How Thick Roofing Plywood

Rafters run from the peak of the roof.

How thick roofing plywood.

The most common plywood uses include support for floors walls roofs and garages in residential construction. Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood. When this is the case experts recommend a 5 8 inch thick sheet. 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.

Roofs are framed with rafters or trusses which are rafters joined by internal braces so they install as a single component. The minimum plywood for roofing. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. Severe weather 1 2 in common douglas fir plywood sheathing application as 4 x 8.

This minimum will only work if the rafters are set 16 inches apart at most and if the roof doesn t have too much load. When used for roofing plywood panels are covered and protected by a variety of building materials that keep the elements at bay including roof felt underlayment flashing and shingles. That s considered to be the minimum.