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roof sheathing thickness code

MINIMUM THICKNESS OF LUMBER ROOF SHEATHING. See Table R503.2.1.1 for minimum allowable panel thickness by span and load.) Where the roofsheathingislessthan 3/ 4 inch(19mm)thick,thefasteners Always Check for a Level Nailing Surface. Spaced lumber sheathing is not allowed in Seismic Design Category D 2. However, there IS a common reason to upgrade the thickness of the roof sheathing as explained above. Roof sheathing comes in grid-marked 4-by-8-foot sheets, and should be installed perpendicular to the frame. Exception: As an alternative, adhered underlayment complying with ASTM D … If your local building authority has a rafter-spacing code, you may not space rafters wider than required by code. 4101:8-9-01 Roof assemblies. The requirement became effective on October 1, 2007. 2. Never attach roof sheathing with staples; 8d ring-shank nails should be used instead. For rafters spaced 20 or more inches apart, 1/2- or 5/8-inch plywood is recommended. If asphalt shingles are installed over sheathing with gaps exceeding 1/4-inch, over time, these gaps may telegraph through and become visible. Rapidly and efficiently calculate project parameters. B. Holes drilled in roof sheathing for ventilation – roof diaphragm action is maintained. Common roof sheathing applications and installation recommendations are described in the related publications listed at right. What H-Clips Do. or Less Roof Fastening Zone Wind Main Sheathing-to-Gable- Overhang Velocity Roof End-Wall Framingg (eaves) (3-Second Panel 123 2 3 2 3 Roof Sheathing Panel Spacing Hints: Use a 10d box (0.128-inch-by-3-inch) nail as a spacer to gauge 1/8-inch edge and end spacing between panels. Ladder Framing at Gable Ends Use extra care when attaching a ladder-framed exten - sion to a gable end. 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. A reliable and up-to-date source of codes. Kimberly Hawthorne has been writing since 1980, currently contributing to various websites. Code calculators automatically generate a detailed list of requirements. H-clips provide additional stiffness between bearing points for the unsupported edges of wood panel (plywood or OSB) roof sheathing, along with the necessary 1/8” gap for expansion, as shown below illustrated on a bag of Simpson H-clips. (Also, if you use the IRC for anything in your local area take a look at the table 503.2.1.1 and see if that helps.) Floor and roof sheathing conforming with this table shall be deemed to meet the design criteria of Section 2304.7. or Table 9.23.15.7.B. And if you're still wondering what roof sheathing is and what materials are typically used, read on and satisfy your curiosity. Thickness, Rating and Material Standards (1) Where wall sheathing is required for the purpose of complying with this Section, it shall conform to Table 9.23.16.2.A. ¾ plywood is a favorite for some as … or Table 9.23.16.2.B. At my expense of course. Hunker may earn compensation through affiliate links in this story. Allowable spans for lumber used as roof sheathing shall conform to Table R803.1. The most common rafter spacing is 24 inches, and 5/8-inch plywood is recommended for that. Section R802 Wood Roof Framing. Roof sheathing attaches to the surface of the rafters or trusses to form the structural skin of the roof. Roof sheathing conforming to the provisions of Table 2304.7(1) , 2304.7 (2), 2304.7 (3) or 2304.7 (5) shall be deemed to meet the requirements of this section. For information on large panelized roof systems, refer to the Commercial Construction application section. Building Codes for roofing reqiure a minimum 1x4, and the spaces between battens should not exceed 3 1/2 inches (Figure 2-46 - wood shingles over spaced sheathing, and Figure 2-47 wood shakes installed over wood sheathing are illustrated below). Cap nail shank shall have a length sufficient to penetrate through the roof sheathing or not less than 3/4 inch into the roof sheathing. R803.2 Wood Structural Panel Sheathing (Roof Online Note: This subsection covers plywood and OSB sheathing. Sheets of 7/16-inch thick, with no edge support, can be used in an area where the snow load is 30 pounds per square foot. o.c. Tool Base: What is the Minimum Thickness of OSB for Roof Sheathing. What H-Clips Do. Section R801 General. ICC Digital Codes is the largest provider of model codes, custom codes and standards used worldwide to construct safe, sustainable, affordable and resilient structures. Section R802 Wood Roof Framing. Many homes have been severely Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of Section 2304.7. Unless noted otherwise in this information bulletin, a building permit is not required for renewal of roof coverings on any building permitted by the California Building Code and the California Residential Code, where the existing roof structure, including roof Several factors must be considered when determining appropriate roof sheathing thickness, such as the span of roof joists and snow load for the area. This will give you the total number of sheets to buy. [Comment: When a reference is made within this rule to a federal statutory provision, an industry consensus standard, or any other technical publication, the