Is Roof Sheathing Required

Solid sheathing required for wood roofs in high wind areas.

Is roof sheathing required.

If your roofing contractor is doing a reroof which is where the new roof is applied over the existing roof the upgrade of the sheathing is not required. Roof sheathing or decking is one of those elements. Rafters run from the peak of the roof. The minimum plywood for roofing.

They only apply for roof replacement where the previous roof is completely removed down to the sheathing. Solid sheathing is also recommended in areas subject to windblown snow. Sheathing should be a minimum of 19 32 inch thick. In the u s roof sheathing is almost always composed of wood usually osb oriented strand board or plywood.

A strong resilient roof is a home s first line of defense when the roof deck is exposed to weather. Roofs are framed with rafters or trusses which are rafters joined by internal braces so they install as a single component. The rsrs designation indicates the fastener is a ring shank roof sheathing nail. The typical thickness range for sheathing is 3 8 to 3 4 inch.

In areas where the average daily temperature in january is 25 f 4 c or less solid sheathing is required on that portion of the roof requiring an ice barrier. Sheathing thickness is greater than 15 32 inches roof sheathing is required to be fastened with astm f1667 rsrs 03 2 0 131 nails or astm f1667 rsrs 04 3 0 120 nails. Never attach roof sheathing with staples. Table r803 2 3 1 specifies the maximum fastener.

This is required in areas of high wind or seismic activity and wherever else a solid roof diaphragm is required by code. Zip system roof assembly combines our revolutionary integrated sheathing and flashing tape or liquid flashing to provide a sealed roof for protection against moisture intrusion during construction or if high winds strip the roof covering away. Terrell you can build a roof without sheathing. But it s just a one time reprieve.

8d ring shank nails should be used instead. Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should someone walk on the roof. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. R905 8 2 deck slope wood shakes shall only be used on slopes of three units vertical in 12 units horizontal 25 percent slope or greater.

H clips provide additional stiffness between bearing points for the unsupported edges of wood panel plywood or osb roof sheathing along with the necessary 1 8 gap for expansion as shown below illustrated on a bag of simpson h clips.