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R-Value of Foil Bubble Wrap?

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R-Value of Foil Bubble Wrap? TomD 09-18-2007
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Posted by TomD on September 18, 2007, 9:42 am
what is the value of foil bubble wrap?. AC installer wants to use it.
is it any good? if not what should i use? Duct work is in the attic
with fairly long runs, over 40ft. I am in the NY / NJ area.

Posted by Lloyd E. Sponenburgh on September 18, 2007, 10:43 am

> what is the value of foil bubble wrap?. AC installer wants to use it.
> is it any good? if not what should i use? Duct work is in the attic
> with fairly long runs, over 40ft. I am in the NY / NJ area.

Bubble-wrap style radiant barrier varies in R value depending upon its
use and its environment.

It's specifically designed to block radiant energy in the visible and
infrared spectra. At that task, good quality material can be around 97%
effective, and can show an "effective R" of up around 19. (It must block
97% to qualify for the name "radiant barrier material")

However, it degrades in performance if exposed to ultraviolet for long.
Its polyethylene overcoating becomes cloudy, and begins to absorb radiant
heat, rather than reflect it.

It's a poor insulator for the purpose of acting as a barrier between
different air temperatures, dropping down to an R-2 value in that
service.

LLoyd


Posted by on September 18, 2007, 11:05 am
On Tue, 18 Sep 2007 14:43:01 -0000, "Lloyd E. Sponenburgh"
<lloydspinsidemindspring.com> wrote:

>
>> what is the value of foil bubble wrap?. AC installer wants to use it.
>> is it any good? if not what should i use? Duct work is in the attic
>> with fairly long runs, over 40ft. I am in the NY / NJ area.
>
>Bubble-wrap style radiant barrier varies in R value depending upon its
>use and its environment.

        Utter and complete bullshit.

        A given piece of insulating material has a given R value,
period. Moving it from place A to place B dos not change that.


--
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Paul ( pjm @ pobox . com ) - remove spaces to email me
'Some days, it's just not worth chewing through the restraints.'
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Posted by Lloyd E. Sponenburgh on September 18, 2007, 12:37 pm
.p.jm@see_my_sig_for_address.com fired this volley in
> Utter and complete bullshit.
>
> A given piece of insulating material has a given R value,
> period. Moving it from place A to place B dos not change that.
>

Indeed, your statement is utter and complete bullshit. Read up on radiant
barrier materials, fool.

LLoyd

Posted by geothermaljones on September 18, 2007, 5:17 pm
6" Batt underwater???



> On Tue, 18 Sep 2007 14:43:01 -0000, "Lloyd E. Sponenburgh"
> <lloydspinsidemindspring.com> wrote:
>
> >
> >> what is the value of foil bubble wrap?. AC installer wants to use it.
> >> is it any good? if not what should i use? Duct work is in the attic
> >> with fairly long runs, over 40ft. I am in the NY / NJ area.
> >
> >Bubble-wrap style radiant barrier varies in R value depending upon its
> >use and its environment.
>
> Utter and complete bullshit.
>
> A given piece of insulating material has a given R value,
> period. Moving it from place A to place B dos not change that.
>
>
> --
> Click here every day to feed an animal that needs you today !!!
> http://www.theanimalrescuesite.com/
>
> Paul ( pjm @ pobox . com ) - remove spaces to email me
> 'Some days, it's just not worth chewing through the restraints.'
> 'With sufficient thrust, pigs fly just fine.'
> HVAC/R program for Palm PDA's
> Free demo now available online http://pmilligan.net/palm/



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