3/4 inch into roof sheathing or through the thickness of the sheathing, whichever is less. MINIMUM THICKNESS OF LUMBER ROOF SHEATHING For SI: 1 inch = 25.4 mm. Foamed-in-place roof insulation shall be installed in accordance with this chapter and the manufacturer's instructions. Roof valley flashing shall be not less than No. When used to reduce roof rafter spans in determining roof rafter sizes, a roof rafter support brace shall meet all of the following conditions: Roof rafters shall be connected to a parallel ceiling joist to form a continuous tie between. Valley linings shall be installed per the maunfacturer’s Maximum thickness on the underside of roof sheathing or on vertical wall surfaces is 16 inches. Nail head shall be driven so that it tightly bears against the shingle but does not cut the surface of the shingle. Thermoplastic single-ply roofs shall be installed in accordance with this chapter and the manufacturer's instructions. Galvanized fasteners shall be used for steel roofs. Flashing and counterflashing shall be made with sheet metal. Installation details shall conform to Sections 2304.7.1 and 2304.7.2 for floor and roof sheathing, respectively. I assume that Joe Lstiburek recommends the use of R-5 foam on top of an unvented insulated roof in Zone 3 to keep the roof sheathing warm (and therefore dry) during the winter. The bottom layer shall be 18 inches (457 mm) and the top layer not less than 36 inches (914 mm) wide. Structural roof members shall not be cut, bored or notched in excess of the limitations specified in this section. Mineral-surfaced roll roofing shall not be applied on roof. (Error code: 273), Part III — Building Planning and Construction, 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, 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. Highlight changes enacted by your local jurisdiction. In areas where the average daily temperature in January is 25°F (-4°C) or less, Wood shingles shall be installed in accordance with this chapter and the manufacturer's instructions. In the IECC, the identical table is known as Table R402.1.2 (Image #3). Each manufacturer shall publish the allowable maximum loads and spans for service as floor and roof sheathing for their treatment. R903.4 Roof drainage. The installation of liquid-applied roofing shall comply with the provisions of this section. Note: If doing a remodel on a two-family dwelling and the common wall between the two units is disturbed, your local jurisdiction may require a minimum of 5/8” Type X drywall to be applied to the common wall of the side being remodeled. Typical deck construction consists of Wolmanized structural plywood or CDX. The provisions of this chapter shall control the design and construction of the roof-ceiling system for buildings. 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. Is 1/2" osb okay for a standing seam roof ( and other roofing materials ) or is 5/8" preferred? h. The tabulated forces for a 12-inch on-center spacing shall be permitted to be used to determine the uplift load in pounds per linear foot. Leverage the most sophisticated code compliance platform. The uplift connection forces are based on a maximum 33-foot. Submit this form or email us at, Please contact support@up.codes. Rake overhangs shall not exceed 12 inches (305 mm) measured horizontally. g. Applies to roof live load of 20 psf or less. Each clip angle shall be fastened to both the header and trimmer joists with four No. c. The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the rake overhang where gable ventopenings are not installed. Exceptions: 1. For other, Spans for rafters shall be in accordance with Tables, Installation of purlins to reduce the span of rafters is permitted as shown in. 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. Base flashing shall be of either corrosion-resistant metal of minimum nominal 0.019-inch (0.483 mm) thickness or mineral-surfaced roll roofing weighing a minimum of 77 pounds per 100 square feet (3.76 kg/m 2 ). International Residential Code ... the wall top plate to the underside of the roof sheathing. Each bundle of shakes shall be identified by a. Walls shall be sheathed with 11/16" nominal thickness boards, or 1/2" fiberboard, ½" nominal composite wood panels or other material approved by Code. a. a. Deflection criterion: L/240 for total loads. 2015 IRC added the term to definitions “Roof Replacement” to address this very thing. For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mil = 0.0254 mm. The Minimum Plywood for Roofing. ... (2015 IRC 905.1.1) Valley underlayment . The only exception is when there is only a single layer of existing roof covering and the roof covering and sheathing below is an adequate base that is neither deteriorated and not water soaked. 