roofs. Asphalt shingles shall be fastened to solidly sheathed decks. Base and cap flashing shall be installed in accordance with manufacturer's instructions. Install flashing at roof penetrations and wall intersections. 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. Asphalt shingle packaging shall bear a. Mineral-surfaced roll roofing shall conform to ASTM D 3909 or ASTM D 6380, Class M. Mineral-surfaced roll roofing shall be installed in accordance with this chapter and the manufacturer's instructions. 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. 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. 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. The installation of mineral-surfaced roll roofing shall comply with this section. The installation of thermoplastic single-ply roofing shall comply with the provisions of this section. Valley linings shall be installed in accordance with the manufacturer's instructions before applying shingles. 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 modified bitumen roofing shall comply with the provisions of this section. Liquid-applied roofing shall have a design. 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. R803.1 Lumber sheathing. 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) The 2018 IRC specifies the ratios based on climate zone. Paint systems in accordance with ASTM A 755 shall be applied over steel products with corrosion-resistant coatings complying with ASTM A 792, ASTM A 875, ASTM A 463, or ASTM A 653. Asphalt shingles shall be used only on roof slopes of two units vertical in 12 units horizontal (2:12) or greater. For SI: 1 ounce per square foot = 0.305 kg/m. (914 mm). 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. 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. General Re-Roof Requirements . R905.2.1 Sheathing requirements. 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. For SI: 1 foot = 304.8 mm; 1 mile per hour = 0.447 m/s. Asphalt shingles shall be used only on roof. ASTM B209, 0.024 minimum thickness for roll-formed panels and 0.019-inch minimum thickness for pressformed shingles. Brace gable end walls taller than 48. inches in height to resist wind forces by installing a framing assembly at each gable wall stud. Slate shingles shall be secured to the roof with two fasteners per slate. 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. Slate shingles shall be fastened to solidly sheathed roofs. The installation of asphalt shingles shall comply with the provisions of this section. Where siding is provided on the vertical sidewall, the vertical leg of the flashing shall be continuous under the siding. Galvanized fasteners shall be used for steel roofs. Roof valley flashing shall be not less than No. 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. 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. Above-deck thermal insulation board shall comply with the standards in Table R906.2. Asphalt shingles shall be fastened to solidly sheathed decks. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). 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. Slate shingles shall be secured to the roof with two fasteners per slate. Please see IRC Sec- Where required, ice barriers shall comply with Section 905.1.2. Rooftop-mounted photovoltaic systems shall be installed in accordance with the manufacturer's instructions. 0 Section R901 General R901.1 Scope The provisions of this chapter shall govern the design, materials, construction and quality of roof assemblies. Slate shingles shall be secured to the roof with two fasteners per slate. Asphalt shingles shall meet the classification requirements of Table R905.2.4.1 for the appropriate ultimate design wind speed. Modified bitumen roofing shall comply with the standards in Table R905.11.2. For SI: 1 foot = 304.8 mm; 1 mile per hour = 0.447 m/s. 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. Wood shakes shall comply with the requirements of Table R905.8.5. If re-roofing over wood shingle, or wood shake roofs, additional code requirements may apply. Built-up roofs shall be installed in accordance with this chapter and the manufacturer's instructions. Built-up roofs shall be installed in accordance with this chapter and the manufacturer's instructions. 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. Thermoplastic single-ply 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. 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. Galvanized fasteners shall be used for steel roofs. 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. 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. Asphalt shingles shall comply with ASTM D3462. Self-adhering polymer-modified bitumen. Spray-applied polyurethane foam insulation shall comply with ASTM C1029, Type III or IV or ASTM D7425. Spray-applied polyurethane foam insulation shall comply with ASTM C1029, Type III or IV or ASTM D7425. 2015 IRC portion of the 2018 CT State Building Code, Part III Building Planning and Construction, R907 Rooftop-Mounted Photovoltaic Systems, R909 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 Recommended Procedure for Worst-Case Testing of Atmospheric Venting Systems Under N1102.4 or N1105 Conditions 5ACH, Appendix U Solar-Ready ProvisionsDetached One- And Two-Family Dwellings, Multiple Single-Family Dwellings (Townhouses), Appendix V Wind Speeds, Seismic Design Categories and Ground Snow Loads, 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, For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, In areas where there has been a history of ice forming along the eaves causing a backup of water as designated in. The 2020 Minnesota Residential Code adopts the 2018 International Residential Code (IRC). 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. Htt4 & -`P .+Yn0a|bZN4U+yX*iNFk $ Galvanized fasteners shall be used for steel roofs. Self-adhering polymer-modified bitumen. DEWALT Building Code Reference: Based on the 2018 International Residential Code | Books & Magazines, Textbooks, Education & Reference, Dictionaries & Reference | eBay! Fifteen-inch (381 mm) or 18-inch (457 mm) wood shakes shall be permitted to be used for the final course at the. The installation of liquid-applied 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. Valley and flashing metal shall be a minimum uncoated thickness of 0.0179-inch (0.5 mm) zinc coated G90. 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. The installation of wood shakes shall comply with the provisions of this section. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). Asphalt shingles shall comply with ASTM D3462. 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. 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. Slate shingles shall comply with ASTM C 406. Valley linings shall be installed in accordance with the manufacturer's instructions before applying shingles. . Mineral-surfaced roll roofing shall be fastened to solidly sheathed roofs. Foamed-in-place roof insulation shall be installed in accordance with this chapter and the manufacturer's instructions. Sprayed polyurethane foam roofs shall have a design. 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. For open valleys, valley lining of two plies of mineral-surfaced roll roofing, complying with ASTM D 3909 or ASTM D 6380 Class M, shall be permitted. 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. Allowable spans for lumber sheathing shall conform to IRC Table R803.1. Mineral-surfaced roll roofing shall not be applied on roof. The installation of wood shingles shall comply with the provisions of this section. Slate shingles shall be installed in accordance with this chapter and the manufacturer's instructions. 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. hb```g``:AX,;nkga3l~/ * 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 sprayed polyurethane foam roofing shall comply with the provisions of this section. Valley and flashing metal shall be a minimum uncoated thickness of 0.0179-inch (0.5 mm) zinc coated G90. The installation of wood shingles shall comply with the provisions of this section. Valley linings shall be installed in accordance with the manufacturer's instructions before applying shingles. Asphalt shingles shall be tested in accordance with ASTM D7158. 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. 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. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). Foam plastic materials and installation shall comply with. The installation of liquid-applied roofing shall comply with the provisions of this section. 233 0 obj <>/Filter/FlateDecode/ID[<4D23A6406EEE004484C52F82EDD55E2A>]/Index[201 60]/Info 200 0 R/Length 141/Prev 323429/Root 202 0 R/Size 261/Type/XRef/W[1 3 1]>>stream The bottom layer shall be 18 inches (457 mm) and the top layer not less than 36 inches (914 mm) wide. 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. Slate shingles shall be fastened to solidly sheathed roofs. 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. Foamed-in-place roof insulation shall be installed in accordance with this chapter and the manufacturer's instructions. The installation of wood shakes 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. R905.2Asphalt shingles. Adjacent segments of drip edge shall be overlapped not less than 2 inches (51 mm). Thermoset single-ply roofs shall be installed in accordance with this chapter and the manufacturer's instructions. 2 RESIDENTIAL ROOFING GUIDE 2018 IRC. 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. arrow_right. 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. 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. Thermoset single-ply roofs shall be installed in accordance with this chapter and the manufacturer's instructions. Thermoplastic single-ply roofs shall be installed in accordance with this chapter and the manufacturer's instructions.

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