I have a brick/block home with no insulation. Behind the drywall are
furring strips and then a course of cinderblock. So there is no real room
for blown-in insulation, and contractors say it isn't worth it.
I was thinking about the idea of insulating just one cold BR on the north
side with that expanding spray foam. Dow's website says it won't cure
properly in an enclosed space. My house is pretty drafty, so I was thinking
of drilling some holes around the top perimeter, spraying, then waiting a
day, and work my way down the wall, and so on.
Any thoughts on this?
Can you get to the insides of the block? If so, pour in ground up expanded
polystyrene beads. There are some companies that do that for new
construction, but I don' tknow how easily it is done on old houses.
As for your idea for using foam insulation in your walls, I am
not qualified to give you advice on that project.
However, if you go this route, you will find that to insulate an entire wall
using multiple cans of Great Stuff will be quite costly. If expanding foam
is your choice, consider ordering in bulk. I picked up a 16
pound tank of Handi Foam from Tek Supply complete with nozzle
and hose for much less than it would have cost using Great Stuff.
They are online at, www.teksupply.com but the shop online
section never seems to be up when I check. I've ordered the
tanks of foam twice from them over the phone, good service both
David P. Feyen Reply to: dfeyen at wi dot rr dot com
I'd be nervous about the expandable foam just separating the block
from the fir strips. [not to mention the cost & aggravation]
Have you priced 1-2" styrofoam panels & new sheetrock? I
daresay the job would be just slightly more work, but your insulation
value would be 3-4 times as high. [you can go to 2" thick, and you'll
have no voids] By the time you get done patching all the holes
you'll need for the 'great stuff' application, you might as well put a
skim coat on new sheetrock.
Dow makes a product called 'wall mate' that leaves a groove for 1x4
fir strips for mounting your sheetrock. Spot glue the styrofoam to
the wall - screw on the fir strips-- mount the sheetrock. . .
I had an older home in Tempe AZ. I called a company called Thermal
Advantage. For 900 bucks they drilled the block in the gout areas and pumped
in foam into the block wall. House was noticeable quieter and energy use. I
made them pump the garage wall which was common with the dining room and
kitchen. You could not hear the dryer any more nor a car running in the
garage. Also the walls were not warm to the touch in the summer time on the
inside. If I ever have an other block home I will give them a call.
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com ).
I've used this product. It expands, and keeps expanding. One friend of mine
foamed in the sides of his door frame (between the door frame and the sides
of the storm door). It expanded so much that it pushed the sides of the
frame in. Now, the door won't shut.
I doubt that the concrete blocks are all that "enclosed". Concrete is
porous, and there's always a bit of air leak between the blocks. I've used
lots of the stuff and find it great.
Just be aware that the stuff can exert quite a bit of expansion force, so
make sure there's an escape hole or you risk bowing out the drywall.
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