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R-Value of Foil Bubble Wrap?

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Subject Author Date
R-Value of Foil Bubble Wrap? TomD 09-18-2007
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Posted by Abby Normal on September 19, 2007, 8:01 am
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.
>
> Here's a quasi-related study report performed in Canada.
>
> I wouldn't use it as a first choice for anything. YMMV.
>
> http://www.cmhc-schl.gc.ca/odpub/pdf/63728.pdf
>
> -zero

Its a product that is better suited for keeping heat out than in.
Under slab is a poor application for it. Following the underside of a
roof deck with an air space is a better application.


Posted by -zero on September 20, 2007, 1:10 am

> 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.
>>
>> Here's a quasi-related study report performed in Canada.
>>
>> I wouldn't use it as a first choice for anything. YMMV.
>>
>> http://www.cmhc-schl.gc.ca/odpub/pdf/63728.pdf
>>
>> -zero
>
> Its a product that is better suited for keeping heat out than in.
> Under slab is a poor application for it. Following the underside of a
> roof deck with an air space is a better application.

Yea, I can see that working. I went back to Google and found a few web
sites
pimping their version of the product. Like you say, under a roof deck,
or stapled across exposed roof rafters, reflecting the radiant of a
merciless
Florida sunny day.
I recall the times I neglected to throw up my
foil-like windshield sun visor for the duration of a sunny day... and YES,
it
works VERY well for that application. I TRY not to let that happen
very often, though. :o)

-zero



Posted by Bob Pietrangelo on September 19, 2007, 7:06 pm
Thje bubble wrap has an insulating factor of R-6 if I remeber correctly.
BUT---it has to be installed properly. Most guys just wrap it around the
duct. You have to properly install spacers between the duct and the
insulation. If you don't it aint worth shit. If they are going to use it
watch them, if not make them use an R-8 blanket insulation.

--
Bob Pietrangelo
bobp3@comcast.net (home)
bob@comfort-solution.biz (work)
www.comfort-solution.biz





> 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 Bob Pietrangelo on September 19, 2007, 7:11 pm
17 friggin posts and not one is relevent, lloydy boi is discussing rooftop
insulation, when the op stated it was in an attic, everyone else is trying
to beat up on one or the other, jeez

--
Bob Pietrangelo
bobp3@comcast.net (home)
bob@comfort-solution.biz (work)
www.comfort-solution.biz





> 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 20, 2007, 7:26 am

> 17 friggin posts and not one is relevent, lloydy boi is discussing
> rooftop insulation, when the op stated it was in an attic, everyone
> else is trying to beat up on one or the other, jeez
>

Not, really Bob. ONE issue was radiant barrier on ducting, and where it is
best placed -- which is as part of the roof structure, rather than on the
ducts themselves.

LLoyd

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