Flat Roof Plywood Thickness

Roof decking is the material that lies on top of the main roofing structure and the underlayment and roof covering is applied on top.

Flat roof plywood thickness.

Find the area of a roof. Plywood typically comes in 4 8 ft. 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. 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.

Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood. If you have any. 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. Never attach roof sheathing with staples.

Plywood boards used for the deck should be. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. This kind of plywood can be used on roofs with minimal load. To find the amount of plywood needed to cover a roof start by finding the area of the roof.

A minimum thickness of 18mm these will be able to span up to 600mm. The minimum thickness of plywood used for roofing is 3 8 th of an inch. 8d ring shank nails should be used instead. That s considered to be the minimum.

That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. In roofing plywood can be used as roof decking. Whether you re looking for plywood pitched roofing materials flat roofing materials or accessories we ve got everything you ll need. 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.

Once the area is known divide by the area of a 4 8 sheet to find how much sheathing is needed. Multiply the length of the roof in feet by the width of the roof in feet to find the area of the roof in square feet. That s considered to be the minimum. Required dimensions of plywood for roofing.

Sheet with varying thickness. Sheathing should be a minimum of 19 32 inch thick. Foot and with a maximum of spacing of. Steeper rather than flatter roofs will have lesser load per sq.

Loads will vary with the pitch of the roof.