Jerry Simon Posted November 15, 2014 Report Share Posted November 15, 2014 Any opinion on this black splotching on the underside of the OSB sheathing in an attic? Click to Enlarge 49.56 KB Link to comment Share on other sites More sharing options...
Jim Katen Posted November 15, 2014 Report Share Posted November 15, 2014 Looks like paint or ink spatter from the process that stamps the grade marks on the wood. Link to comment Share on other sites More sharing options...
Mark P Posted November 15, 2014 Report Share Posted November 15, 2014 I agree, it came from the factory like that. Link to comment Share on other sites More sharing options...
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