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Posted by zek on February 5, 2007, 12:02 pm
What does this insulation serve? I see some at The Home Depot.
Regulation? Heat reflection? Some fire protection? or all of those
reasons?? I want to put some on the basement walls over cinder block,
foil out.
g
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Posted by Lawrence on February 5, 2007, 12:47 pm
> What does this insulation serve? I see some at The Home Depot.
> Regulation? Heat reflection? Some fire protection? or all of those
> reasons?? I want to put some on the basement walls over cinder block,
> foil out.
>
The foil backed insulation is a superior product and gives you more
insulation (R-value) both per dollar and per inch by my calculation
than other similar products. The foil itself not only has insulation
value but also acts as a reflective vapor barrier.
If you use two layers of foam board they can be staggered so that the
barrier is continuous. I like it also because it is less likely to be
damaged when transporting or installing compared to regualar foam
board.
It seems more expensive at first but when you consider performance you
come out ahead. The only reason to use unfaced foam board is if you
really need a lot of total R value like a roof. It comes in larger
thicknesses and so a given R can be acheived with fewer sheets.
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Posted by LayPerson Tom on February 5, 2007, 1:33 pm
>What does this insulation serve? I see some at The Home Depot.
>Regulation? Heat reflection? Some fire protection? or all of those
>reasons?? I want to put some on the basement walls over cinder block,
>foil out.
>
>g
I don't think the foil is thick enough to count as fire protection.
This is my guess, one it is reflective of heat, and two, it keeps the
foil together from small bumps and scratches.
Just a guess......
tom @ www.FindMeShelter.com
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Posted by Joseph Meehan on February 5, 2007, 2:44 pm
zek wrote:
> What does this insulation serve? I see some at The Home Depot.
> Regulation? Heat reflection? Some fire protection? or all of those
> reasons?? I want to put some on the basement walls over cinder block,
> foil out.
>
> g
The foil offers 0 fire protection and insulation, but it does offer some
heat radiation resistance and it is a vapor barrier.
--
Joseph Meehan
Dia 's Muire duit
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Posted by on February 5, 2007, 3:25 pm
> The foil offers 0 fire protection and insulation...
Au contraire, it offers some real (vs code :-) fire protection, and
the ASHRAE HOF says it adds a real US R2.55 when installed vertically
with horizontal heatflow and a 3.5" air gap (exposed toward the room)
and a 50 F mean temp and a 30 F differential, eg 65 F room air and
a 35 F basement wall.
Nick
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