How can I remedy a cathedral ceiling with fiberglass batts in unvented rafter bays that now emits a strong musty odor?
Investigation revealed 3 problems: 1) no soffit vent; 2) insulation extending beyond the end of plastic rafter vents closing off the air channel up to the ridge vent; 3) no blocking above the wall to seal up the fiberglass. I've corrected the first two and caulked the ridge on the inside, but am unable to fix the blocking. The odor persists and I fear the fiberglass is contaminated with mold that the revived air flow won't be able to dissipate. Would pulling out the fiberglass (through the soffit to avoid major deconstruction) and filling the bays with foam work? Would open cell work since access for closed cell is not practical? The assembly already has 1/2" foil-faced polyiso on the interior under the sheetrock. --Michael Roland
Posted Jul 25, 2014 2:30 PM ET
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