Flat Roof Plywood Thickness

The typical thickness range for sheathing is 3 8 to 3 4 inch.

Flat roof plywood thickness.

Required dimensions of plywood for roofing. Sheet with varying thickness. 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 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.

Zip system panels install fast and stay flat for a roof that looks as good as it performs. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. This kind of plywood can be used on roofs with minimal load.

Plywood typically comes in 4 8 ft. That s considered to be the minimum. 8d ring shank nails should be used instead. Steeper rather than flatter roofs will have lesser load per sq.

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. A minimum thickness of 18mm these will be able to span up to 600mm. 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.

Sheathing should be a minimum of 19 32 inch thick. 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. 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. Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood.

Foot and with a maximum of spacing of. That s considered to be the minimum. Plywood boards used for the deck should be. Most roofs will be sheathed in plywood at least 3 8 inch thick.

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.