It is starting to get cold and nat gas prices have just gone up again. I was thinking of putting the low expanding foam in my walls, ( no insulation in the cavities, 1941 bungalow). I know it is a bit pricey compared to blown in cellulose, but it seems easier, from the inside only small 1/2″ holes. Has anyone done this, any tips out there?
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Some one on a similar thread in the ENERGY section said that one of the contractors that does spray on foam recommended against the wall foam!! I'm an old style insulator and still think cellulose is the best insulation based on cost and payback- this is what you insulate for!!
Check out the folowing links for some demo videos
http://www.tigerfoam.com/video.php
http://www.foampower.com/howto/insulate_wall_cav.html
There was a better site with a very good video, but I can't find it now.
I love foam. It seal off moisture preventing mold growth. I didn't do my ways, but my etire roof is insulated with urethane foam and I love it. But since my rafters are not covered (2x4's) I still see the lines from the rafters after a light snow. But the upstairs is always toasty.
Tim
The foam guy I talked to said that 50 year old plaster (my house was built in '57) isn't strong enough for even the low expansion foam. I would get cracking or worse. Also, in my case, there's only a 3/4" space between the masonry walls and the inside of the plaster, so not much space to fill.
I ended up tearing out the plaster on my exterior walls and putting up 2" poly iso, then furring strips and drywall. Gets me closer to R19 than the R5 or so I had.
Chris.