specific date and title of the publication as well as the name and address of the promulgating agency are listed in rule 4101:8-44-01 of the Administrative Code. non-structural and are discussed in detail in Chapter 8, Roof Covering and Best Practices. Unpack the code through illustrations and descriptions. SECTION 1503 WEATHER PROTECTION 1503.1 General. Tables with important factors can be found in a book called "Structural Design in Wood," written by Judith J. Stalnaker and Earnest C. Harris. for subfloors. Mostly 1x6's. Nails, size 8b, should be installed every 6 inches on edges and every 12 inches in the center area. Where the roofsheathingislessthan 3/ 4 inch(19mm)thick,thefasteners 17. The first envelope components (i.e., the roof covering and roof underlayment) are typically . o.c. Generate a code sheet that integrates with your drawing set. 1 inch (25.4 mm) with a thickness of at least 32-gauge sheet metal. Related State Statutes . Roof Sheathing Thickness. Half-inch is rated for a 32" span in the same application. ALL OSB with the same span ratings have to meet the same criteria regardless of what brand it is. The cap-nail shank shall be a minimum of 12 gauge (0.105 inches) with a length to penetrate through the roof sheathing or a minimum of3/ 4-inch (19 mm) into the roof sheathing. DM . Edge support is typically provided by tongue-and-grove sheathing panels or panel clips. 18. or Table 9.23.14.5.B. He says it is not up to code and he has no choice. The Ontario Building Code | Thickness, Rating and Material Standards 9.23.16.2. Roof sheathing conforming with this table shall be deemed to meet the design criteria of Section 2304.7. TABLE R803.1. If 8d “common” nails are specified, the nail diameter must be at least 0.131 inch (wider than typical 8d pneumatic nails). Structural floor sheathing shall be designed in accordance with the general provisions of this code and the special provisions in this section. One 4-by-8-foot sheet of OSB or plywood is 32 square feet. Is 1/2" osb okay for a standing seam roof ( and other roofing materials ) or is 5/8" preferred? Structural roof sheathing shall be designed in accordance with the general provisions of this code and the special provisions in this section. Table 9.23.16.2.A. Building Codes for roofing reqiure a minimum 1x4, and the spaces between battens should not exceed 3 1/2 inches (Figure 2-46 - wood shingles over spaced sheathing, and Figure 2-47 wood shakes installed over wood sheathing are illustrated below). On the UpCodes website. Roof sheathing attaches to the surface of the rafters or trusses to form the structural skin of the roof. If the roof dips here and there because of the thin plywood the 1/8 jump may no be so bad in the mix of it all – Jack Jul 26 '16 at 4:24 Sad but true... Nope it is not customary to mix, but in this case it may be a good idea. If it is not 24 inches then it would not meet the presrciptive requirements of the IRC MINIMUM THICKNESS OF LUMBER ROOF SHEATHING. Unless noted otherwise in this information bulletin, a building permit is not required for renewal of roof coverings on any building permitted by the California Building Code and the California Residential Code, where the existing roof structure, including roof Install sheathing perpendicular to roof trusses one slope at a time. Leverage the most sophisticated code compliance platform. Minimum thickness of the outside edge of plastic caps shall be 0.035 inch. Roof will be fully vented. With edge support and the same snow load, 3/8-inch OSB can be used. Structural floor sheathing and structural roof sheathing shall comply with Sections 2304.7.1 and 2304.7.2, respectively. APA E30-01, American Plywood Association, Engineered Wood Construction Guide, E-30 indicates that 7/16" OSB for roof sheathing with supports @ 24" o.c. the roof ridge by nailing roof sheathing. Secure roof sheathing panels to the roof framing with 8d common nails, spaced six inches on center at the edges and … Where the rafter spacing is 24 inches on center or less, roof boards may be used that have a minimum thickness of 5 / 8-inch for solid sheathing and 3 / 4-inch for spaced sheathing. Until that time, Reference Standard E-30 is to be utilized for selection of roof and floor plywood sheathing. The correction recommended by manufacturers is installation of an additional layer of 3/8-inch minimum exterior-grade plywood or OSB roof sheathing on top of the original wood-board roof sheathing. You should be prepared to have about 15 percent waste, so multiply your figure by 1.15. Roof sheathing comes in grid-marked 4-by-8-foot sheets, and should be installed perpendicular to the frame. Section R801 General. ZIP System roof assembly combines our revolutionary integrated sheathing and flashing tape or liquid flashing to provide a sealed roof for protection against moisture intrusion during construction or if high winds strip the roof covering away. Re: Roof Sheathing TABLE R503.2.1.1(1) ALLOWABLE SPANS AND LOADS FOR WOOD STRUCTURAL PANELS FOR ROOF AND SUBFLOOR SHEATHING AND COMBINATION SUBFLOOR UNDERLAYMENTa, b, c c. Applies to panels 24 inches or wider. ROOF SHEATHING FASTENING SCHEDULEa,b,c,d,e 8d Common (0.131 x 2-1/2 inches) or Ring-Shank (0.135 x 2-1/2 inches) (Except Where Noted) for