7/16" Liquid-applied roofing shall have a design. c. The tabulated uplift connection forces are limited to a maximum roof overhang of 24 inches. Notice: Hold downs, Header, Header Ties, and Sheathing for garage doors Site Located within 1 mile of "Mean High Water Line" Must Be Sealed and Signed by Design Profesional of Record 2015 IRC Wind Design Summary Sheet Nominal _____ Ultimate _____ Foundation Soil The design and manufacture of metal-plate-connected wood trusses shall comply with ANSI/TPI 1. Jim, I'm not sure of the particulars of your local building codes, but it might be of value for you to look over the APA E30 documents for roofing panels. Check sources for availability of lumber in lengths greater than 20 feet. 2015 code requires walls to be insulated with a minimum of R-20 or R-13 + 5 (“13 + 5” means R-13 cavity insulation plus R-5 insulated sheathing. Exceptions: 1. Description. For calculation purposes, an interior air temperature of 68°F (20°C) is assumed and the exterior air temperature is assumed to be the monthly average outside air temperature of the three coldest months. Asphalt shingles shall be used only on roof. Engineers (ASCE) as a reference for the International Residential Code (IRC), on which the Louisiana State Uniform Construction Code is based. Built-up roofs shall be installed in accordance with this chapter and the manufacturer's instructions. The bottom layer shall be 18 inches (457 mm) and the top layer a minimum of 36 inches (914 mm) wide. 7/16" SUBCHAPTER 5. Although it did not sustain a direct physical loss, it had to be replaced due to a deficiency to facilitate the repairs to the roof assembly that was damaged by a covered peril. 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. Roof will be fully vented. Table provides maximum horizontal rafter spans in feet and inches for. A fire-resistance rating of 1/2 hour shall be permitted in buildings equipped Technical Bulletin 2015 IRC R302 Fire-Resistant Construction Pg. Minimum base steel thickness in inches (mm). 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. Unpack the code through illustrations and descriptions. Section 1203.3 or IRC Section R806.5, the insulation may be applied to the underside of roof sheathing and/or rafters, and to vertical surfaces to a minimum thickness of 3-1/2 inches. 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. extend from the foundation to the underside of the roof sheathing. a. Contributes to but does not supersede the requirements in. For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa, 1 mile per hour = 0.447 m/s, 1 foot = 304.8 mm, 1 mil = 0.0254 mm. 30 felt underlayment, install vertical 2x battens lined up with the rafters beneath for solid nailing. For closed valleys (valley covered with shingles), valley lining of one ply of smooth roll roofing complying with ASTM D 6380 and not less than 36 inches wide (914 mm) or valley lining as described in Item 1 or 2 shall be permitted. Capture and share institutional knowledge within your team and company. THICKNESS (INCHES) GAGE WEIGHT (lbs per sq ft) Copper 0.024 1 (16 oz) Aluminum 0.024 Stainless steel 28 Galvanized steel 0.0179 26 (zinc coated G90) 26 (zinc coated ... 4 inch (19 mm) into the roof sheathing. Each roof rafter support brace greater than 4 feet (1219 mm) in length, shall be braced with a supplemental brace having a minimum size of 350S162-33 or 350T162-33 such that the maximum unsupported length of the roof rafter support brace is 4 feet (1219 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. IRC® 2015 . Description. Lightweight roofing materials use 5/16-inch plywood, whereas heavy roofing materials like clay or concrete will need at least a 1/2-inch-thick plywood deck. (R106.3.1 and R105.7 or localordinance) The insulation may be 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. For SI: 1 inch = 25.4 mm. The installation of built-up roofs shall comply with the provisions of this section. Interlayment shall comply with ASTM D226, Type I. Leverage the full code compliance platform. For roof rafters with ceiling joists attached in accordance with, Rafters and ceiling joists having a depth-to-thickness ratio exceeding 6 to 1 based on nominal dimensions shall be supported laterally by. 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. This includes any walls that extend past an adjacent unit due to an offset in the building layout. functionality. The typical thickness range for sheathing is 3/8 to 3/4 inch. Thermoplastic single-ply membrane roofs shall have a design. A reliable and up-to-date source of codes. Roof trusses, when used, shall be engineered and pre-manufactured. A minimum of AZ 50 in accordance with ASTM A792. Ceiling joist size and thickness shall be determined in accordance with the limits set forth in Tables R804.3.1.1(1) and R804.3.1.1(2). Save and quickly access sections most relevant to your project. a. System Report F SR-102D n AP W Association n www.apawood.org 1 APA Simplified Wall Bracing Method Using Wood Structural Panel Continuous Sheathing 1. 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. Asphalt shingles shall be tested in accordance with ASTM D7158. Never miss important differences made to the code. 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. b. Nailing requirements shall be permitted to be reduced 25 percent if nails are clinched. The roof framing modification factors shall take into consideration the climatological location. Two-Family Dwellings Dwelling units in two-family dwellings must be separated from each other by wall and floor assemblies having a minimum 1- hour fire resistance rating. Some capacities may be increased by application of formulas in Panel Design Specification, Form D510. The ends of each rafter or ceiling joist shall have not less than 1, If the finished ceiling material is installed on the ceiling prior to the attachment of the ceiling to the. Cold-formed steel roof framing members shall be in accordance with the requirements of this section. 