That is Oriented Strand Board (OSB), typically used for sheathing. Looks like it has been used exposed to weather, which is not its intended use. There is no reasonable repair for that, other than r ... read more
We're redoing my parents roof and their chimney needs some repair work as well. Is it better to do the masonry work before or after we do the rest of the roof?
The masonry work should be performed prior to repairs to the existing roofing, unless the roof is leaking, whereupon you may need to make intermediate repairs to stop the leaking while the masonry wor ... read more