CDX works fine in 12. Its a pretty small difference but if its trusses and they were designed for 12.
Cleaning Up Roof Beams On Router Table Total Thickness Of Beam With Two Glued Is 38mm
Plywood thicknesses for roofs start at 38 in areas with light load requirements on rafters at 16 centers.
How thick should plywood be on a roof. 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. Thats considered to be the minimum. Mixing thicknesses is not preferred either but if you use the proper underlayments and decent shingles particularly archatectural you arent likely to notice.
For heavy load rated areas 34-inch-thick plywood is recommended regardless of rafter spacing. Dec 06 2018 The Minimum Plywood for Roofing Plywood Is Layers of Wood. This kind of plywood can be used on roofs with minimal load.
Oct 03 2013 OSB panels can be manufactured in lengths up to 16 feet or sometimes even higher while plywood is generally limited to 8 to 10 feet. Thick is still acceptable the variable in this this case is. Sheets of 716-inch thick with no edge support can be used in an area where the snow load is 30 pounds per square foot.
The roof covering will be asphalt shingles. Typical types of wood used for roof sheathing are oriented strand board known as OSB and plywood the most popular being OSB. ZIP sheathing on roofs and metal roofing installers have never questioned it.
OSB boasts a more consistent density. An exception to this standard however may occur if you intend to install slate. Jul 11 2004 As per code in my area Ottawa Canada I plan on using 38 plywood for sheathing.
The thickness of plywood used for roof decking depends on the roof slope the spacing of. Jul 18 2007 If it is is 16. You could just try to get -inch thick plywood as it will be a little thicker and more durable.
Illustrious Member Registered 11113 Posts 5552 5 10. One thing to consider is that the new plywood probably wants to be the same thickness as what would be used if it was used by itself on the rafters ie. Check roof loading 34.
Apr 05 2018 Ive always used either 12. With edge support and the same snow load 38-inch OSB can be used. Malcolm I almost always use 58.
I just read somewhere actually in Taunton Press Roofing with Asphalt Shingles book that one should consider using sheathing thicker than code to avoid sagging between rafters. If the old plywood was clean and not infested with dry rot or mold it should be OK to cover it with the new plywood. Mar 02 2021 These are all different but 14 inch would be in my opinion too thin for most anything the only thing I would use that for is if I were building a lightweight moveable design or maybe use it for building nest boxes or something.
If you think of the way that plywood is manufactured every 18 thickness is a different layer that is rotated 90 degrees which is what gives plywood its bi-directional strength and dimensional stability. However you may need to consider bolstering the plywood thickness for a roof that has a higher load. If your tusses are 24.
I never use anything less than 58 plywood for exterior roof sheathing. Thickness and possibly in 12. Center to center 12.
Is heavier than 12. When you are building a roof deck out of plywood you need to make sure that it is thick enough to support the weight of people standing on it. It is certainly not preferred by professionals interested in quality.
Plywood is made with three or more layers of thin wood glued together with the grain. This minimum will only work if the rafters are set 16 inches apart at most and if the roof doesnt have too much load. If the old plywood.
Plywood on a roof. On the overhangs so the roofing nails dont show underneath. Foot and with a maximum of spacing of 16 inches between rafters.
In this case plywood should be a minimum of 38 inch thick. Thick plywood is totally acceptable. Ive never used commodity OSB on a roof but its probably fine in 58.
With 58 plywood you. A lot of guys use 58. 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.
Sheet with varying thickness. Steeper rather than flatter roofs will have lesser load per sq. Thicknesses of 12 to 58 inch are common with rafters spaced at 24 centers.
Many Factors Affect Thickness. Sep 23 2009 12. Plywood typically comes in 48 ft.
The minimum thickness of plywood used for roofing is 38 th of an inch. Topic starter 20 or more inches apart 12- or 58-inch plywood is recommended. Is standard around here.
Occasionally I have seen 38. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 38 inch thick. While a sheet of plywood might be 5 to 7 plies thick a sheet of OSB is made from as many as 50 strand layers packed and compressed into the same thickness.
Half inch on a roof is usually OK and very common at least around here. How thick should roofing plywood be. The minimum thickness that you should use for this project is 1532 inches.
Standard roof sheathing which consists of 4-by-8 sheets of plywood or oriented strand board or OSB is 12-inch thick and attaches directly to the roof rafters or the roof trusses.
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