Stains in sheetrock
#1
10-14-10, 12:07 PM
Join Date: Jan 2006
Location: US
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Stains in sheetrock
I sheetrocked over the back of an interior fireplace wall made of cinder block a few years ago. I have noticed for some time there seems to be a water stain gradually working its way down the wall, but when you touch it its like sap from a tree. I never noticed any moisture on the cinder block before I rocked it. I don't see any signs from a leak above in the attic. I have made sure where the chimney meets the roof shingles is sealed with tar. Didn't think there was a need for vapor barrier but maybe there is? Any ideas would be much appreciated. Thanks.
#3
10-15-10, 11:44 AM
Join Date: Jan 2006
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#4
10-16-10, 04:38 AM
I don't know for sure but it's probably from lack of insulation and vapor barrier. It would have been nice to have 3/4" foam between the drywall and the block.
If the drywall is dry, you can use a solvent based primer to cover the stain and then repaint but if the cause of the stain isn't fixed, I'd expect the problem to return
If the drywall is dry, you can use a solvent based primer to cover the stain and then repaint but if the cause of the stain isn't fixed, I'd expect the problem to return
