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Posted by m Ransley on July 13, 2006, 8:57 am
Wake up senile nick, R value is R value, a standardised measurement used
to measure insulations effectiveness, resistance to heat flow. Polyiso
foilfaced, Both Sides is R 7.2" new, 6.8R" stabilised. Your mythical
dreamworld of R 6 added with 2 sheets of foil does not exist anywhere in
reality or at any store on this planet, or it would be sold as R 12.8*
polyiso, and it is not.
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Posted by Robert Gammon on July 13, 2006, 9:32 am
m Ransley wrote:
> Wake up senile nick, R value is R value, a standardised measurement used
> to measure insulations effectiveness, resistance to heat flow. Polyiso
> foilfaced, Both Sides is R 7.2" new, 6.8R" stabilised. Your mythical
> dreamworld of R 6 added with 2 sheets of foil does not exist anywhere in
> reality or at any store on this planet, or it would be sold as R 12.8*
> polyiso, and it is not.
>
>
Senile is not the word.
Nick appears to believe that he is a reincarnation of a mythical
all-knowing, all-powerful being. His attitude towards others reinforces
this idea with almost everything he posts.
patent holders are idiots.
Facts are false.
Everyone else besides Nick are absolute morons is the message he conveys
Aluminum foil is tested for 'emissivity' not R value. That is the test
is to see how good a RADIATOR it is not how good and INSULATOR it is.
If it is used for cookware and electric power distribution, it CAN'T be
an insulator of heat or electricity.
Aluminum is therefore a RADIANT barrier, and may also act as a vapor
retarder, but it does NOT improve an INSULATION material's ability to
restrict the movement of heat, EXCEPT by REFLECTING the heat - but it
RADIATES to BOTH sides of the foil.
An AIRSPACE MUST be incorporated in order for the foil to be effective
and the literature that Nick quotes indicates this as well.
So Foil helps, BUT only when there is a air gap. Foil faced insulation
is more effective than non foil faced insulation only when there is an
air gap for the foil to radiate heat into. Even then, if there is no
circulation of that air, we get a heat buildup between the foil and the
outside sheathing that could take most of the night to dissipate.
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Posted by on July 13, 2006, 12:33 pm
>Aluminum foil is tested for 'emissivity' not R value...
Some of us can calculate the R-value based on the emissivity :-)
>... it CAN'T be an insulator of heat...
Wrong.
>Aluminum is therefore a RADIANT barrier, and may also act as a vapor
>retarder, but it does NOT improve an INSULATION material's ability to
>restrict the movement of heat...
Wrong.
>... Foil helps, BUT only when there is a air gap.
Right :-)
Nick
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Posted by on July 13, 2006, 12:29 pm
>... R6 added with 2 sheets of foil does not exist anywhere in
>reality or at any store on this planet, or it would be sold as
>R 12.8* polyiso
It can work that way in the real world, but it's illegal to advertise R12.8,
according to US federal regs, because the R-value depends on the installation
conditions, which is confusing to the general public. Altho we can measure and
calculate and advertise the "system R-value," if we have the merest grasp of
physics :-)
Nick
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Posted by Edwin Pawlowski on July 12, 2006, 7:33 pm
> Same thing. All R5 per inch. Open cell expanded polystyrene
> (white coffee cup material) is R4 per inch...
That would be closed cell.
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Page 6 of 7 < 1 2 3 > last >>
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