Correct installation of roof sheathing will ensure the best performance and help reduce complaints and callbacks.
Roof sheathing designs.
A combination roof is quite literally a combination of types of roofs.
Common roof sheathing applications and installation recommendations are described in the related publications listed at right.
Staples shall be not less than 21 gage.
Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should someone walk on the roof.
Often incorporating two or more designs for aesthetics and practical reasons combination roofs can feature a range of styles.
In the u s roof sheathing is almost always composed of wood usually osb oriented strand board or plywood.
It adds proven performance and durability to new homes room additions and renovations.
Roof sheathing or decking is one of those elements.
Plywood sheathing delivers outstanding rigidity strength and versatility and is an excellent choice for.
Slate and slate type shingles.
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.
For all other conditions the basic capacity checks of awc s national design specification nds for wood construction chapter 9 apply.
Sheathing layout install sheathing panels according to the recommendations of the engineered wood association apa.
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.
Where the roof sheathing is less than 3 4 inch 19 1 mm thick the nails.
Blocking of unsupported edges may be required near gables ridges and eaves follow design drawings.
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.
A clerestory and hip roof for example.
Use panels no smaller than 4 feet long.
Fasteners for asphalt shingles shall be galvanized stainless steel aluminum or copper roofing nails minimum 12 gage 0 105 inch 2 67 mm shank with a minimum 3 8 inch diameter 9 5 mm head of a length to penetrate through the roofing materials and a minimum of 3 4 inch 19 1 mm into the roof sheathing.
Unless otherwise indicated by the panel manufacturer leave a 1 8 inch gap.
Roof sheathing attaches to the surface of the rafters or trusses to form the structural skin of the roof.
Table m9 2 1 of awc s companion document the asd lrfd manual for.
