Installing Osb Roof Decking

A homeowner recently wrote and asked me the following regarding osb roof decking.

Installing osb roof decking.

Continue the woodworking project by fitting the plywood sheeting. This is usually a prerequisite in building codes. Osb is widely used as roof decking material. 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.

Curved or uneven roof trusses will cause osb roof sheathing to warp or buckle under roof coverings. In order to get a professional result we recommend you to use 3 4 tongue and groove plywood sheets. The textured surface helps flashing and waterproof underlay stay in place effectively. This instructional video covers how to store space and fasten osb oriented strand board roof sheathing including radiant barrier roof sheathing.

Oriented strand board commonly referred to as osb is a type of engineered lumber similar to particle board formed by adding adhesives and then compressing layers of wood strands. Drill pilot holes trough the rafters and insert the screws into the shed rafters after aligning the overhang at both ends. 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. When you intend to install osb sheaths try to determine the breadth or the ideal measurement of your choice of material.

You may choose between sheets that measure half an inch or 3 4 of an inch thick. Osb sheathing has different textures on both sides as well. Fitting the roof decking. Lay sheets in rows with the long edge horizontal to the roof bottom.

And scroll down to see more details on each with installation hints and tips below. Avoid installing osb with the textured side down. 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. Cover sheathing with.

Install osb textured side up. The screened surface also provides a little more traction for construction workers during installation. The minimum osb panel size is 24 inches in any direction and each sheet end must rest on a rafter. Ventilate the roof according to current building codes step 3.

Provide a 1 8 inch gap.