Roof Sheathing Designs

Blocking of unsupported edges may be required near gables ridges and eaves follow design drawings.

Roof sheathing designs.

Sheathing layout install sheathing panels according to the recommendations of the engineered wood association apa. Plywood sheathing delivers outstanding rigidity strength and versatility and is an excellent choice for. Common roof sheathing applications and installation recommendations are described in the related publications listed at right. It adds proven performance and durability to new homes room additions and renovations.

Slate and slate type shingles. In the u s roof sheathing is almost always composed of wood usually osb oriented strand board or plywood. It spans the rafters to support the roofing and in the case of panel sheathing such as plywood or osb it acts as a diaphragm with the walls to resist horizontal loads. A combination roof is quite literally a combination of types of roofs.

Unless otherwise indicated by the panel manufacturer leave a 1 8 inch gap. Use panels no smaller than 4 feet long. Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should someone walk on the roof. Correct installation of roof sheathing will ensure the best performance and help reduce complaints and callbacks.

Cap nail shank and cap staple legs shall have a length sufficient to penetrate through the roof sheathing or not less than 3 4 inch into the roof sheathing. Often incorporating two or more designs for aesthetics and practical reasons combination roofs can feature a range of styles. Roof sheathing or decking is one of those elements. Roof sheathing attaches to the surface of the rafters or trusses to form the structural skin of the roof.

Plywood and oriented strand board osb are used in roof sheathing systems ranging from simple single family residences to large commercial buildings. For prescriptive roof sheathing applications provisions of the american wood council s awc s wood frame construction manual wfcm figure 2 1g or 2 1h can be followed. Table m9 2 1 of awc s companion document the asd lrfd manual for. A clerestory and hip roof for example.

Where the roof sheathing is less than 3 4 inch 19 1 mm thick the nails. Plywood sheathing is ideal for residential and light plywood sheathing is ideal for residential and light construction and every piece meets the highest grading standards for strength and appearance. For all other conditions the basic capacity checks of awc s national design specification nds for wood construction chapter 9 apply.