At exposed roof overhangs the sheathing must be rated for exposure to the weather.
Roof sheathing exposure.
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If exposure 1 rated panels and sheathing do get wet edge swelling may be experienced.
Wood structural panels when designed to be permanently exposed in outdoor applications shall be of an exterior exposure durability.
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.