Truss Roof Sheathing

Roofs are framed with rafters or trusses which are rafters joined by internal braces so they install as a single component.

Truss roof sheathing. The span between trusses exceeds rating of the sheathing each panel of plywood or osb has a grade stamp on one face like the example shown at below with two big numbers near the top. There are a few different terms for roof sheathing such as roof decking but sheathing is one of the more popular terms. Roof sheathing is a lot more than just flat panels onto which shingles are attached. We go in depth on how to install roof sheathing.

These trusses are positioned on the top plate of the endwall so the entire bottom chord is supported by the wall. Roof sheathing or decking is one of those elements. Any weight imposed on the end truss is directly transferred to the endwall which transfers the weight to the. End trusses close in the end of a building and provide a nailing surface for the upper end wall or rigid sheathing.

Nails size 8b should be installed every 6 inches on edges and every 12 inches in the center area. In the u s roof sheathing is almost always composed of wood usually osb oriented strand board or plywood. The trusses and beams of the roof give the roof its initial pitch and structure and then the sheathing is applied so the actual underlayment and roof covering can be applied. Rafters run from the peak of the roof.

Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should someone walk on the roof. The minimum plywood for roofing. Most houses contain a weak link in the connection of the roof sheathing to the rafters or roof trusses making them vulnerable to loss of roof sheathing in severe winds but solutions to this. Install sheathing perpendicular to roof trusses one slope at a time.

The first one is the rated span in inches for roof sheathing the second number is for flooring and the stamp will be visible from inside the attic. The skeleton of a roof is formed with rafters or trusses generally spaced 16 inches or 24 inches apart from the center of one rafter to the center of the next. Start the sheathing at the eaves and work your way up to 1 inch from the peak.