You should be prepared to have about 15 percent waste, so multiply your figure by 1.15. Minimum Roof Sheathing Thickness (excerpt) Roof Sheathing Thickness Rafter/Truss Spacing 24 in. Code Calculators automatically generates a detailed list of requirements. ICC Digital Codes is the largest provider of model codes, custom codes and standards used worldwide to construct safe, sustainable, affordable and resilient structures. (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.) Span is permitted to be 24 inches on center where, Span is permitted to be 24 inches on center for floors where 1. Never attach roof sheathing with staples; 8d ring-shank nails should be used instead. R803.2 Wood Structural Panel Sheathing (Roof Online Note: This subsection covers plywood and OSB sheathing. The IBC code further states in Section 1609.5.1 Roof deck, ... the nails shall penetrate through the sheathing. [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. 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 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. (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. Chapter 4101:8-9 Roof Assemblies. Is 1/2" osb okay for a standing seam roof ( and other roofing materials ) or is 5/8" preferred? Hunker may earn compensation through affiliate links in this story. ER-424 provides information on the description, uses and code compliance of ZIP System Roof Sheathing with the Florida Building Code. Sad but true... Nope it is not customary to mix, but in this case it may be a good idea. Roof will be fully vented. Take the roof's total square footage and divide by 32. 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 For SI: 1 inch = 25.4 mm. Minimum Roof Sheathing Thickness (excerpt) Roof Sheathing Thickness Rafter/Truss Spacing 24 in. 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. Exception: As an alternative, adhered underlayment complying with ASTM D 1970 shall be permitted. 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. Approved Admin Rules . or Table 9.23.16.2.B. Secure roof sheathing panels to the roof framing with 8d common nails, spaced six inches on center at the edges and … 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. MINIMUM THICKNESS OF LUMBER ROOF SHEATHING. Structural roof sheathing shall be designed in accordance with the general provisions of this code and the special provisions in this section. SECTION 1503 WEATHER PROTECTION 1503.1 General. What H-Clips Do. Sheathing should be a minimum of 19/32-inch thick. Rapidly and efficiently calculate project parameters. Where the roofsheathingislessthan 3/ 4 inch(19mm)thick,thefasteners 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. For SI: 1 inch = 25.4 mm. 7.3.1 Roof Sheathing. 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. Plywood's Advantage over OSB? Due to market pressures the 1/2" may actually cost less than the 3/8" and will be stronger. Please see IRC Sec-tions R905 and R908, or ask your building department for details. Jump to Latest Follow 1 - 9 of 9 Posts ... hmmm, dunno code, but i'd be concerned about snow weight. 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. It is important to check the local building codes for your area as well. However, there IS a common reason to upgrade the thickness of the roof sheathing as explained above. Ladder framing at gable ends. If your local building authority has a rafter-spacing code, you may not space rafters wider than required by code. code or matching the existing roof sheathing nailing, whichever is more restrictive. Correct installation of roof sheathing will ensure the best performance and help reduce complaints and callbacks. Kimberly Hawthorne has been writing since 1980, currently contributing to various websites. Related State Statutes . Rafters must be strong enough to hold the roof sheathing and the shingles. DM . FS No. See Table R503.2.1.1 for minimum allowable panel thickness by span and load.) This can be done with a straight piece of lumber (6 feet to … Step 4: Cover sheathing with shingle underlayment felt to minimize roof sheathing exposure to weather, unless otherwise recommended by sheathing manufacturer. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of Section 2304.7. Chapter 4101:8-9 Roof Assemblies. MINIMUM THICKNESS OF LUMBER ROOF SHEATHING. Codes & Rules . o.c. 4101:8-9-01 Roof assemblies. B. Holes drilled in roof sheathing for ventilation – roof diaphragm action is maintained. 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. MINIMUM THICKNESS OF LUMBER ROOF SHEATHING 17. o.c. One 4-by-8-foot sheet of OSB or plywood is 32 square feet. For rafters spaced 20 or more inches apart, 1/2- or 5/8-inch plywood is recommended. 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. Section R801 General. The Ontario Building Code | Thickness or Rating 9.23.15.7. or Table 9.23.14.5.B. Typical rafter-spacing codes will specify a minimum spacing of 16 inches, 19.2 inches or 24 inches. When roof system removal is required, the code stipu - lates all layers of existing roof systems need to be removed down to the deck. Also covers wood panel (plywood, OSB) roof sheathing requirements.) At my expense of course. for subfloors. Recently had hail damage to my asphalt shingles. See Table R503.2.1.1 for minimum allowable panel thickness by span and load.) Sheathing should be a minimum of 19/32-inch thick. ing roof coverings; and when the existing roof system is wet or deteriorated to the point it will not be a suitable substrate. 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 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. 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.