08:00AM | 11/17/02
Member Since: 11/16/02
2 lifetime posts
I have a new house in cold climate, MN. Front entry is inset 6 feet over heated basmt. What this means is there is a 6'X 6' area of basmt. ceiling that is unheated above. It is sealed and tiled above (entry floor). Originaly I insulated with fiberglass batts. This caused huge moisture problem between batts and plywood subfloor above. It will be extremly dificult to install vaper barrier around floor trusses.
Also if I do it will be imposible to check for moisture. What is proper way to insulate a basmt ceiling that is unheated above?

[This message has been edited by inwo (edited November 20, 2002).]

Jay J

03:39PM | 11/20/02
Member Since: 10/26/00
782 lifetime posts
Hi inwo,

IN this case, you'd treat your ceiling as if it was an outside wall.

You need a vapor barrier up against the COLD surface. If I understand your situation, the cold side is the UNDERSIDE of your sub-floor. When you install your insulation, put the Kraft-side of the batt up against the cold side. You'll have to do your best to try to staple it up there AND support it w/either some sort of string-type, criss-cross 'mesh', chicken wire, or those batt 'hangers/wires' that you install between floor joists. Personally, I'd go for the wires, then Plan B I'd go for some type of mesh. Bottom line - If you don't support the insulation somehow, the Kraft that you stapled will end up 'separating' from the subfloor up there and fall down. THEN, you'll have a moisture problem for sure!

My best to ya and hope this helps.

Jay J -Moderator

PS: God Bless America!


06:16PM | 11/20/02
Member Since: 11/16/02
2 lifetime posts
Thanks for your input. That seems like it might work. Unfortunately over the weekend I
did just the opposite. First I treated the plywood between joist with water seal, then insulated with 6' batts with space between batts and subfloor. Then did best I could to seal with 4mil poly under and around joists to box it in. Thought that if it gets wet again I can look thru poly and see it. Then tear it all down and try it your way.
Think if it is sealed properly, should be no way moisture can get in. BIG IF!
Won't know for sure until it stays below freezing for a few days.
Thanks again
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