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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.
If exposure 1 rated panels and sheathing do get wet edge swelling may be experienced.
At exposed roof overhangs the sheathing must be rated for exposure to the weather.
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.