Flat Roof Plywood Thickness

Required dimensions of plywood for roofing.

Flat roof plywood thickness.

Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood. A roof that lays practically flat will have a much heavier load than a steeper roof that allows rain snow and ice to roll right off. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. I thought perhaps he made a mistake but no this is what he is proposing.

Roof decking is the material that lies on top of the main roofing structure and the underlayment and roof covering is applied on top. 8d ring shank nails should be used instead. Sheathing should be a minimum of 19 32 inch thick. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.

The most common thickness of plywood is 1 2 inch but plywood thickness can range from 1 8 inch to 3 4 inches. Whether you re looking for plywood pitched roofing materials flat roofing materials or accessories we ve got everything you ll need. The existing plywood on my roof is only 3 8. In roofing plywood can be used as roof decking.

Never attach roof sheathing with staples. Foot and with a maximum of spacing of. The minimum thickness of plywood used for roofing is 3 8 th of an inch. Most roofs will be sheathed in plywood at least 3 8 inch thick.

Loads will vary with the pitch of the roof. He said it s only a difference of 1 8 thickness. 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. Sheet with varying thickness.

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. Steeper rather than flatter roofs will have lesser load per sq. Plywood typically comes in 4 8 ft.

If you have any. A local roofer submitted a proposal to me for a roof placement that included replacing rotten plywood with 1 2 cdx. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. This kind of plywood can be used on roofs with minimal load.