For rafters spaced 20 or more inches apart, 1/2- or 5/8-inch plywood is recommended. Roof will be fully vented. Approved Admin Rules . 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 He says it is not up to code and he has no choice. longevity of your new roof: Roof Sheathing Preparation (for com-plete tear offs): • The roof sheathing must provide a ... etrate through the total thickness of the roofing and a minimum of 3/4” into ... additional code requirements may apply. However, there IS a common reason to upgrade the thickness of the roof sheathing as explained above. 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. non-structural and are discussed in detail in Chapter 8, Roof Covering and Best Practices. The most common rafter spacing is 24 inches, and 5/8-inch plywood is recommended for that. Recently had hail damage to my asphalt shingles. 2. Floor and roof sheathing conforming with this table shall be deemed to meet the design criteria of Section 2304.7. One or more layers of felt, sheathing paper, nonbituminous saturated feltor other approved material over which a steep-slope roof covering is applied. Never attach roof sheathing with staples; 8d ring-shank nails should be used instead. MINIMUM THICKNESS OF LUMBER ROOF SHEATHING Where the roofsheathingislessthan 3/ 4 inch(19mm)thick,thefasteners If 8d “common” nails are specified, the nail diameter must be at least 0.131 inch (wider than typical 8d pneumatic nails). Generate a code sheet that integrates with your drawing set. MINIMUM THICKNESS OF LUMBER ROOF SHEATHING. or Table 9.23.14.5.B. For information on large panelized roof systems, refer to the Commercial Construction application section. It spans the rafters to support the roofing and, in the case of panel sheathing such as plywood or OSB, it acts as a diaphragm with the walls to resist horizontal loads. Where the roofsheathingislessthan 3/ 4 inch(19mm)thick,thefasteners Any feedback would be appreciated. The first envelope components (i.e., the roof covering and roof underlayment) are typically . Code Recognition for Florida Building Code Roofing Underlayment ZIP System Roof Sheathing | ER-424. o.c. Roof decks shall be covered with approved roof coverings secured to the building or structure in accor-dance with the provisions of this chapter. 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. By creating an account you agree to the Hunker. If asphalt shingles are installed over sheathing with gaps exceeding 1/4-inch, over time, these gaps may telegraph through and become visible. Recent Rulings . Spaced lumber sheathing is not allowed in Seismic Design Category D 2. Spacer-type panel edge clips are … FS No. R803.2 Wood Structural Panel Sheathing (Roof Online Note: This subsection covers plywood and OSB sheathing. Allowable spans for lumber used as roof sheathing shall conform to Table R803.1. The National Building Code of Canada 2005, has now clearly – without doubt – defined that a deck area IS considered a ROOF, and that the only acceptable Standard for PVC membranes is CGSB-37.54-95. Exception: As an alternative, adhered underlayment complying with ASTM D … A strong, resilient roof is a home’s first line of defense when the roof deck is exposed to weather. 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. SECTION 1503 WEATHER PROTECTION 1503.1 General. For the curious – 7/16” OSB has a span rating of 24/16 and with supports every 24 inches is good for a roof live load of 40 psf (pounds per square foot) with a 10 psf dead load. The typical thickness range for sheathing is 3/8 to 3/4 inch. 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. I do not recommend 3/8" plywood for roof sheathing installed directly on the roof ... /4”, install a double layer of underlayment. be designed and installed in accordance with this code and the ... THICKNESS (INCHES) GAGE WEIGHT (lbs per sq ft) Copper 0.024 1 (16 oz) Aluminum 0.024 Stainless steel 28 ... 4 inch (19 mm) into the roof sheathing. 2. One 4-by-8-foot sheet of OSB or plywood is 32 square feet. Minimum Roof Sheathing Thickness (excerpt) Roof Sheathing Thickness Rafter/Truss Spacing 24 in. 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. ER-424 provides information on the description, uses and code compliance of ZIP System Roof Sheathing with the Florida Building Code. Structural roof sheathing shall be designed in accordance with the general provisions of this code and the special provisions in this section. Edge support is typically provided by tongue-and-grove sheathing panels or panel clips. 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. TABLE R803.1. Section R802 Wood Roof Framing. 7.3.1 Roof Sheathing. Roof sheathing shall be structural wood panels (plywood, OSB) with a minimum five-eighths inch thickness, grade stamped for use and span. Also covers wood panel (plywood, OSB) roof sheathing requirements.) Plywood's Advantage over OSB? Projects provide a dedicated space to collaborate on code research. 18 – Roof Sheathing Installation Home Builder’s Guide to Coastal Construction 08/05 Page 2 of 3 recommended that deformed shank nails be used throughout the entire roof. Get everyone on the same page and streamline code research. code or matching the existing roof sheathing nailing, whichever is more restrictive. 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. Unpack the code through illustrations and descriptions. Roof sheathing attaches to the surface of the rafters or trusses to form the structural skin of the roof. 