Roof Boards Thickness

8d ring shank nails should be used instead.

Roof boards thickness.

Most roofs will be sheathed in plywood at least 3 8 inch thick. An exception to this standard however may occur if you intend to install slate concrete or tile shingles on your roof. The typical thickness range for sheathing is 3 8 to 3 4 inch. 20 40 50 60 75 and 100 mm or as requested in between edges.

Loads will vary with the pitch of the roof. Substrate boards come in varying thicknesses as well. The concept of this system is the roofing membrane is laid directly on to the roof deck followed by roof guard boards with ship lap edges as an insulating layer with separation layer laid over it and then the final layer can be gravel or paving slabs. Sheathing should be a minimum of 19 32 inch thick.

That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. Standard roof sheathing which consists of 4 by 8 sheets of plywood or oriented strand board or osb is 1 2 inch thick and attaches directly to the roof rafters or the roof trusses.