Flat Roof Plywood Thickness

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.

Flat roof plywood thickness.

Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Sheathing should be a minimum of 19 32 inch thick. 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.

Required dimensions of plywood for roofing. 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. Plywood for a roof deck should be of marine grade and suitable for external use to bs en 636 or a bond class 2 or better complying with bs en 314 check. A minimum thickness of 18mm these will be able to span up to 600mm.

Foot and with a maximum of spacing of. The most common thickness of plywood is 1 2 inch but plywood thickness can range from 1 8 inch to 3 4 inches. The minimum thickness of plywood used for roofing is 3 8 th of an inch. Plywood boards used for the deck should be.

This kind of plywood can be used on roofs with minimal load. Most roofs will be sheathed in plywood at least 3 8 inch thick. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. That s considered to be the minimum.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood. The typical thickness range for sheathing is 3 8 to 3 4 inch. 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.

Plywood typically comes in 4 8 ft. 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. 8d ring shank nails should be used instead. Never attach roof sheathing with staples.

Steeper rather than flatter roofs will have lesser load per sq.