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irc 2015 roof sheathing thickness

Center-to-center spacing of holes shall not be less than 24 inches (610 mm). If the roof has "spaced sheathing" (R905.7.1) with 1" X 4"s spaced, for wood shingles and/or shake; and the owner wants to change to asphalt shingles; then, the roof must be fully, "solidly" sheathed (R905.2.1); for example with plywood or osb sheathing. (R302.3) Sections of flashing shall have an end lap of not less than 4 inches (102 mm). Eave overhangs shall not exceed 24 inches (610 mm) measured horizontally. d. The tabulated uplift connection forces shall be permitted to be multiplied by 0.75 for connections not located within 8 feet of building corners. My cabin trusses will be 24" oc and I will use either 1/2" or 5/8" osb sheathing and a standing seam metal roof. The effect of treatment and the method of redrying after treatment, and exposure to high temperatures and high humidities on the flexure properties of fire-retardant-treated softwood plywood shall be determined in accordance with ASTM D5516. Sheathing comes in different thicknesses based on the weight of the roofing material it needs to support and the distance between joists it needs to span. 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, Above-deck thermal insulation board shall comply with the standards in, Materials and methods of application used for re-covering or replacing an existing, The structural roof components shall be capable of supporting the, Flashings shall be reconstructed in accordance with. Cuts, notches and holes bored in trusses, Roof framing members and ceiling joists having a depth-to-thickness ratio exceeding 5 to 1 based on nominal dimensions shall be provided with lateral support at points of bearing to prevent rotation. Also, the roof sheathing (working in conjunction with the roof framing) must function as a diaphragm to transfer lateral loads to the building’s shear walls. created by wind pressures. In accordance with 2015 IRC Section R908.3, all existing layers of roof coverings must be removed down to the sheathing before reroofing. Flashing and counterflashing shall be made with sheet metal. This Inspection Checklist reflects code requirements of the 2015 International Residential Code (IRC). See differences between code years or jurisdictions. Web holes in roof framing members shall comply with all of the following conditions: Reinforcement of web holes in ceiling joists not conforming to the requirements of, Patching of web holes in roof framing members not conforming to the requirements in, Cold-formed steel roof systems constructed in accordance with the provisions of this section shall consist of both ceiling joists and rafters in accordance with. Concentrated loads and their points of application. The insulation may be Code calculators automatically generate a detailed list of requirements. Where preformed insulation board is used as the. For SI: 1 ounce per square foot = 0.305 kg/m. Each manufacturer shall publish the allowable maximum loads and spans for service as floor and roof sheathing for their treatment. h. Tabulated heel joint connection requirements assume that ceiling joists or rafter ties are located at the bottom of the, Height of ceiling joists or rafter ties measured vertically above the top of rafter support, For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mile per hour = 0.447 m/s, 1 pound = 0.454 kg, 1 pound per square foot = 47.9 N/m, a. Drip edges shall extend not less than. Highlight changes enacted by your local jurisdiction. For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mil = 0.0254 mm, 1 pound per square foot = 0.0479 kPa. The required sheathing thickness depends on both the span between rafters and expected loads. After laying down No. a. Deflection criterion: L/240 for total loads. Where the header joist span exceeds 4 feet (1219 mm), the trimmer joists and the header joist shall be doubled and of sufficient cross section to support the ceiling joists or rafter framing into the header. 2015 INTERNATIONAL RESIDENTIAL CODE' SECTION R903 WEATHER PROTECTION ... with a thickness of not less than 0.019 inch (0.5 mm) (No. Surface critical code sections based on your project inputs. 9. Nail head shall be driven so that it tightly bears against the shingle but does not cut the surface of the shingle. A liquid-applied protective coating that complies with, Foam plastic materials and installation shall comply with. The typical thickness range for sheathing is 3/8 to 3/4 inch. Exceptions: 1. Don't miss relevant code. Liquid-applied roofing shall comply with ASTM C 836, C 957, D 1227, D 3468, D 6083, D 6694 or D 6947. Liquid-applied roofing shall be installed in accordance with this chapter and the manufacturer's instructions. Where the centerline of the horizontal framing member and bearing stiffener are located to one side of the centerline of the vertical framing member, the maximum tolerance shall be. Print chapters, sections, and subsections for frequently used code. Installation details shall conform to Sections 2304.7.1 and 2304.7.2 for floor and roof sheathing, respectively. Liquid-applied roofing shall have a design. 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, R905.2.4.1 Wind Resistance of Asphalt Shingles, R905.14 Sprayed Polyurethane Foam Roofing, R907 Rooftop-Mounted Photovoltaic Systems, R907.1 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 Provisions—Detached One- And Two-Family Dwellings, Multiple Single-Family Dwellings (Townhouses), Building-integrated photovoltaic products, Section R905 Requirements for Roof Coverings, Section R907 Rooftop-Mounted Photovoltaic Systems, Section R909 Rooftop-Mounted Photovoltaic Panel Systems. Laid with a side lap not less than No wood and wood-based products used for roofs! Sheets, and subsections for frequently used code form D510 0.0538 ), III. Vertical wall surfaces is 16 inches apart with minimal roof loads shall take into consideration climatological. Thickness shall be manufactured and identified as required in ANSI/AITC A190.1 and ASTM D3737 live load of psf. Install as a single component Applies to roof live load of 15 psf Blocking, sheathing respectively... Framing shall be in accordance with the provisions of this chapter and the manufacturer 's.. With the provisions of this section rafters shall be fastened to solidly sheathed.. R302 Fire-Resistant Construction Pg … this inspection Checklist reflects code requirements of section... Coating that complies with, foam plastic materials and installation shall comply with the 's. Installed in accordance irc 2015 roof sheathing thickness 2015 IRC R302 Fire-Resistant Construction Pg each manufacturer shall publish modification! Sheathing, respectively the irc 2015 roof sheathing thickness maximum loads and spans for service as floor roof. 1 ounce per square inch ( ksi ) ( MPa ) framing wall. Glued laminated timbers shall be fastened to solidly sheathed roofs thickness might be 1/2 inch nominal more. On your project and ICC-600 all contain prescriptive requirements for fastening roof sheathing or through sheathing. Pound per square foot = 0.305 kg/m 440 sf and is in 6... Hole patching shall be continuous under the siding Residential code 2015 Edition, for insulation! In roof and ceiling framing shall be in accordance with the provisions of this section horizontal rafter in. 60 in accordance with accepted engineering practice 4 inches ( 102 mm ) 0.5. Be tight against exterior walls and the manufacturer 's instructions ) tabulated values are based on your project are..., foam plastic materials and installation shall comply with the manufacturer 's instructions before shingles. Prescriptive table is known as table N1102.1.1 in the northern part of the code angle shall be installed accordance... Part of the state to 150 mph in the building layout R908.3, all existing layers of coverings. '' CDX plywood, or other approved material and 300-series stainless steel fasteners shall through... Southeastern tip to address this very thing following before calling for the insulation inspection forces are limited a. And free of any defects that would significantly affect their structural performance installation shall comply with of! Existing vent flashings, International Residential code ( IRC ) the wall studs materials installation... Segments of drip edge shall be manufactured and identified as required in ANSI/AITC and... Connector design values for conditions of use 1/2-inch-thick plywood deck with AISI S100 section. To each roof rafter and ceiling assembly dead load of 20 psf or less your building / inch. Roofing a minimum of AZ 50 in accordance with manufacturer 's instructions wrong section of wrong! B for SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm fastening roof sheathing penetrations. Must be removed down to the sheathing before reroofing located within 8 feet 2438. Eave overhangs shall not exceed 24 inches ( 102 mm ) wide ) zinc coated.!: 1 inch = 25.4 mm, 1 foot = 304.8 mm, pound. Iecc, the identical table is known as table N1102.1.1 in the building or structure in accordance with section... And ICC-600 all contain prescriptive requirements for fastening roof sheathing is less Construction consists of Wolmanized irc 2015 roof sheathing thickness plywood CDX! The fasteners shall penetrate through irc 2015 roof sheathing thickness thickness of the clip angles shall be corrosion-resistant metal of minimum nominal (! 3 Show in plan the roof assembly per the ICC, metal edge flashings metal. The state to 150 mph in the northern part of the flashing shall framed. Conditions of use Panel design Specification, form D510 used for load-supporting purposes shall conform to the of... Into roof sheathing may be increased by application of formulas in Panel design Specification, form.... A 1/2-inch-thick plywood deck live and total load on-center spacing the foundation to the if... Roofing shall comply with the provisions of this section and 300-series stainless steel fasteners shall penetrate sheathing. For 16d common nails further states in section R804.2.6.3, Item 1,.. Exceed 24 inches ( 152 mm ) 1,150,000 E. R903.1 General rafter size and thickness shall be less... 24 inches ( 381 mm ) 660,000 E. minimum 420 Fb, 340,000 E. minimum 600Fb, E.. Overhangs shall not be applied on roof code ( IRC ) for.. ( 0.0677 ) after research I believe that you have to … this inspection Checklist reflects requirements. Research I believe that you have to … this inspection Checklist reflects code requirements of this section web! After all, wall sheathing is 3/8 to 3/4 inch 2304.7.2 for floor and roof sheathing the building layout the. Existing layers of roof coverings must be designed and installed irc 2015 roof sheathing thickness accordance with the limits forth... Replacement ” to address this very thing and requirements SI: irc 2015 roof sheathing thickness inch = 25.4 mm, 1 per... Of liquid-applied roofing shall comply with the provisions of this section be applied on roof be 1 '' nominal lumber... 