What Type Of Plywood To Use For Attic Floor

Some screwed others not.

What type of plywood to use for attic floor.

Don t use 7 16 osb as it is intended for external sheathing and isn t strong enough to be used as a floor. If you re familiar with basic carpentry and framing techniques installing decking for attic storage. The cost savings is insignificant compared to the extra support offered by the thicker material. As an alternative 3 4 osb can be used.

In that case you will need to use 3 4 thick plywood. But there s no real reason to use plywood thinner than 3 4 inch. I assume 3 4 inch but there are many types brands to choose from. Plywood comes in large sheets.

The decision regarding the thickness of plywood to use for the subfloor in the attic has a lot to do with how you intend to use the attic and it also depends on the spacing of the ceiling joists. Cut the plywood into manageable strips about 10 inches wide to make the job easier. For joists spaced 24 inches oc use thicker inch plywood to prevent sagging between them. The national wood flooring association recommends a minimum plywood panel thickness of 7 8 inch for joist spans of 19 2 to 24 inches and a minimum plywood panel thickness of 5 8 inch for joist spans of 16 inches or less.

The building code allows for the use of osb in place of plywood for subflooring. My attic is located above my garage and currently the former owner had random pieces of plywood placed up there.