The worst situation is a preexisting condition where there is a vapor
barrier on the outside, such as felt paper, and fiber glass batt
insulation with a craft paper facing is put on the inside wall face
underneath the sheetrock. This is destined for rot as vapor collects
between the two vapor barriers, saturates the insulation, and causes
the studs, weatherboards and sills to rot. The best thing, of course,
is to avoid installing this, but if you have it already you should
drill holes about the size of a quarter and install little aluminum
louver filled circles about the size of a quarter in them, making sure
to pierce the exterior vapor barrier in the process. This will let
the accumulated moisture out of the wall cavities between the studs.
You need a little louver installed through the weatherboards between
each stud right above the sill.
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