Posted by John in La on June 13, 2010 at 04:37:41 from (72.150.10.160):
Doing some work at my sisters rental house between tenants and found a problem I do not know what to do.
Let me see if I can explain this.....
This is a house that is 50 to 60 years old. The rear of the house is 2 bedrooms; 1 on each side. The house has a cathedral ceiling in this area and the wall separating the 2 rooms is right in the center of the house so it goes all the way up to the very peak of the cathedral ceiling.
I found damp and soft sheetrock about 18 inches by 18 inches on the exterior wall right in the very peak of the cathedral. The wall between the 2 rooms is sound with no moisture. The ceiling is sound with no moisture. It is only damp on the exterior wall and only a 18x18 inch spot right in the very peak. Both rooms show the very same condition.
Thinking we have a leak from the outside in I pulled down about a 2ft square piece of sheetrock in each room. While my nose is not very good sister says she smells mold as I was tearing this sheetrock down. Found the paper (vapor barrier) was also damp to the touch but the insulation was dry.
Now the problem........... I was expecting a water leak from the outside BUT the 2x4's are dry. You can see up to the under side of the roof and it is clean and dry. The exterior wall has (from inside out) black tar paper; shiplap wood siding; and aluminum siding over that. All of that looks and feels dry. I can not see where any water is getting in from the outside anywhere. Striking the 2x4's with a hammer shows they are very sound so I do not suspect bugs such as termites.
Only thing I can figure is the problem is condensation. About ready to put up new insulation and a clean piece of sheetrock and let it go. Just can not figure out why the only damp moldy spot I can find in the whole house is this wall.
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