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). ICC Digital Codes is the largest provider of model codes, custom codes and standards used worldwide to construct safe, sustainable, affordable and resilient structures. Minimum 270 Fb, 340,000 E. Minimum 420 Fb, 660,000 E. Minimum 600Fb, 1,150,000 E. R903.1 General. Is 1/2" osb okay for a standing seam roof ( and other roofing materials ) or is 5/8" preferred? The IBC code further states in Section 1609.5.1 Roof deck, ... the nails shall penetrate through the sheathing. 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. The roofer has been tearing the old roof off and has found that the sheathing is dimensional lumber. Jump to Latest Follow 1 - 9 of 9 Posts ... hmmm, dunno code, but i'd be concerned about snow weight. Roof sheathing comes in grid-marked 4-by-8-foot sheets, and should be installed perpendicular to the frame. wall Sheathing Thickness and Specifications o.c. the roof ridge by nailing roof sheathing. Section R801 General. On the UpCodes website. ICC Digital Codes is the largest provider of model codes, custom codes and standards used worldwide to construct safe, sustainable, affordable and resilient structures. Common roof sheathing applications and installation recommendations are described in the related publications listed at right. The most common rafter spacing is 24 inches, and 5/8-inch plywood is recommended for that. DM . See Table R503.2.1.1 for minimum allowable panel thickness by span and load.) Highlight differences between any two building codes. With over 11 years experience she is an expert in home improvement, remodeling, repairs and the tools used to get the job done right. Leverage the most sophisticated code compliance platform. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of Section 2304.7. Rapidly and efficiently calculate project parameters. 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 Several factors must be considered when determining appropriate roof sheathing thickness, such as the span of roof joists and snow load for the area. 4101:8-9-01 Roof assemblies. Panel thickness will also affect permeability - using the 2 perm variable of 7/16ths OSB sheathing, at 3/4" thickness the permeability drops to 2/3rds of a perm. Exception: As an alternative, adhered underlayment complying with ASTM D 1970 shall be permitted. The requirement became effective on October 1, 2007. Also covers wood panel (plywood, OSB) roof sheathing requirements.) Can someone direct me to blogs or Q&A titles that address roof sheathing thickness? Sheathing is installed perpendicular to roof trusses. Ladder Framing at Gable Ends Use extra care when attaching a ladder-framed exten - sion to a gable end. or Table 9.23.16.2.B. Rafters must be strong enough to hold the roof sheathing and the shingles. Code Calculators automatically generates a detailed list of requirements. Structural floor sheathing shall be designed in accordance with the general provisions of this code and the special provisions in this section. Kimberly Hawthorne has been writing since 1980, currently contributing to various websites. The code includes several specific excep - tions to its roof system removal and replace - At my expense of course. 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 For SI: 1 inch = 25.4 mm. TABLE 2304.7(1) ALLOWABLE SPANS FOR LUMBER FLOOR AND ROOF SHEATHINGa, b, TABLE 2304.7(2) SHEATHING LUMBER, MINIMUM GRADE REQUIREMENTS: BOARD GRADE, TABLE 2304.7(3) ALLOWABLE SPANS AND LOADS FOR WOOD STRUCTURAL PANEL SHEATHING AND SINGLE-FLOOR GRADES CONTINUOUS OVER TWO OR MORE SPANS WITH STRENGTH AXIS PERPENDICULAR TO SUPPORTSa, b, TABLE 2304.7(4) ALLOWABLE SPAN FOR WOOD STRUCTURAL PANEL COMBINATION SUBFLOOR-UNDERLAYMENT (SINGLE FLOOR)a, b (Panels Continuous Over Two or More Spans and Strength Axis Perpendicular to Supports), TABLE 2304.7(5) ALLOWABLE LOAD (PSF) FOR WOOD STRUCTURAL PANEL ROOF SHEATHING CONTINUOUS OVER TWO OR MORE SPANS AND STRENGTH AXIS PARALLEL TO SUPPORTS (Plywood Structural Panels Are Five-Ply, Five-Layer Unless Otherwise Noted)a, b. ... 1/2 inch sheathing on 24" centered trusses is commonly used here where snow load is 30 pounds. Roof Sheathing Thickness. And if you're still wondering what roof sheathing is and what materials are typically used, read on and satisfy your curiosity. or Table 9.23.15.7.B. SPS 321.27(9)(b)2. be designed and installed in accordance with this code and the ... THICKNESS (INCHES) GAGE WEIGHT (lbs per sq ft) Copper 0.024 1 (16 oz) Aluminum 0.024 Stainless steel 28 ... 4 inch (19 mm) into the roof sheathing. ¾ plywood is a favorite for some as … code or matching the existing roof sheathing nailing, whichever is more restrictive. With edge support and the same snow load, 3/8-inch OSB can be used. At minimum I prefer a ½ sheet for 16” OC framing, while others I know will go no less than 5/8 or ¾. Many homes have been severely Roof decks shall be covered with approved roof coverings secured to the building or structure in accordance with the provisions of this chapter. 