Converting 300 sq ft garage into family room. Installing full floor
above garage concrete slab. I want to put a polyethylene vapor barrier
on the concrete.
Most places I read recommend 6 mil polyethylene. Home Depot selling
When cleaning out the garage I found a brand new box of 4 mil
polyethylene that my Dad had given me.
Would it be a problem if I used the 4 mil that I have, instead of
buying 6 mil?
I have a giant box. Can I double-up the 4 mil, creating a 8 mil
Prob Ok if never exposed to sunlight!
But 300sq ft. of 6 mil not very expensive? Assuming you have to
insulate and vapour barrier the walls (unless they are already
insulated and vapour barriered) use the 4 mil for that? Also what
about the ceiling insulation and vapour barrier for a room that will
now be heated, occupied by living breathing people and other
activities that put out moisture; is that insulated and vapour
On Sat, 20 Sep 2008 16:49:31 -0700 (PDT), wrldruler
Polyethylene is an extraordinary VB.
(I won't bore you with the details, but I use .1 mil for
certain purposes, and it does the job.)
So, in your situation, the issue is fragility rather than
the thickness needed to provide a barrier to the migration
I would say "yes," you could use the 4 mil (and be careful
to avoid tearing it.) Or, double it, and sleep a bit better.
All the best,
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