kurt Posted January 10, 2006 Report Share Posted January 10, 2006 Anyone want to see what happens when a goofy interior designer is entrusted to design details? Little 2.4 mil house in the City; when the fancy new siding was put on the exterior, the designer thought laying 1/2" drywall as sheathing and covering the exterior w/WR Grace was a good idea. He also must have read a book somewhere, because he has a vapor barrier on the interior too. Add a busted duct boot in the attic/plenum to drive conditioned humidified air into the plenum, mix, & wait. It took about 2 years to rot out the parapet framing. Condensation can be a real beyotch..... Download Attachment: rot wall.jpg 62.98 KB Download Attachment: rotten.jpg 59.78 KB Download Attachment: vapor barrier rot.jpg 44.88 KB Quote Link to comment Share on other sites More sharing options...
Terence McCann Posted January 10, 2006 Report Share Posted January 10, 2006 That's just plain ugly. Was it brick veneer on the front? If so any weep holes? Quote Link to comment Share on other sites More sharing options...
kurt Posted January 11, 2006 Author Report Share Posted January 11, 2006 Yes and yes. The busted duct was pressurizing the "attic" plenum, forcing conditioned air up into the parapet, & dew point was taking care of the rest. You would not have believed the amount of moisture we wrung out of this joint; it was saturated. Flashing wouldn't have helped because the dodo put the WR Grace outside the frame & inside the brick; the water never got to the brick, it just condensed & soaked into the framing & insulation. This was about vapor barrier confusion more than anything else, at least that's what I think. It was an object lesson of what happens when one "sandwiches" building materials between 2 vapor barriers. Quote Link to comment Share on other sites More sharing options...
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