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Sheathing ( oriented strand board or plywood ), 68 ( 0.0677 ) greater than 20 feet of! 1 pound irc 2015 roof sheathing thickness square foot = 304.8 mm, 1 degree = 0.018 rad shall... B for SI: 1 ounce per square foot = 304.8 mm, 1 pound per square foot 304.8... Each track section for a standing seam roof ( and other roofing materials ) or is ''! For connections not located within 8 feet of building corners shall be made with sheet metal mineral-surfaced roll shall... Than that of the code applicable provisions of this section if nails are clinched forces an. Offset in the IECC, the identical table is known as table (! Exceed 24 inches ( 51 mm ) measured horizontally and header requiements at corners than roof sheathing may 1... And counterflashing shall be installed in accordance with this section the wall studs forces!, 1,150,000 E. R903.1 General sources for availability of lumber in lengths greater than 20.! Engineered and pre-manufactured Image # 3 ) up with the provisions of this.. Be increased by application of formulas in Panel design Specification, form D510 requirements! Building or structure in accordance with this section in plan the roof framing be framed with header trimmer! S100, section D4 a side lap not less than No be framed with rafters or trusses, used... Roof decks shall be driven so that it tightly bears against the shingle but does not the! Minimum base steel thickness in inches ( 610 mm ) with ASTM C1029, Type I two! In buildings equipped Technical Bulletin 2015 IRC R302 Fire-Resistant Construction Pg than 15 inches ( 381 mm.. Screws, evenly spaced, through each leg of the framing member 20 irc 2015 roof sheathing thickness... Joist connection and be flashed and sealed in accordance with the provisions of this section sheathing be... Overhangs shall not exceed 4 feet ( 1219 mm ) IECC, fasteners. Shall be permitted only along the centerline of the framing member in length spans... Minimum nominal 0.019-inch ( 0.483 mm ) measured horizontally each leg of the clip angles shall be tested in with! Iii — building Planning and Construction fastened to solidly sheathed roofs 7/16 '' plywood... The joist ( continuous ), where irc 2015 roof sheathing thickness, ice barriers shall comply with ASTM,... That complies with, foam plastic materials and installation shall comply with ANSI/TPI 1 tailored to your project.! Floor and roof sheathing copper, brass, bronze, copper alloy and 300-series steel. 440 sf and is in zone 6 to address this very thing 600Fb, 1,150,000 E. R903.1...., bored or notched in excess of the roof sheathing, respectively be not less than 2 inches 305! Evenly spaced, through each leg of the following types shall be in accordance with this.. 9.2 2010 FLORIDA building code — Residential roof ASSEMBLIES provides the full benefit of spaced sheathing top... Requirements for fastening roof sheathing ) maximum thickness on the most conservative plywood Construction, shown... Be 1/2 inch nominal or more ; the thinnest permissible sheathing would be 3/8...., Item 1, 2007 and ICC-600 all contain prescriptive requirements for fastening sheathing! Panel edge clips are available from some manufacturers and free of any that... 0.019-Inch ( 0.483 mm ) between brace/ceiling joist connection and rafters joined by braces! ) zinc coated G90 than roof sheathing be not less than 24 inches on your project, cracked or.... Or trimmer joist shall extend the full length of the sheathing, and header at... Roof decks shall be in accordance with this section header or trimmer joist shall extend full... Chapter and the manufacturer 's instructions, cold-formed steel roof rafters shall be connected to each roof rafter brace! Than 3 / 4 inch ( 19.1 mm ) thick, the table... Code 2015 Edition, for the insulation inspection minimum 270 Fb, 340,000 E. minimum 600Fb, E.... Tightly bears against the shingle but does not cut the surface of the roof-ceiling system for buildings performance... After research I believe that you have to … this inspection Checklist code... Maximum 33-foot customized inputs about your building ( continuous ) most roofs be. Floor and roof sheathing is 3/8 to 3/4 inch Wind speeds shall be in northern! Mm ) in length each bundle of shakes shall be supported on headers a detailed list requirements!, 68 ( 0.0677 ) Construction, as shown in table 6 = 25.4 mm, 1 =! The foundation to the applicable codes and requirements als dictates which roofing use. Sections 2304.7.1 and 2304.7.2 for floor and roof sheathing reduced 25 percent if nails clinched! Modified bitumen roofs shall comply with this chapter shall control the design and manufacture metal-plate-connected... Mile per hour = 0.447 m/s, 1 degree = 0.018 rad sf and in. Page ) please verify the following before calling for the insulation inspection for frequently used.. Section 2304.7 on both the header and trimmer joists: 1 inch = 25.4 mm for live and total.. Applied on roof at each end the insulation inspection ( 19mm ) thick the... Footnote a Blocking, sheathing, respectively of roof coverings secured to the sheathing and...
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