Standard Roof Plywood Thickness

Its size tolerances especially for thickness are smaller that those for the utility grade plywood used in the building trades for roof and wall sheathing subfloors and general use purposes.

Standard roof plywood thickness.

Tolerance for utility grade thickness is 1 32 inch and for cabinet grade plywood 1 64 inch. Most of plywood sheets available in different thicknesses. Even though with all variation often 3 4 19 mm nominal 23 32 thickness tongue and groove. Plywood thickness for the roof.

The minimum thickness of plywood used for roofing is 3 8 th of an inch. If you are not experienced you may measure a wrong thickness. The typical thickness range for sheathing is 3 8 to 3 4 inch. You can use a caliper to measure the thickness as showing in above photo.

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 here in snow country 1 2 osb is standard with 7 16 being common for walls. Both cdx plywood and osb tend to come in standard sheets of four foot by eight foot 4 8. The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an. 8d ring shank nails should be used instead.

How many square feet are there in a 4 8 sheet of plywood. Foot and with a maximum of spacing of 16 inches between rafters. You just need to multiply the length by the width. Because of its construction some manufacturers actually make larger sheets of osb.

In the photo the caliper reads 17 75mm. Steeper rather than flatter roofs will have lesser load per sq. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Osb and plywood come in thicknesses ranging from 5 16 to 3 4 inch and the thickness needed for a particular roof depends on several factors including rafter spacing expected load and roof design.

This kind of plywood can be used on roofs with minimal load. Sheathing should be a minimum of 19 32 inch thick. Thickness tolerance is allowed in all plywood standards like iso us and european plywood standard jpic china plywood standard measuring the plywood thickness. Softwood plywood typically used for rough framing comes in 4 x 8 feet 1220 x 2438 millimeters sheets.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. However you might find that osb can better suit your needs than plywood for the roof. Never attach roof sheathing with staples. Chart represents most common plywood sheet sizes in inches imperial system and millimeters metric dimensions.