mjr6550 Posted October 28, 2014 Report Share Posted October 28, 2014 I was hired by a condominium management company to look at stains on the ceilings of two units. They are not water stains. The stains go all the way through the drywall. Some wood adjacent to the drywall is also stained, and a substance has dripped on some ductwork in the attic. The units had FRT plywood that was replaced. I am guessing that this caused the stains, but I have never seen this before. Also, the FRT was replaced with an OSB sheathing that has a fiberglass reinforced Magnesium Oxide layer on the underside. This material was stained at some areas, but I would not think it could have caused the staining on the drywall. Any thoughts? Click to Enlarge 31.94 KB Click to Enlarge 15.14 KB Click to Enlarge 39.75 KB Click to Enlarge 26.89 KB Click to Enlarge 11.01 KB Quote Link to comment Share on other sites More sharing options...
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