Polyiso insulation a good option for walls?
I’m planning a remodel of a bathroom in our 1920’s house and wondering whether polyiso foam boards would be a good option for insualating the stud bays (so cut to fit the bays)–I’d obviously like the most R-value as possible, but have decided against Tiger Foam because of the cost (only about 40 square feet). 3 inch panels are apparently R-19.8, obviously better than R-12ish for fiberglass/rockwool.
Any considerations to be aware of?
Thanks –
Grant
Replies
Look again at the right sized spray foam , it ought to be competitive
otherwise buy some HD cans to fill the gaps
probably spay a bead around the edges and push the panel in, then seal again the outside, err inside
What about electrical?
I would think that dealing with the electrical an plumbing would be a pain, and you would probably plan on going through 10-15 dollars worth of cans of spray foam to account for the spaces left after cutting, etc.
Fortunately I just have to deal with the toilet's water supply, otherwise the bays are empty thank goodness! For spray foam, the smallest size I could find was around $350--I was willing to pay that until I got to the checkout and shipping was $80! So, about $120 for the panels and a few small cans of foam seems like the better option...
i like gusfhb's reply. i have responded to a few rigid/spray foam threads because we did a few foam jobs recently. we found it quite difficult to get a tight friction fit when installing 3.5" polyiso between studs. the gaps should be foamed in with a hand-held dispenser (we like the hilti model). but the spray foam needs to be about 2" thick to be effective and this is difficult with smaller gaps..
I would think about doing the interior walls as well which might make the spray foam a better option. I just don't like listening to people when they are downloading huge files and I don't like getting harrassed by my wife when its me!
"Nobody needs to do that" "You're doing that on purpose" "I never make that much noise"