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SCENARIO – Winter in Minnesota, -30 degrees: If you provide proper venting for a vaulted ceiling (soffit intakes, baffles, ridge venting), doesn’t that create a hot/cold transition area within the joist space that will make for problems with the ceiling itself? There must be a plane where the heated air rising through the sheetrock meets the cold venting air which should create condensation, somewhere in the area of the fiberglass insulation. It seems that the integrity of the sheetrock is being sacrificed to save the roof deck.(thanks to Gabe for the help so far).
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VENT! VENT! VENT!
Vent the SOB!
*heated air does not rise through sheetrock!!!Heated air rises through holes in the sheetrock and top plates of the walls and the open tops of plumbing chases. A poly vapor barrier will have the same achilles heel as the drywall. BTW the poly really does nothing for you, as moisture transport due to convection is 100 times more effective than moisture transport through the drywall by vapor pressure.The leaking air is the problem - focus on stopping it.and FYI - you don't need condensation to get mold. The resultant indoor air, cold air mix need only be 80% RH to get biological activity.-Rob
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SCENARIO - Winter in Minnesota, -30 degrees: If you provide proper venting for a vaulted ceiling (soffit intakes, baffles, ridge venting), doesn't that create a hot/cold transition area within the joist space that will make for problems with the ceiling itself? There must be a plane where the heated air rising through the sheetrock meets the cold venting air which should create condensation, somewhere in the area of the fiberglass insulation. It seems that the integrity of the sheetrock is being sacrificed to save the roof deck.(thanks to Gabe for the help so far).