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


Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.


type the code from the image


Post_new_button or Login_button

This garden shed has been decked out to the nines. Designer Orla Kiely created the intimate home for a flower trade show, ... Built on a rocky island in the Drina River, near the town of Bajina Basta, Serbia, this wooden house was cobbled together ... Large steel-framed windows flood the interior of this remodeled Michigan barn with daylight. The owners hired Northworks A... Edging formed with upside-down wine bottles is a refreshing change. Cleverly and artistically involving recycled materials... A Washington State couple called on BC&J Architects to transform their 400-square-foot boathouse into a hub for family bea... Similar to the elevated utensil concept, hanging your pots and pans from a ceiling-mounted rack keeps them nearby and easy... For windows, doors, and mirrors that could use a little definition, the Naples Etched Glass Border adds a decorative flora... The thyme growing between these stepping stones adds a heady fragrance to strolls along this lush, low-maintenance garden ... Decoupage is an easy way to add any paper design to your switch plate, whether it is wallpaper, scrapbook paper, book page... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... When securely fastened to a tree or the ceiling of a porch, a pallet and some cushioning make the ideal place to lounge. V... Reluctant to throw away any of those unidentified keys in your junk drawer? Hang them from a few chains attached to a simp... A stripped-down model, sans screened porch, starts out at $79,000. Add the porch, a heated floor for the bath, and all the... Salvaged boards in varying widths and colors make up the dramatic accent wall in this attic space. The high-gloss white of... Need a window and a door in a tight space? A Dutch door with a window may be your answer. These useful doors are split hor...
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon