Roof Sheathing Should Be Installed

This can cause a problem because while the hip trusses maintain their normal spacing e g.

Roof sheathing should be installed.

For plywood composite or osb boards installed on rafters it should be at least 5 8ths of an inch thick. Slide the sheet one rafter width over the end of the roof so the edge is centered on the next rafter offset one rafter spacing from the first piece of installed sheathing from the row below. Tongue and groove installations require thicker material at least 1 1 2 inches thick as they don t often require insulation and often double as the ceiling. 24 inches on center the actual distance between panel supports measured along the slope is greater than the truss spacing.

Sheathing is installed perpendicular to roof trusses. If the top chords of trusses or rafters are warped or bowed install blocking to straighten. Trusses or rafters should be shimmed as necessary to provide a level nailing surface. In this case to keep the panel s strength axis perpendicular to the hip trusses the panels on the hip roof portion must be installed with their long dimension oriented up and down the slope.

8d ring shank nails should be used instead. The first thing we check is the thickness of the material used. Sheathing should be a minimum of 19 32 inch thick. There should be at least 3 8 inch of space between the fastener and the panel edge.

Local roof repair contractors inspect the sheathing during maintenance repairs and especially during roof replacement. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. This can be done with a straight piece of lumber 6 feet to 10 feet long or a long carpenter s level.