Philadelphia Fiberglass Services commented on a video on YouTube.
The effects of moisture vapor migration through walls  and ceilings and condensation at the dew points on the exterior skin of buildings are showing themselves in today's construction.  This would occur with or without vapor barriers but moisture would dry far better if the walls were not insulated, like it was in the 1800's.  As for the exterior, modern claddings are plagued with bad methodology and poor installation practices.  Some of these materials should be outlawed and would be if it were not for the petrochemical mega corporation lobbyists.  As for interior vapor barriers, I am in favor of an interior vapor barrier in the northern climates where the heating season is extended.  For the exterior, it should be open or minimally covered in underlayment and without inhibiting barriers and housewraps, with true watershed and primary weather cladding. Never should an underlayment be accepting precipitation runoff.  The “permeable” housewraps are not so permeable once the temperatures drop.  They become vapor retarders producing dew points beneath the cladding.  Venting is beneficial but is not the answer for interior moisture.  Some seem to think that exterior moisture allowed into the basement or crawlspace in the winter causes the interior moisture to rise.  This is not the case.  There is less moisture held in cooler air than in warm air.  Interior moisture needs to be addressed at the source.  Mold is serious and to discount it is to do the public a disservice.   I agree that there are “experts” running around swindling the public.  I agree 100% that a company rendering the remedy should have a firm grasp on building methods.  The problem is that the opinions are diverse and the education obtained by these “experts” is skewed by corporate interests.
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