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"R" for insulation????

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"R" for insulation???? cece e. 07-11-2006
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Posted by cece e. on July 11, 2006, 11:26 pm
My last question before I get started with insulating my crawl space.
Remember this is my first time doing this. What does the "R" mean for
insulation. I was going to insulated my crawl space with fiberglass
insulation but a man from the big orange box told me that for a crawl
space I could use (i forgot the exact name) styrofoam and glue it to the
walls and it would have an R10 rating (or something like that). What did
he mean and is styrofoam just as effective as insulation (in Colorado) for
keeping the heat in?

Posted by Edwin Pawlowski on July 11, 2006, 11:30 pm

> My last question before I get started with insulating my crawl space.
> Remember this is my first time doing this. What does the "R" mean for
> insulation. I was going to insulated my crawl space with fiberglass
> insulation but a man from the big orange box told me that for a crawl
> space I could use (i forgot the exact name) styrofoam and glue it to the
> walls and it would have an R10 rating (or something like that). What did
> he mean and is styrofoam just as effective as insulation (in Colorado) for
> keeping the heat in?

R is for resistance to heat movement. Some info here
http://www.rvalue.net/

Styrofoam is about R4 per inch, same with expandable polystyrene.



Posted by on July 12, 2006, 1:53 am

> My last question before I get started with insulating my crawl space...
> What does the "R" mean for insulation.

Resistance to heat flow. Specifically, Ohm's law for heatflow says I = E/R
Btu/h, where E is an F temp diff and R is the R-value of 1 square foot of
insulation. For A square feet, multiply the heatflow by A.

For instance, a 2'x8' R5 Styrofoam (vs R4 beadboard) wall that's 70 F on
one side and 30 F on the other will have I = (70F-30F)2'x8'/R5 = 128 Btu/h
of heat (38 watts) flowing through it.

Nick


Posted by on July 12, 2006, 3:09 am
wrote:

>
>> My last question before I get started with insulating my crawl space.
>> Remember this is my first time doing this. What does the "R" mean for
>> insulation. I was going to insulated my crawl space with fiberglass
>> insulation but a man from the big orange box told me that for a crawl
>> space I could use (i forgot the exact name) styrofoam and glue it to the
>> walls and it would have an R10 rating (or something like that). What did
>> he mean and is styrofoam just as effective as insulation (in Colorado) for
>> keeping the heat in?
>
>R is for resistance to heat movement. Some info here
>http://www.rvalue.net/
>
>Styrofoam is about R4 per inch, same with expandable polystyrene.
>

And here I always thought it meant "Rob". The higher the R value the
more money they ROB from your wallet. :)

Posted by m Ransley on July 12, 2006, 7:13 am
Styrofoam is R4-4.5" Blue or pink foamboard is R5" Foil faced
Polyisocyanurate foamboard is R7.2" R value is resistance to heat flow,
foam costs more, in certain areas it is better where area to insulate is
minimal, it also provides a vapor -air infiltration barrier.


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