Oriented strand board isn t plywood nor is it a type of particleboard fiberboard or wafer board and although it is a newcomer to a plywood dominated market its use for exterior sheathing is.
Osb roofing material.
However the board is lack of natural moisture inside and won t dry as quickly as plywood.
Sheets of 7 16 inch thick with no edge support can be used in an area where the snow load is 30 pounds per square foot.
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1 x 6 roof decking doesn t qualify.
Installation of a new roof covering over an existing roof covering is only permitted if the roof decking is solid plywood or osb sheathing.
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Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb.
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Osb is made out of strands of wood chips and chemically engineered materials to glue them together.
With edge support and the same snow load 3 8 inch osb can be used.
As the result they are stronger and basically water proof.