Roofing Osb Upside Down

Watch this now to learn how to avoid this same pr.

Roofing osb upside down.

The side with the grade stamps is intended to be installed down to allow for the stamps to be visible from an unfinished lower level. When the grade stamp is covered by roofing the building inspector will not be able to confirm that the correct osb roofing panel was used. 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. Roof trusses must be dry when sheathing a roof with osb to prevent mold growth in the roof and coverage gaps as the trusses dry and shrink.

I m halfway though sheeting the roof of my shipping container shop and already need to redo some of it. Install osb textured side up. Structurally it doesn t make a difference but if the grade stamp faces up it will be covered by the roofing material and the building inspector will not be able to confirm the right osb panel has. There are little targets placed all over the surface and it s almost impossible to not want to put the green cap directly on the target.

Avoid putting osb on wet roof trusses. It s also funny watching carps installing one of the new roof products that replaces felt. The textured surface helps flashing and waterproof underlay stay in place effectively. The screened surface also provides a little more.

Curved or uneven roof trusses will cause osb roof sheathing to warp or buckle under roof coverings. Osb roof panels should always be installed with the grade stamp facing into the attic and the screened surface with the nail guide lines facing up. Avoid installing osb with the textured side down.