Laying Osb On Roof

Thicknesses range from 5 16 to 3 4 inch and the proper one to use.

Laying osb on roof.

When a roof is abutting a wall at the perimeter of the roof allow 2mm per meter for the distance that the roof protrudes from the wall for expansion purposes. And scroll down to see more details on each with installation hints and tips below. 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. Overall in installing a whole roofing area osb will cost you 700 to 1 000 cheaper than plywood.

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. 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. For example it does not have voids or knots or gaps and laps. The minimum osb panel size is 24 inches in any direction and each sheet end must rest on a rafter.

Osb sheathing is a special type of board that is well engineered being composed of strands of compressed wood which are layered and unionized together using a resin. Avoid putting osb on wet roof trusses. When osb is used as a structural panel it must adhere to specific span ratings specified by the. The proper way to install osb span ratings.

Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones. Cover sheathing with. Avoid nailing or stapling edges of osb panels. Stagger the panels over the roof with 2 supports between panel ends.

It is generally believed that osb is cheaper than plywood. Ventilate the roof according to current building codes step 3. Check the nailing surface is level step 2. Select osb sheets.

For plywood it is like 5 to 10 more expensive. Avoid butting osb panels tightly. It differs from commonly used plywood in many aspects. Osb and ply gaps leave a 3mm gap between all edges of any 8 x 4 board if the roof is very large or unusually long check that you don t need expansion breaks as well.