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Posted by cece e. on July 13, 2006, 11:07 am
Now everyone in homerepairlive land is confusing me. I was told by someone
that I could use polystyrene instead of fiberglass to insulate my HUGE
crawl space and it will have and R10 value opposed to the R13 value of the
fiberglass. I first asked the question what does the "R" mean then I asked
is polystyrene (styrofoam) just as good as fiberglass to help keep in
heat. Could someone simply say yes or no. Is polystyrene good, safe and
effective to use for insulating a HUGE crawl space?
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Posted by Edwin Pawlowski on July 13, 2006, 11:19 am
> Now everyone in homerepairlive land is confusing me. I was told by someone
> that I could use polystyrene instead of fiberglass to insulate my HUGE
> crawl space and it will have and R10 value opposed to the R13 value of the
> fiberglass. I first asked the question what does the "R" mean then I asked
> is polystyrene (styrofoam) just as good as fiberglass to help keep in
> heat. Could someone simply say yes or no. Is polystyrene good, safe and
> effective to use for insulating a HUGE crawl space?
The R value will depend on the thickness of the material. Dow Styrofoam
blue board that is 2" thick will have an R-10 value. If you double the
thickness, it will be R-20. EPS bead board is R4 per inch. I have 2 1/2"
in my garage.
Yes, it is a good, safe material. It is treated with a fire retardant
additive to meet building codes. It is CFC free, can be recycled. It does
not support insect or rodents.
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Posted by J. Clarke on July 13, 2006, 11:49 am
cece e. wrote:
> Now everyone in homerepairlive land is confusing me. I was told by someone
> that I could use polystyrene instead of fiberglass to insulate my HUGE
> crawl space and it will have and R10 value opposed to the R13 value of the
> fiberglass. I first asked the question what does the "R" mean then I asked
> is polystyrene (styrofoam) just as good as fiberglass to help keep in
> heat. Could someone simply say yes or no. Is polystyrene good, safe and
> effective to use for insulating a HUGE crawl space?
Yes, it's good, safe, and effective.
Main issue is whether the crawlspace is reasonably close to being
airtight--if it's well ventilated then insulating it is not going to do
much good--you'd do better to insulate the floor.
If the crawlspace is tight enough to be worth insulating then consider
whether it is likely to get wet--if so then you want something that won't
wick moisture--that would be closed-cell foam, not fiberglass.
You might find
<http://www.eere.energy.gov/consumer/your_home/insulation_airsealing/index.cfm/mytopic=11620>
to be helpful.
--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)
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Posted by on July 13, 2006, 12:02 pm
cece e. wrote:
> Now everyone in homerepairlive land is confusing me. I was told by someone
> that I could use polystyrene instead of fiberglass to insulate my HUGE
> crawl space and it will have and R10 value opposed to the R13 value of the
> fiberglass. I first asked the question what does the "R" mean then I asked
> is polystyrene (styrofoam) just as good as fiberglass to help keep in
> heat. Could someone simply say yes or no. Is polystyrene good, safe and
> effective to use for insulating a HUGE crawl space?
Not wanting to confuse, but you should understand that any such R-value
implies no air movement past the insulant. Read that: sealed along
edges/whatever. Paper flanges on fiberglass, if properly stapled, do
that. With board insulant, be prepared to custom-fit around/inside
obstacles, and caulk. Been there, done that. Not rocket science- intro
physics.
J
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Posted by JimL on July 13, 2006, 12:55 pm
On Thu, 13 Jul 2006 10:07:19 -0500, "cece e."
>Now everyone in homerepairlive land is confusing me. I was told by someone
>that I could use polystyrene instead of fiberglass to insulate my HUGE
>crawl space and it will have and R10 value opposed to the R13 value of the
>fiberglass. I first asked the question what does the "R" mean then I asked
>is polystyrene (styrofoam) just as good as fiberglass to help keep in
>heat. Could someone simply say yes or no. Is polystyrene good, safe and
>effective to use for insulating a HUGE crawl space?
R13 is much more efficient than R10.
What is confusing about that?
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