Installing Osb Roof Decking

Curved or uneven roof trusses will cause osb roof sheathing to warp or buckle under roof coverings.

Installing osb roof decking.

Check the nailing surface is level step 2. The textured surface helps flashing and waterproof underlay stay in place effectively. In order to get a professional result we recommend you to use 3 4 tongue and groove plywood sheets. Avoid putting osb on wet roof trusses.

Properly fasten panels including fastening and spacing hints step 4. You may choose between sheets that measure half an inch or 3 4 of an inch thick. 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. A homeowner recently wrote and asked me the following regarding osb roof decking.

Fitting the roof decking. 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. Avoid installing osb with the textured side down. Install osb textured side up.

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. Ventilate the roof according to current building codes step 3. The minimum osb panel size is 24 inches in any direction and each sheet end must rest on a rafter. 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.

This is usually a prerequisite in building codes. Continue the woodworking project by fitting the plywood sheeting. The screened surface also provides a little more traction for construction workers during installation. Provide a 1 8 inch gap.

Drill pilot holes trough the rafters and insert the screws into the shed rafters after aligning the overhang at both ends. And scroll down to see more details on each with installation hints and tips below. Cover sheathing with. When you intend to install osb sheaths try to determine the breadth or the ideal measurement of your choice of material.

Osb sheathing has different textures on both sides as well.