The more common roof thickness is 34-inch decking. For heavy load rated areas 34-inch-thick plywood is recommended regardless of rafter spacing.
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Half inch on a roof is usually OK and very common at least around here.
What size plywood should i use on my roof. Wooden eaveshave been used on roofs for centuries. The minimum thickness of plywood used for roofing is 38 th of an inch. All values are for 16 gauge galvanized wire staples having a minimum crown width of 38.
One 4-by-8-foot sheet of OSB or plywood is 32 square feet. The first side I set the nails on a slight angle so it didnt penetrate the back side of the 2X truss material. Occasionally I have seen 38.
Sheet with varying thickness. Use it indoors or outdoors but avoid using for framing permanent structures such as a shed or a home. Follow the tips below when deciding what type of wood is right for your home.
A roof that lays practically flat will have a much heavier load than a steeper roof that allows rain snow and ice to roll right off. Take the roofs total square footage and divide by 32. Foot and with a maximum of spacing of 16 inches between rafters.
Recommended Minimum Stapling Schedule for Plywood. Plywood on a roof. Steeper rather than flatter roofs will have lesser load per sq.
So dividing the area of the roof by 32 will give you the number of sheets needed. The original design is for locally fabricated trusses using 12 plywood gussets with 8d nails set 2. Throughout the years a variety of different woods have been used for peoples homes.
The thickness required by Joshs circumstances are good for. Jul 08 2016 While plywood can be about 5 to 7 plies thick OSB can be composed of as many as 50 strand layers compressed together. Multi-ply is a catchall term for plywood with seven or more plies.
Thickness often depends on how spaced apart the rafters are. 5-ply is a versatile type of plywood that is about 4-millimeters thick. However you may need to consider bolstering the plywood thickness for a roof that has a higher load.
Dec 16 2019 Truss factories use spiked metal gusset plates with their size shape and location specified as part of the engineering. For example if your roof is 1500 ft 2 then it will take 47 sheets of plywood to sheath it. Dec 06 2018 For rafters spaced 20 or more inches apart 12- or 58-inch plywood is recommended.
A 48 sheet of plywood is 32 ft 2. Oct 25 2017 For the curious 716 OSB has a span rating of 2416 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. Plywood thicknesses for roofs start at 38 in areas with light load requirements on rafters at 16 centers.
If your roof carries a heavier load like if theres less pitch andor it snows in your area a roofer may recommend the use of the. It is certainly not preferred by professionals interested in quality. Mixing thicknesses is not preferred either but if you use the proper underlayments and decent shingles particularly archatectural you arent likely to notice.
This plywood is strong and durable enough for use in roofing framing and other exterior structural projects. This will give you the total number of sheets to buy. The plates are sunk into the wood at connection points with heavy rollers or a hydraulic press to create an extremely stable connection.
This kind of plywood can be used on roofs with minimal load. 32 46875 sheets. You should be prepared to have about 15 percent waste so multiply your figure by 115.
Thicknesses of 12 to 58 inch are common with rafters spaced at 24 centers. Whereas OSB is usually about 716 inches thick. The plans called for construction adhesive on the gussettruss interface.
It will support roof. The most common rafter spacing is 24 inches and 58-inch plywood is recommended for that. In this case plywood should be a minimum of 38 inch thick.
A half inch CDX plywood is often used with rafter with 24-inch spacing. Dec 06 2018 OSB and plywood come in thicknesses ranging from 516 to 34 inch and the thickness needed for a particular roof depends on several factors including rafter spacing expected load and roof design. But most of the time plywood is about -⅝ inch thick when sheathed on a roof.
Plywood typically comes in 48 ft. When installing asphalt shingles on felt only to any grade decking you should use 1-inch long roofing nails.
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