"SQLit" wrote in message
...
:
: "Scott Mathers" wrote in
message
: ...
: I am thinking of adding insulation to our attached garage
wall, to
: increase the insulation between the living space. Is adding
Dow
: styrofoam board or something similar a good idea, or worth
the cost?
: (It's more flammable than the 5/8 fireshield)
:
: For example, the Dow 1" stryofoam board would add R5 to my
wall, which
: is only 3.5" with R-11 fiberglass.
:
: Thanks guys!
:
: Exposed foam is a fire fuel looking for an ignition source.
Please provide
: the source for this foam board. with 1" equals R-5... I bet you
did not read
: the whole listing. This rating is part of an assembly.
:
: More insulation in the attic seems a better bet. I added R-30
this summer
: and cut the a/c bills in half from July to August and more than
40% since.
:
:
No, he's apparently looking at the "blueboard" type stuff, or
pink, whichever. Codes here do say it needs to be covered
though, which makes sense anyway; being exposed leaves most
anything susceptible to damage. In fact, that's stamped right on
the blueboard - I just looked at a leftover piece on the porch.

While I'm thinking of it; the OP should also beware the
possibility of the foam boards, creating a second vapor barrier -
shouldn't let that happen - easy to remedy if the wall's are
going to be opened at all.