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#1
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4 mil vapor Barrier versus 6 mil ??
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 for $50. 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 barrier? Thanks, Chris |
#2
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4 mil vapor Barrier versus 6 mil ??
On Sep 20, 7:49�pm, wrldruler wrote:
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 for $50. 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 barrier? Thanks, Chris might be ok if all seams sealed and overlapped. but plastic isnt forever. how old is it? if your getting a permit run it by the local code enforcement building inspector |
#3
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4 mil vapor Barrier versus 6 mil ??
On Sep 20, 11:04*pm, " wrote:
On Sep 20, 7:49 pm, wrldruler wrote: 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 for $50. 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 barrier? Thanks, Chris might be ok if all seams sealed and overlapped. but plastic isnt forever. how old is it? if your getting a permit run it by the local code enforcement building inspector- Hide quoted text - - Show quoted text - 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 barriered? |
#4
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4 mil vapor Barrier versus 6 mil ??
On Sat, 20 Sep 2008 16:49:31 -0700 (PDT), wrldruler
wrote: 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 for $50. 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 barrier? Thanks, Chris Hi Chris, 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 of moisture. 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, -- Kenneth If you email... Please remove the "SPAMLESS." |
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