Roof Sheathing Exposure

The everyday sheathing used on the body of a roof is not rated for weather exposure so when exposed eaves and or rakes occur at the perimeter a different more expensive weather rated grade of plywood or osb must be used. Wood structural panels when designed to be permanently exposed in outdoor applications shall be of an exterior exposure durability. At exposed roof overhangs the sheathing must be rated for exposure to the weather.

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Roof sheathing exposure.

If exposure 1 rated panels and sheathing do get wet edge swelling may be experienced. It s also suggested that exposure 1 rated sub floor panels and rated sheathing be stored under tarp or roof with adequate air circulation to keep them protected from prolonged rain or snow. In order to prevent damage cut the steel bands on the bundles. Wood structural panel roof sheathing exposed to the underside shall be permitted to be of interior type bonded with exterior glue identified as exposure 1.

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