Sheathing A Roof Layout

This video shows how some roofs fail under heavy winds in uplift situations. The roof s sheathing helps to keep the roof trusses or rafters properly spaced and is the strength that holds. But laying out the rafters isn t as simple as duplicating the stud layout on the wall below.

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Sheath one slope of the roof at a time ripping the top course to the needed width at the ridge.

Sheathing a roof layout.

Roof sheathing panel spacing hints. When one slope is completely sheathed pop a chalk line down any slope edge as in a hip roof that needs to be cut at an angle. Spacer type panel edge clips are available from some manufacturers. The connection between the roof sheathing and the structure is a vulnerable point that is known to fail during a hurricane.

To minimize waste and to simplify cutting the sheathing courses should begin either with full or half sheets. A good sheathing job begins with proper rafter layout. A tapered piece of sheathing can be cut to fill in at the eave if necessary. During a hurricane the strength of the sheathing on the roof can greatly impact the homes ability to weather the storm.

Use a 10d box 0 128 inch by 3 inch nail as a spacer to gauge 1 8 inch edge and end spacing between panels. Roof sheathing is a lot more than just flat panels onto which shingles are attached. 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. Keep these tips in mind when roofing in hurricane areas.

Roof sheathing attaches to the surface of the rafters or trusses to form the structural skin of the roof.

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