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Vapor Barrier Seals

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Posted by The New Charter on November 20, 2004, 5:35 am
   I am looking for some of the seals that you place in a wall to vapor-seal
outlet boxes. In the past I knew of some that went up and then you placed
the box inside. after everything else was done, you'd seal it to the film
and wires.
    Anyone have experience/stories with these?
    Also heard that there are new types out now that have sealing rings for
the box as well as the wires.
    Anyone have experience/stories with these?
    I am getting to the wiring stage in a major renovation at my house. I
sure would like to keep a continuous vapor barrier. Saving energy and
keeping moisture out of the fiberglass insulation here in New England seems
worth the extra effort -if I can afford it.

Dave Hunt

Posted by m Ransley on November 20, 2004, 1:05 pm
Any box store has them, foam seals in packs of maybe 10

Posted by SQLit on November 20, 2004, 3:11 pm


Not sure of what your talking about. I have never heard of anything that
goes around the box. All I have ever used was spray foam when vapor was an

Living in the SW it seems to me your worried about something to small to
care about. I have never lived in NE, grew up in Wisconsin in an home that
was turn of the 19th century. I do not remember leaks from the outlet boxes.
Windows and doors oh yea.

Posted by David Baillie on November 21, 2004, 3:40 am


Hi Dave well as a carpenter in Ontario I can tell you what we would do here
and it's pretty much a standard for the US too.  They sell the plastic
vapour barrier shaped like an outlet box that gets tacked between the stud
and the outlet box when you do your electrical rough in.  Home depot has
them.  If you're feeling more frugal a piece of 6 mil poly about 18" square
will do but it's harder to seal up after.  So anyways once you're rough in
is done the wires that exit the box are tuck taped to the plastic to seal
the hole.  After insulating when you vapour barrier cut a hole a few inches
larger then the box and tuck tape the two layers on poly together.  Voila! a
perfect unbroken vapour barrier...
Cheers,           David

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