So something that we get asked every day is: Can you spray foam my existing walls?
The answer is yes and no. Okay let me explain. First of all spray foam is a
specific type of application of foam insulation. It's being sprayed on. This
is usually done in any kind of open area, like an attic or crawl space or a
new-build house. You can picture it because it's being done like spray paint
typically. Now I say no, because spray foam usually is not done in existing
walls. However, injection foam is done in existing walls and the main difference
for there is injection foam is a low to non expanding foam insulation, that is
installed through a hose that's placed inside of a closed cavity like an
existing wall and then it's injected into that cavity. So, let's go through the
steps of what it would take to insulate an existing wall. So, if you have, let's
say siding like vinyl siding, aluminum siding, what we do is take a strip off,
about halfway up the wall and then we drill into the cavity and we actually
place a slim-jim in the cavity feel for every single stud and we drill a hole in
every stud cavity. Now we make sure that we spiel for every
stud cavity we don't just drill every 16 or 18 inches. You'd be surprised how many
houses are out there with a 2 or 4 inch cavity that could easily be missed.
So, once we do that we inject every single cavity. We go from the bottom, to
the top with foam. If there's existing insulation in there, that's no problem at
all. It's usually fiberglass bats. What will happen is that injection foam as
it's being pumped in will just compress that fiberglass bat and then foam will
fill up the rest of the space inside that cavity. Now if you have brick for
example don't worry it can still be done. What we do is we just drill in the
mortar joints, into the stud cavity at three levels. At the bottom, middle and top of
every single stud cavity, and then same thing. We inject from the
bottom, we inject from the top, we place a marker in that middle hole so that we
know that foam has reached from the bottom and from the top. Once we do that
we top off in the middle there and we re-mortar those holes. Now there's also
the option of going from the inside of the house, like through the interior
drywall or plaster. Obviously, this is a more invasive process. A lot of
homeowners don't like this just because you know you'd have to move everything
around, it's already a noisy process with the drilling so being in the house, it
can be you know a little bit more invasive, so most people don't go for
that but it is an option. Specifically, if you have you know some type of exotic
exterior on the house, like a lot of older houses might have slate or stucco
or something like that that you don't want drilled into or even some type of
wood that's very decorative. So, going from the inside is an option but again
wood stucco slate, we can deal with those as well each one's a little bit
different. Wood, a lot of times it can be taken off. A lot of times we would just
drill through it and put a wood plug in there. Most people would just paint that
over, but again inside is an option if you don't want
that drilled through on the outside. So if you're asking yourself, you know "I'm
feeling drafts, my walls are always cold but it's an old house do I have any
options?" Absolutely, your exterior walls can easily be re-insulated with injection
foam. Hope this information has been helpful to you,
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