Noidios
Member
Opened up an exterior wall today and fond this white stuff on the plywood. There were traces of the same material higher up the wall - almost like it had dripped down.
The structure is kind of an A-frame so asphalt shingles on the other side of this plywood. White stuff in question wiped right off the plywood completely with no effort.
The structure is kind of an A-frame so asphalt shingles on the other side of this plywood. White stuff in question wiped right off the plywood completely with no effort.