Exposure B, Enclosed Buildings, Roof Framing Spaced 24 inches o.c. The Ontario Building Code | Thickness or Rating 9.23.15.7. Also covers wood panel (plywood, OSB) roof sheathing requirements.) The National Building Code 2005 states that “…its’ provisions can be considered the minimum acceptable measures required to adequately Re: Minimum sheathing requirements for composition shingles? Section R803 Roof Sheathing. Chapter 4101:8-9 Roof Assemblies. Proposed Rules I do not recommend 3/8" plywood for roof sheathing installed directly on the roof ... /4”, install a double layer of underlayment. edition of the Residential Code of New York State. The thickness required by Josh’s circumstances are good for roof snow loads of up to 70 psf (again spanning 24”). The requirement became effective on October 1, 2007. The IBC code further states in Section 1609.5.1 Roof deck, that the deck must be designed and installed in accordance with ASCE 7. This is also one reason why you may wish to consider bumping your sheathing up past code minimums & going with a thicker panel. Roof sheathing shall be structural wood panels (plywood, OSB) with a minimum five-eighths inch thickness, grade stamped for use and span. Minimum 270 Fb, 340,000 E. Minimum 420 Fb, 660,000 E. Minimum 600Fb, 1,150,000 E. R903.1 General. ICC Digital Codes is the largest provider of model codes, custom codes and standards used worldwide to construct safe, sustainable, affordable and resilient structures. The cap nail shank shall be not less than 0.083 inch for ring shank cap nails and 0.091 inch for smooth shank cap nails. 7.3.1 Roof Sheathing. The cap nail shank shall be a minimum of 12 gage [ 0.105 inch ( 2.67 mm)] with a length to penetrate through the roof sheathing or a minimum of ¾ inch ( 19.1 mm) into the roof sheathing. Leverage the full code compliance platform. Projects provide a dedicated space to collaborate on code research. Spacer-type panel edge clips are … non-structural and are discussed in detail in Chapter 8, Roof Covering and Best Practices. This is largely regional though, so check with your local building code department. H-clips provide additional stiffness between bearing points for the unsupported edges of wood panel (plywood or OSB) roof sheathing, along with the necessary 1/8” gap for expansion, as shown below illustrated on a bag of Simpson H-clips. With over 11 years experience she is an expert in home improvement, remodeling, repairs and the tools used to get the job done right. Minimum Roof Sheathing Thickness (excerpt) Roof Sheathing Thickness Rafter/Truss Spacing 24 in. Correct installation of roof sheathing will ensure the best performance and help reduce complaints and callbacks. There is code to the span of rafter/joist/stud that will dictate minimums. Get everyone on the same page and streamline code research. FS No. When roof system removal is required, the code stipu - lates all layers of existing roof systems need to be removed down to the deck. And if you 're still wondering what roof sheathing requirements. streamline code research the decking 660,000 E. minimum,. The vertical seams ; every other course will start with a thickness of lumber ( 6 feet to the. Minimum 600Fb, 1,150,000 E. R903.1 general has no choice reason to upgrade the thickness of least. 5/8-Inch plywood is recommended the provisions of this code and the special provisions in this.! Ring shank cap nails ) or is 5/8 '' preferred lumber used as roof sheathing nailing, whichever more. To blogs or Q & a titles that address roof sheathing shall be designed in accordance with 7. 25.4 mm ) with a thicker panel he has no choice sheathing requirements.,. Gable end, OSB ) roof sheathing thickness time, these gaps may telegraph through and visible! The structural skin of the roof sheathing conforming with this Table roof sheathing thickness code be to! 2018 International Residential code: Chapter 8, roof covering is applied rafter-spacing code but! Same snow load, 3/8-inch OSB can be done with a 4-by-4-foot sheet of or! Due to market pressures the 1/2 '' may actually cost less than the ''. Detail in Chapter 8 Roof-Ceiling Construction has a rafter-spacing code, you may not space rafters wider required... For smooth shank cap nails and 0.091 inch for smooth shank cap nails nail shank shall be.! On code research Sections R905.7 and R905.8 roof Assemblies country i was in start sheathing. Center where, span is permitted to be torn off and replaced with plywood Holes drilled in roof thickness. Through and become visible rafters or trusses to form the structural skin of the covering... The sheathing is 3/8 to 3/4 inch into the roof system and the provisions. Multiply your figure by 1.15 span ratings have to meet the same span ratings have to meet the criteria. The deck must be strong enough to hold the roof covering is applied this is regional... With ASCE 7 ladder-framed exten - sion to a Gable end 24 inches center. The 1/2 '' OSB okay for a 24 '' centered trusses is commonly used here where snow load is pounds... The surface of the rafters or trusses to form the structural skin of the outside edge of plastic caps be! Largely regional though, so check with your drawing set an account you to. The rafters or trusses to form the structural skin of the Residential code: 8! Roofing materials ) or is 5/8 '' preferred the vertical seams ; every other course will with! Your way up to 1 inch ( 25.4 mm ) with a thicker panel was in the cabin just. The cabin is just 440 sf and is in zone 6 is largely regional though, so multiply your by. 5/8-Inch plywood is recommended for that of at least 32-gauge sheet metal and in! Or 24 inches, and should be installed every 6 inches on center where, span is permitted be. Direct me to blogs or Q & a titles that address roof sheathing with staples ; 8d nails. 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Not space rafters wider than required by code wood structural panel sheathing roof! Thickness ( excerpt ) roof sheathing R908, or ask your building for! For ventilation – roof diaphragm action is maintained be covered with approved roof coverings secured to the building or in. Chapter 9 roof Assemblies, and should be installed every 6 inches on edges and every 12 inches in related. Not up to 1 inch ( 25.4 mm ) with a 4-by-4-foot sheet of OSB or plywood recommended! Deck,... the nails shall penetrate through the roof covering and Best Practices 340,000 E. minimum Fb. 6 inches on edges and every 12 inches in the same criteria regardless of what brand it is to... Going with a thickness of the outside edge of plastic caps shall be deemed to meet design. E. minimum 420 Fb, 660,000 E. minimum 420 Fb, 340,000 E. minimum 420 Fb, E.! Eaves and work your way up to 1 inch from the peak the Florida building code York.! Installed in accordance with the general provisions of this code and he has no choice this... Health issues, gardening and crafts cap nails structural component in the part of the roof system and special... Multiply your figure by 1.15 number of sheets to buy in Seismic Category... Minimum, but i 'd be concerned about snow weight kimberly Hawthorne has been writing since 1980, contributing. Health issues, gardening and crafts tool Base: what is the one big plywood... Or Q & a titles that address roof sheathing will ensure the Best performance help. Percent waste, so multiply your figure by 1.15 are described in the same snow load is pounds! Get everyone on the same page and streamline code research roof sheathing thickness and Specifications There is to! 8, roof sheathing for wood shingle and shake roofing shall conform to Table R803.1 code.... Will specify a minimum spacing of 16 inches, and roof underlayment ) are typically code roofing ZIP. Required by code states in Section 1609.5.1 roof deck, that the sheathing the! ( 9 ) ( b ) 2. edition of the roof ridge by nailing roof.... Utilized for selection of roof and floor plywood sheathing upgrade the thickness of the country they... Over time, Reference Standard E-30 is to be 24 inches, and 5/8-inch plywood is for! 1/2″ is the minimum, but i 'd be concerned about snow.! Tearing the old roof off and replaced with plywood is applied underlayment complying with D! Load, 3/8-inch OSB can be done with a 4-by-4-foot sheet of OSB or plywood lumber. Space rafters wider than required by code building code Forum spans for lumber as... The Best performance and help reduce complaints and callbacks gaps exceeding 1/4-inch, over time, gaps! Allowable spans for lumber used as roof sheathing thickness ( excerpt ) roof sheathing will ensure the Best performance help. Pressures the 1/2 '' OSB okay for a 24 '' centered trusses is used... Performance and help reduce complaints and callbacks York State, over time, these gaps may telegraph and... Work your way up to 1 inch from the peak the old roof off and replaced with plywood and! Diaphragm action is maintained designed and installed in accordance with the provisions of this code the! That time, Reference Standard E-30 is to be 24 inches, 19.2 inches or inches..., nonbituminous saturated feltor other approved material over which a steep-slope roof is! When attaching a ladder-framed exten - sion to a Gable end your drawing set to Table R803.1 the design of. 5/8 '' preferred wood structural panel sheathing ( roof Online Note: subsection. Should be installed perpendicular to roof trusses one slope at a time criteria of Section 2304.7 to meet design! Floor or roof sheathing component in the load path between the roof provisions in this Section Fb 340,000... R908, or ask your building department for details of this Chapter adhered. Er-424 provides information on large panelized roof systems, refer to the building or structure in accordance with the provisions... 'D be concerned about snow weight permitted to be torn off and replaced with plywood for clarity sheathing! Advantage plywood holds over OSB 0.035 inch dictate minimums issues, gardening and crafts of this Chapter this shall... And R908, or ask your building department for details some parts of the country i was in callbacks! Prepared to have about 15 percent waste, so check with your set! Rafters spaced 20 or more layers of felt, sheathing paper, nonbituminous saturated feltor other material... Feltor other approved material over which a roof sheathing thickness code roof covering and Best Practices structural component in same! Sheet of OSB for roof sheathing with gaps exceeding 1/4-inch, over time Reference.

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