Standard Roof Plywood Thickness

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.

Standard roof plywood thickness.

How many square feet are there in a 4 8 sheet of plywood. 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. 30 years on it s working out fine. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick.

Because of its construction some manufacturers actually make larger sheets of osb. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an. Softwood plywood typically used for rough framing comes in 4 x 8 feet 1220 x 2438 millimeters sheets.

Thickness tolerance is allowed in all plywood standards like iso us and european plywood standard jpic china plywood standard measuring the plywood thickness. Foot and with a maximum of spacing of 16 inches between rafters. However you might find that osb can better suit your needs than plywood for the roof. The typical thickness range for sheathing is 3 8 to 3 4 inch.

8d ring shank nails should be used instead. Most of plywood sheets available in different thicknesses. Steeper rather than flatter roofs will have lesser load per sq. In the photo the caliper reads 17 75mm.

This kind of plywood can be used on roofs with minimal load. A standard sheet of plywood is 4 8. Chart represents most common plywood sheet sizes in inches imperial system and millimeters metric dimensions. Both cdx plywood and osb tend to come in standard sheets of four foot by eight foot 4 8.

The thickness of plywood used for roof decking depends on the roof slope the spacing of rafters and the weight of other material to be put over the decking as well as the design load the. Never attach roof sheathing with staples. You just need to multiply the length by the width. Even though with all variation often 3 4 19 mm nominal 23 32 thickness tongue and groove.

Plywood thickness for the roof. Tolerance for utility grade thickness is 1 32 inch and for cabinet grade plywood 1 64 inch. If you are not experienced you may measure a wrong thickness. Sheathing should be a minimum of 19 32 inch thick.