I am doing a remodel where I am going to have cathedral ceilings and I
am trying to figure out how I am going to insulate the ceilings. I am
considering using Icynene. I have an estimate of around $1.70 per
foot. I hear and see everywhere about how expensive this is compared
to batts or cellulose insulation. However, I can not quite see how it
is 3x more expensive or, even, how it is more than rigid panels. If I
look at batts or cellulose or fiberglass UNistalled I see this but
the price for Icynene is an installed price. My question I guess is
does anybody know what the true comparison would be for Icynene
version cellulose/batts/fiberglass installed or has anybody done this
My problem is a little more complex because I have the cathedral
ceilings. I will need to build them down to get the depth for the
r-value code. So I have the time and materials for the build down
plus the insulation plus the time to fill the void or cut and staple
the batts. Given all this it seems that Icynene is an equal value.
What am I missing here?
Compare the R value of the installed products. If product "A" is going to
have a final value of R6 but another is going to be R15, you can see the
cost would be different. It may or may not be a better value
I did not mention R value for a couple reasons.
1) because I will make up for lower R value through less infultration.
By code, I can get away with using Icynene in the 6" rafter with a
lower R value because I effectively seal all leaks. My R value will
be R-21 or 25. Code is either R-30 or 38. If I do not use Icynene
then I need to build down to get the depth.
2)For me the overall difference with R value is not huge. I live in
the Pacific Northwest so the temperature difference is not severe. If
I lived where it got below 0 or over 100 then the difference in R
value would be more of an issue.
Also, this remodel is a new second floor addition so no worries about
Air infiltration is not R value if your code is r 38 someones lying to
you. Also that is a Minimun for code, more is better. Plus you need an
airspace on your cathedrial ceiling or you roofing wont last
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