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. Be sure to stagger the vertical seams; every other course will start with a 4-by-4-foot sheet of OSB or plywood. Code calculators automatically generate a detailed list of requirements. Spaced lumber sheathing for wood shingle and shake roofing shall conform to the requirements of Sections R905.7 and R905.8. [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. Codes & Rules . R803.2 Wood Structural Panel Sheathing (Roof Online Note: This subsection covers plywood and OSB sheathing. 4101:8-9-01 Roof assemblies. MINIMUM THICKNESS OF LUMBER ROOF SHEATHING. Please see IRC Sec-tions R905 and R908, or ask your building department for details. Start the sheathing at the eaves and work your way up to 1 inch from the peak. ... the nails shall penetrate through the sheathing. It spans the rafters to support the roofing and, in the case of panel sheathing such as plywood or OSB, it acts as a diaphragm with the walls to resist horizontal loads. 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. edition of the Residential Code of New York State. The first envelope components (i.e., the roof covering and roof underlayment) are typically . Leverage the full code compliance platform. Span is permitted to be 24 inches on center where, Span is permitted to be 24 inches on center for floors where 1. Until that time, Reference Standard E-30 is to be utilized for selection of roof and floor plywood sheathing. Step 4: Cover sheathing with shingle underlayment felt to minimize roof sheathing exposure to weather, unless otherwise recommended by sheathing manufacturer. On the UpCodes website. FS No. Secure roof sheathing panels to the roof framing with 8d common nails, spaced six inches on center at the edges and … Tables with important factors can be found in a book called "Structural Design in Wood," written by Judith J. Stalnaker and Earnest C. Harris. The thickness required by Josh’s circumstances are good for roof snow loads of up to 70 psf (again spanning 24”). 7.3.1 Roof Sheathing. Never attach roof sheathing with staples; 8d ring-shank nails should be used instead. When you replace a roof on a home that was built before the implementation of the statewide Florida Building Code on March 1, 2002, the nailing of the roof sheathing (decking) must be brought up to current standards for hurricane resistance as part of the installation of the new roof. non-structural and are discussed in detail in Chapter 8, Roof Covering and Best Practices. Building Codes: 2018 International Residential Code: Chapter 8 Roof-Ceiling Construction. 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. If your local building authority has a rafter-spacing code, you may not space rafters wider than required by code. ing roof coverings; and when the existing roof system is wet or deteriorated to the point it will not be a suitable substrate. Roof sheathing conforming with this table shall be deemed to meet the design criteria of Section 2304.7. ICC Digital Codes is the largest provider of model codes, custom codes and standards used worldwide to construct safe, sustainable, affordable and resilient structures. Roof sheathing comes in grid-marked 4-by-8-foot sheets, and should be installed perpendicular to the frame. Half-inch is rated for a 32" span in the same application. 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. If you're in search of quotes for a roof sheathing job, ImproveNet can put you in touch with up to four local contractors for free! Tool Base: What is the Minimum Thickness of OSB for Roof Sheathing. Quickly locate sections across your jurisdiction. Welcome to the new and improved Building Code Forum. The cabin is just 440 sf and is in zone 6. Section R803 Roof Sheathing. Don't miss relevant code. Section R802 Wood Roof Framing. 18. 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. For SI: 1 inch = 25.4 mm. It is important to check the local building codes for your area as well. The thickness of the deck shall be 7/16 of an inch to 5/8 of an inch thick and fastened using 8d common nails, 10d box or power-driven nails. What H-Clips Do. Roof decks shall be covered with approved roof coverings secured to the building or structure in accordance with the provisions of this chapter. This will give you the total number of sheets to buy. Roof sheathing is the first structural component in the load path between the roof system and the foundation. 1 inch (25.4 mm) with a thickness of at least 32-gauge sheet metal. Exception: As an alternative, adhered underlayment complying with ASTM D 1970 shall be permitted. 18 – Roof Sheathing Installation Home Builder’s Guide to Coastal Construction 08/05 Page 2 of 3 recommended that deformed shank nails be used throughout the entire roof. When you replace a roof on a home that was built before the implementation of the statewide Florida Building Code on March 1, 2002, the nailing of the roof sheathing (decking) must be brought up to current standards for hurricane resistance as part of the installation of the new roof. Section R801 General. Always Check for a Level Nailing Surface. Proposed Rules 2. Chapter 4101:8-9 Roof Assemblies. Section R803 Roof Sheathing. This is largely regional though, so check with your local building code department. This can be done with a straight piece of lumber (6 feet to … Minimum Roof Sheathing Thickness (excerpt) Roof Sheathing Thickness Rafter/Truss Spacing 24 in. for subfloors. If it is not 24 inches then it would not meet the presrciptive requirements of the IRC (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.) (2) The thickness or rating of roof sheathing on a roof not used as a walking deck shall conform to either Table 9.23.15.7.A. Sheathing should be a minimum of 19/32-inch thick. Roof sheathing is the first structural component in the load path between the roof system and the foundation. 