We will be removing all the drywall on the west side of our central FL
home shortly, it all needs replacing due to termite and hurricane
damage. I recently saw a home improvement show that demonstrated a
spray on insulation. It was made of soy, and it expanded after being
sprayed on the inside of the outer wall. It was then cut flush with the
studs before the drywall was put in place. Our west side gets full sun,
and the rooms get measurably warmer. This is one of the long sides of
our rectangular shaped home. We've just replaced doors and windows, but
even in early June you can feel the difference from the east to west
side of the home. We currently have fiberglass batting, but it's been
damaged by water in most of the west walls. Any opinions on whether
this be a product worth looking into, and if so, who would you contact
to do this sort of work or can it be done DIY? Any ideas on how it
compares costwise to fiberglass batting replacement?
Research the material carefully.
Look for installations that have been in place for a long time.
I've seen a number of spray in or foam in products come and go.
Since it is soy based, how does it hold up with termites and rodents?
I would guess that special equipment is needed and so it's not a DIY
It has been around a few years. It is an polyurethane but with a soy oil
base. Soy is being used in many areas where other oils used to reign, such
as stains and top coats. I don't think it would be a rodent problems any
more than similar material with other bases. In the conversion process it is
no longer a food but more like a petro-chemical
stabalized cellulose maybe what you are looking for. Its a recycled
paper treated with boric acid (making it fire, mold, and pest
resistant). The stabalized part is an addition of starch, which makes
it sticky when spay through a water mist. It works waaay better than
fiberglass. You can also install it by putting a nylon netting across
the studs and dry blowing it in (I normally do this). The overall effect
is the same.
That would be the immediately economical choice. Cellulose seems to be
the most insulative per inch, and doesn't suffer from extreme
temperature R value losses like fiberglass does. The glue matrix in the
wet pack cellulose keeps it from settling, the most cited disadvantage
Another more expensive choice would be the spray on foam. about
twice the R per inch of most anything else, good air infiltration
protection (cellulose provides some as well). It might even add some
structural integrety... there are engineered panels that are
essentially plywood sheets on either side of a foam core.
Could be good in hurricane territory.
The only place I've seen a DIY source for foam is at
http://fomofoam.com ... I've been considering them for my retrofit
insulation job. (old victorian, probably balloon framing... no
insulation) They have a slow cure version that will allow for
Anyone know of any others? Always looking for options.
Ich habe keine Ahnung was das bedeutet, oder vielleicht doch?
I use Fomo's products. Very good! But not cheap.. I use foam for
air-sealing and sealing places that I can't use cellulose (wet basement
walls, cripple plates where nothing is available to hold the cellulose
in place, etc.) A word of caution using foam on frame buildings. If
you get moisure (which WILL happen in places with high humidity and
hurricanes) under the siding, the sheeting can dry out if you have
cellulose. Water vapor will pass through the sheeting, cellulose, and
the sheetrock. Foam is vapor tight. The sheeting will stay wet,
possible causing a rot problem.
Philip Lewis wrote:
I was under the impression that spray-foam insulations came in two
varieties, open cell and closed cell, and that while closed cell
insulation is vapor tight, open cell is not. So wouldn't open cell
foam work in this situation?
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