"Scott Mathers" wrote in
message ...
: Pop wrote:
: "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.
:
:
: Hmm, good point on the vapor barrier... What would I do?
:
: I was thinking of blue board, then 5/8" fireshield on top of
it.
: I just finished insulating my attic! It was woefully
under-insulated, I
: live in NY and only had 3.5" in most of the house.
:
: Thanks for all of the replies guys!

Basically, just damage the previous vapor barrier. Slash it up,
whatever, so air/moisture can get thru it. Kind of depends on
the situation.

Pop