Flat Roof Plywood Sheathing

As a quick primer in plywood each side is rated from a to d.

Flat roof plywood sheathing.

Up until 2000 plywood held the majority of the market for wall roof and floor sheathing when it was surpassed by osb which as of 2018 held about 75 of the market share. Odds are that if you pass a housing development of wood framed houses it will have osb oriented strand board as exterior sheathing. If your roof has triangles and other shapes you ll need to use a calculator to find the square footage. 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.

That s considered to be the minimum. Never attach roof sheathing with staples. A strong resilient roof is a home s first line of defense when the roof deck is exposed to weather. It should be placed up on the roof.

Follow these 5 simple construction steps for roof sheathing. One of the nice things about plywood is the variety of options you can buy. A is smooth and knot free while d the lowest quality has missing knots and cracks. Zip system roof assembly combines our revolutionary integrated sheathing and flashing tape or liquid flashing to provide a sealed roof for protection against moisture intrusion during construction or if high winds strip the roof covering away.

Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. 8d ring shank nails should be used instead. Installing sheathing on a flat roof is much easier than working on a peaked roof. That s considered to be the minimum.

Once you have the area you can divide by the area of a sheet of plywood to find the number of sheets needed. A 4 8 sheet of plywood is 32 ft 2. When you count sub floors roofs and wall sheathing osb claims about 70 of the wood sheathing market in north america over plywood. Sheathing should be a minimum of 19 32 inch thick.

So dividing the area of the roof by 32 will give you the number of. The typical thickness range for sheathing is 3 8 to 3 4 inch. One side is usually better quality than the other c in this case. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.

Plywood is typically. Plywood is made with an odd number of layers for optimal strength and performance. Before lumber companies began selling osb the standard choice for sheathing a roof with a 24 inch rafter spacing was 1 2 inch cdx plywood the letters cdx indicate that it is construction grade.