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Old 05-09-2014, 07:16 AM   #1
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Radiant barrier (should I)


I came across this item. . it covers the attic ceiling. Doesn't that prevent air from getting to the ceiling of the attic and not allow it to breath therefore promoting mold??

[ame]http://www.youtube.com/watch?v=E_9jQsfdjZ0[/ame]
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or this.
[ame]http://www.youtube.com/watch?v=iw18CWMYnAs[/ame]


Last edited by simagic; 05-09-2014 at 07:28 AM.
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Old 05-09-2014, 11:40 AM   #2
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Where is the home?

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Old 05-09-2014, 11:43 AM   #3
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Radiant barrier (should I)


PHILADELPHIA pa
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Old 05-09-2014, 11:49 AM   #4
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No application value in Philly to be honest.

Wouldn't waste my money on it.

Spend that money on Air Sealing and insulation.
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Old 05-09-2014, 01:42 PM   #5
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+1. Not a mold issue, but it is a waste of money in your location.
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Old 06-05-2014, 07:38 AM   #6
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Radiant barrier (should I)


From what standpoint is it a waste in PA? Does it not get hot in PA? Isn't any amount of reduction in attic temp a positive for any home? It may not benefit as much as a home in TX, but it will still help.
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Old 06-06-2014, 06:24 AM   #7
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Spend the money on the attic floor and insulation levels.

In PA, some radiant heat gain in the winter is a benefit.

The TVA did a study on it years ago and found it to be inconsequential in terms of performance after an insulation level of about R-19.

Will it keep the attic cooler, sure. If you have duct work up there, it might help to that small extent but I would rather see money spent on sealing the duct work against leaks rather than tin foil on the rafters.
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Old 07-02-2014, 05:25 PM   #8
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Many people have benefited from the use of a radiant barrier in cooler climates. If you use a breathable version, you don't have to worry about creating any moisture issues.
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Old 07-03-2014, 04:43 AM   #9
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An excerpt from the TVA report.

The results showed that all RB configurations significantly reduced heat gain through the ceiling during the summer. Reductions in heat gain during daylight and peak electric load hours were especially attractive. Roof temperatures for the RB configurations were only slightly higher than for the non-RB case.

Link to the report. https://repository.tamu.edu/bitstrea...pdf?sequence=3


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Old 07-03-2014, 06:29 AM   #10
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Quote:
Originally Posted by Kensie View Post
Many people have benefited from the use of a radiant barrier in cooler climates. If you use a breathable version, you don't have to worry about creating any moisture issues.
Data to back this up?
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Old 07-03-2014, 06:31 AM   #11
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Quote:
Originally Posted by beenthere View Post
An excerpt from the TVA report.

The results showed that all RB configurations significantly reduced heat gain through the ceiling during the summer. Reductions in heat gain during daylight and peak electric load hours were especially attractive. Roof temperatures for the RB configurations were only slightly higher than for the non-RB case.

Link to the report. https://repository.tamu.edu/bitstrea...pdf?sequence=3


beenthere,

I agree that there are applications where it helps. That being said, the OP would probably save 3X as much money by spending the money on air sealing and insulating the attic floor.

If there is no ductwork in the attic, the savings will be even less.
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Old 07-03-2014, 10:35 AM   #12
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+1... Sounds like we have some radiant barrier salesmen here, or somebody that has fallen victim to one. If the attic is properly air-sealed and insulated the effectiveness will be negligible on the conditioned space.
Whether or not it has any benefit at all can be debated, but ROI cannot. It's not a good investment.
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Old 07-03-2014, 04:30 PM   #13
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Quote:
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beenthere,

I agree that there are applications where it helps. That being said, the OP would probably save 3X as much money by spending the money on air sealing and insulating the attic floor.

If there is no ductwork in the attic, the savings will be even less.
Op might be able to save 3X as much by sealing and adding insulation. Or only half as much, since we don't know how well sealed his house is or isn't.

RB still lowers the attic temp tremendously, which lowers the attic temp, helping to increase the effect of the insulation on the attic floor.

I go into a lot of very hot attics here in PA.
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Old 07-05-2014, 08:47 PM   #14
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My son had his roof redone last month. Tech shield added and we are in Texas. 2 weeks later he had all of the old insulation, a small amount of old blown in and 3 inch, removed. I had figured with the change in weather here he would be complaining, but he has not and his ac is handling it well.

Highly recommend the use of it!
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Old 07-07-2014, 11:03 AM   #15
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Not many people know this....a Polar bears fur is only two inches thick.
Yet with a body temperature of 37C (much like us) it is happy to play in outside temperatures of minus 20C.
Why? Because not only does its fur act as insulation it also acts as a radiant barrier, reflecting the bears heat back into its body.

The motto, radiant systems can reflect heat back into the home, or reflect heat from the sun. Or even do both!

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