How Thick Roofing Plywood

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.

How thick roofing plywood. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Roofs are framed with rafters or trusses which are rafters joined by internal braces so they install as a single component. Keep in mind that the load of the roof still plays a role in the plywood thickness. When this is the case experts recommend a 5 8 inch thick sheet.

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. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. That s considered to be the minimum.

Rafters run from the peak of the roof. 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. Severe weather 1 2 in common douglas fir plywood sheathing application as 4 x 8.