Re: Foam-in-a-can For Wall Cavity?
- From: Wayne Whitney <whitney@xxxxxxxxxxxxxxxx>
- Date: Sun, 27 Nov 2005 20:21:45 -0600
On 2005-11-27, Greg <greg.beaulieu@xxxxxxxxx> wrote:
> I'm thinking of taking on the repair of the wall myself. It's about 6
> feet in length but only about a foot in height, between the floor and
> the windowsill.
FYI, when you replace this window, it may require safety glass. "Code
Check Building" says that safety glass is required if all of the
following are true: the window is greater than 9 square feet, the
bottom edge is less than 18" above floor, the top edge is greater than
36" above floor, and the window is within 36" horizontally of a
walking surface.
> I was wondering about using low-expanding urethane spray foam
> insulation in cans to insulate the 4 approx. 18"x12"x4" bays under
> the window. [. . .] Since the wallboard is off, I'm thinking I can
> shoot the stuff in, let it expand and cure, and if it expands out
> too much, just trim it with a saw to be flush with the studs.
I recently did exactly this for a small area of my house. It is
feasible, just be sure it is economical for you. Your volume is about
21 board feet, so you'd need 2-3 24 oz cans of "Great Stuff", assuming
that is what you are using. I used a gun-applied product made by
Toldol.
These one part polyurethane foams are moisture cured, so for thick
applications, the proper procedure is to spritz a little water into
the cavity, apply a layer 1" thick, spritz a little more water, and so
on. I found this to be a bit of a pain, it was hard to get an even
layer with a dispenser designed for laying out beads of material. I
also found that the material continued to expand for up to 30 minutes
after applying it, so I waited between each layer.
Best of luck. I like the foam insulation, but I'm going to switch to
a two part product for wall cavities. It should go faster and be
easier, although I understand it is trickier. I'll have it
professionally sprayed if scheduling permits.
Cheers, Wayne
.
- References:
- Foam-in-a-can For Wall Cavity?
- From: Greg
- Foam-in-a-can For Wall Cavity?
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