17. Sheathing should be a minimum of 19/32-inch thick. In some parts of the country, they still use 1X boards for the decking. (For clarity, sheathing nails are not shown.) Roof Sheathing Materials Plywood. 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. Floor sheathing conforming to the provisions of, Roof sheathing conforming to the provisions of, Smoke partitions shall extend from the top of the foundation or. edition of the Residential Code of New York State. Sad but true... Nope it is not customary to mix, but in this case it may be a good idea. The Ontario Building Code | Thickness, Rating and Material Standards 9.23.16.2. See Table R503.2.1.1 for minimum allowable panel thickness by span and load.) 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. Take the roof's total square footage and divide by 32. Until that time, Reference Standard E-30 is to be utilized for selection of roof and floor plywood sheathing. Roof sheathing attaches to the surface of the rafters or trusses to form the structural skin of the roof. For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kN/m, 2304.8.1 Wood, Structural Floor Sheathing, 710.4 Fire and Smoke Protection Features, Continuity, Installation details shall conform to Sections. 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. 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. Hunker may earn compensation through affiliate links in this story. For rafters spaced 20 or more inches apart, 1/2- or 5/8-inch plywood is recommended. Adopted Building Codes . This is also one reason why you may wish to consider bumping your sheathing up past code minimums & going with a thicker panel. You should be prepared to have about 15 percent waste, so multiply your figure by 1.15. When roof system removal is required, the code stipu - lates all layers of existing roof systems need to be removed down to the deck. Re: Minimum sheathing requirements for composition shingles? Due to market pressures the 1/2" may actually cost less than the 3/8" and will be stronger. She specializes in human and animal health issues, gardening and crafts. The requirement became effective on October 1, 2007. 1/2″ is the minimum, but 3/4″ was standard in the part of the country I was in. B. Holes drilled in roof sheathing for ventilation – roof diaphragm action is maintained. A reliable and up-to-date source of codes. Chapter 4101:8-9 Roof Assemblies. Minimum 270 Fb, 340,000 E. Minimum 420 Fb, 660,000 E. Minimum 600Fb, 1,150,000 E. R903.1 General. 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. The Ontario Building Code | Thickness or Rating 9.23.15.7. Typical types of wood used for roof sheathing are oriented strand board, known as OSB, and plywood, the most popular being OSB. 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. Correct installation of roof sheathing will ensure the best performance and help reduce complaints and callbacks. If asphalt shingles are installed over sheathing with gaps exceeding 1/4-inch, over time, these gaps may telegraph through and become visible. What H-Clips Do. Contains sections covering roof framing, roof sheathing, and roof ventilation. 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 Typical rafter-spacing codes will specify a minimum spacing of 16 inches, 19.2 inches or 24 inches. 1 inch (25.4 mm) with a thickness of at least 32-gauge sheet metal. Structural roof sheathing shall be designed in accordance with the general provisions of this code and the special provisions in this section. Related State Statutes . There is code to the span of rafter/joist/stud that will dictate minimums. [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. 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). Minimum thickness of the outside edge of plastic caps shall be 0.035 inch. Structural floor sheathing and structural roof sheathing shall comply with Sections 2304.7.1 and 2304.7.2, respectively. He says it all has to be torn off and replaced with plywood. 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. Ladder framing at gable ends. Building Codes: 2018 International Residential Code: Chapter 9 Roof Assemblies. Table 9.23.16.2.A. The typical thickness range for sheathing is 3/8 to 3/4 inch. 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 National Building Code 2005 states that “…its’ provisions can be considered the minimum acceptable measures required to adequately Install sheathing perpendicular to roof trusses one slope at a time. Nails, size 8b, should be installed every 6 inches on edges and every 12 inches in the center area. The thickness of the deck shall be 7/16 of an inch to 5/8 of an inch thick and fastened using 8d common nails, 10d box or power-driven nails. 3/8" APA rated sheathing is typically rated for a 24" span (distance between rafters) in a roof application. 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. Mostly 1x6's. Thickness or Rating (1) The thickness or rating of roof sheathing on a flat roof used as a walking deck shall conform to either Table 9.23.14.5.A. That, in a nutshell, is the one big advantage plywood holds over OSB.
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