Open-cell spray foam vs. Roxul
Again I am asking insulation questions. I have a bid for a full foam compliment in my new construction home. They want to do 4" of open cell in the exterior walls trouble is my walls are 2x6 and it just doesn't make sense to leave that area open to me plus the foam performs best at 4" thick so I understand the cost difference for payback on no the extra inch is tough to justify.
R-14 in the stud bays with the r-9 outside with polyiso just seems a little short on r value to me??? Seems like I can do better.
I'm in 47460 with 1.5 inches of polyiso foam on the outside. I am really struggling with this decision because I simply am running out of options.
Dense pack cellulose is not an option in my area, wet sprayed cellulose contractor gets horrible reviews and I don't think I want the wet inside the wall cavity.
Some of you have recommended getting a power caulk gun, sealing the stud voids and installing the batts on my own....I think I would have a better r value in the end with the batt but honestly it's turning out to be a budget thing. Cost wise am I getting more bang for my buck with the foam?
This is killing me with all the variables and I just want to make sure I am getting the most r value for my dollar. If that is batts then so be it. Please help
Posted Thu, 09/04/2014 - 16:33
Edited Fri, 09/05/2014 - 05:22
Other Questions in Energy efficiency and durability
Best practices ideas for retrofitting existing PWF built in muskeg and best practices for foundations for new builds in muskeg (i.e. very wet !) and a severe cold climate