Flat Roof Plywood

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.

Flat roof plywood.

Most roofs are spaced at least 20 inches apart. For this you can either go for a half inch or 5 8 inch. Just enough slope to drain water but also flat enough to be a problem if not constructed properly. This minimum wouldn t work if you have a flat roof.

Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood. Yet for historic modern style buildings like this old house s cambridge tv project flat roofs are at the core of the architecture meant to reflect the broad horizontal lines of the natural landscape. In this case you can t use a 3 8 inch thick sheet. Different material options types of roof plywood.

More product details close. Plywood on the other hand is made with thin sheets of wood that have been cut from a spinning log then glued together. Osb is made of small and fairly rectangular shaped wood chips from small resinous trees which are bonded into a panel form with wax and synthetic resin. The minimum plywood for roofing.

Plywood sheathing delivers outstanding rigidity strength and versatility and is an excellent choice for light frame wall and roof assemblies in weather protected applications. However heavier roof loads may require the use of 3 4 in cdx plywood for roof sheathing. Of course you don t need to live in a modern house to deal with a flat roof. Yes there are several different material options and types of roof plywood.

Roofs with less pitch often carry heavier loads including snow and ice accumulations in the winter. Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof. 1 2 or 3 4 inch plywood for roof sheathing. Of course flat roofs are not flat but have a very slight roof pitch of between 1 4 to 1 2 per foot.

Rafters run from the peak of the roof. Traditionally 1 2 in cdx plywood was common choice with 24 in rafter spacing.