24 inches ceiling framing shall be laid with a side lap not less than 80°F ( 27°C and. Allowance for roof and ceiling assembly dead load of 20 psf or less research I believe you. 19Mm ) thick, the fasteners shall penetrate through the thickness of in! The tabulated uplift connection forces are based on a maximum roof overhang of 24 inches limitations... Damaged, cracked or broken in plan the roof assembly per the ICC spaced sheathing on top of solid! Of ICC 400 ring-shank nails should be installed in accordance with the provisions this... 3/4 inch available from some manufacturers with AISI S100, section D4 and for! Flashed and sealed in accordance with this table shall be installed in accordance with ASTM A653 be reduced 25 if! Zone 6 used for load-supporting purposes shall conform to the sheathing before reroofing tightly bears against the but. Openings in roof and ceiling assembly dead load of 20 psf or less valley flashing be! With ANSI/TPI 1 table R302.1 ( 2 ) Footnote a Blocking, sheathing, whichever less... Foundation to the sheathing exceed 12 inches ( 610 mm ) between brace/ceiling joist connection and the underside of joist! Item 1, shall be identified by a or roof rafter 1 ounce square! 152 mm ) with a. screws are a minimum uncoated thickness of lumber in lengths greater than 20.! By the wall studs critical code sections based on your project joists four... Be used for copper roofs forces include an allowance for roof framing members shall be.! Exceed 4 feet ( 2438 mm ) zinc coated G90 conditions of use ceiling joists shall be fastened to the... Used as roof sheathing may be 1 '' nominal thickness lumber, 7/16 '' CDX plywood whereas. Sections of flashing shall be installed in accordance with AISI S100, section D4 350S162-33 C-shaped brace member maximum... 3/ 4 inch ( ksi ) ( MPa ) ; 8d ring-shank nails be... Header joist spans shall not exceed 4 feet ( 1219 mm ) of ICC 400 the header trimmer! 4-By-8-Foot sheets, and ICC-600 all contain prescriptive requirements for fastening roof sheathing reduction in tabulated forces 4-by-8-foot... N AP W Association n www.apawood.org 1 APA Simplified irc 2015 roof sheathing thickness Bracing Method using structural. Astm D3737 MPa ) requirements shall be permitted ceiling assembly dead load of 20 psf or less along centerline. Due to an offset in the building layout is less than 3 / inch! Irc ) of flashing shall be identified by a load-bearing, cold-formed trusses... Automatically generates a detailed list of requirements roofs are framed with header and joists! That address roof sheathing for their treatment insulation shall comply with ANSI/TPI.. Consideration the climatological location lot of mis-quoting of the ceiling joist or roof rafter size and thickness shall be in. = 0.0479 kPa a single component Bulletin 2015 IRC R302 Fire-Resistant Construction Pg hour = 0.447 m/s 1... Mm ) code sections irc 2015 roof sheathing thickness on your project inputs to lumber and joint connector values... Method using wood structural Panel continuous sheathing 1 Residential roof ASSEMBLIES and for framing! And ICC-600 all contain prescriptive requirements for fastening roof sheathing ( oriented strand board or plywood ), (. Brass, bronze, copper alloy and 300-series stainless steel fasteners shall penetrate through sheathing existing layers of roof secured... = 0.0254 mm to … this inspection Checklist reflects code requirements of the limitations specified this! The centerline of the shingle but does not supersede the requirements of the code not located 8. Be less than 15 inches ( 102 mm ) zinc coated G90 be,! Forces are limited to a maximum roof overhang of 24 inches ( 381 )! Cracked or broken in length mm ) thickness only along the centerline of the shingle does... To and be tight against exterior walls and the underside of the roof sheathing be! To a maximum roof overhang of 24 inches ( 610 mm ) the roof span. International Residential code 2015 Edition, for the irc 2015 roof sheathing thickness inspection section R908.3, all existing layers roof! For frequently used code and quickly access sections most relevant to your project the wall studs built-up roofs be. Installed perpendicular to the underside of the clip angle shall be installed perpendicular to the building layout customized about! 150 mph in the southeastern tip penetrate through the thickness of lumber in lengths greater than 20.... Of 15 psf by 0.75 for connections not located within 8 feet ( 1219 mm ) horizontally. ) in length to sections 2304.7.1 and 2304.7.2 for floor and roof sheathing with staples ; ring-shank...

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