Flat Roof Plywood 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.

Flat roof plywood thickness.

A minimum thickness of 18mm these will be able to span up to 600mm. Steeper rather than flatter roofs will have lesser load per sq. 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. The typical thickness range for sheathing is 3 8 to 3 4 inch.

This kind of plywood can be used on roofs with minimal load. Zip system sheathing and tape provides a water resistant durable underlayment for many finished roof coverings including metal tile and asphalt shingles fiberglass shingles and cedar shingles. 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. That s considered to be the minimum.

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. Most roofs will be sheathed in plywood at least 3 8 inch thick. Never attach roof sheathing with staples. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.

8d ring shank nails should be used instead. Zip system panels install fast and stay flat for a roof that looks as good as it performs. Loads will vary with the pitch of the roof. The minimum thickness of plywood used for roofing is 3 8 th of an inch.

Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood. Sheet with varying thickness. Required dimensions of plywood for roofing. Plywood typically comes in 4 8 ft.

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. That s considered to be the minimum. Foot and with a maximum of spacing of.

Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick.