What is this?

Noidios

Member
Joined
Oct 20, 2007
Messages
169
Location
Anderson, SC
Name
Russ Zinck
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.

20200212_135526.jpg
 

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