... standed of BS EN 300, we can sort the OSB into four grades as follows:OSB-1:it can be used ... against corrosion and fire, water proof, consistent when exposed in the natural or wet environmet, Low formaldehyde emission, Good nailing strength ... filed4. Usage:Can be used for roof decking, roof sarking, wall sheathing flooring, packing, hoarding, signboards and portable building, constructional insulation ...