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Old 09-23-2010, 01:16 AM   #31
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Suggestions for attic cooling


And that’s not all the chips trap: “A radiant barrier installed on top of attic floor insulation is more susceptible to dust accumulation. This undesirable installation method may also trap moisture in fiber insulation during cold weather. A radiant barrier installed on the cold side of the insulation acts as a vapor barrier in the wrong location. When warm moisture carrying house air leaks into the attic in the winter, it may condense on the underside of the barrier. Even a perforated radiant barrier can trap moisture in cold climates since the water can freeze in the small holes and seal them. Because of these hazards, it's strongly recommended that you NOT apply radiant barriers directly on top of the attic floor insulation. Of course, installing them at all in a cold climate is not generally cost effective anyway.” From: http://www.energysavers.gov/your_hom.../mytopic=11680

Also: http://www.energysavers.gov/your_hom.../mytopic=11680

They also trap dust: “When the radiant barrier is placed on the attic floor, dust does become a problem. As dust builds up, insulating value is reduced by as much as half, over a period of one to ten years.” From: http://www.homeenergy.org/archive/he...92/920704.html

If you have gas units, be careful: http://www.advancedenergy.org/buildi...%20Studies.pdf

Your attic fan could pull conditioned air from the living space below unless you air sealed first: http://www.rd.com/how-to-seal-attic-...icle18158.html

It will also short circuit any gable or ridge vents, negating the soffits as intakes.

Gary

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Old 09-23-2010, 04:44 PM   #32
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Suggestions for attic cooling


A radiant barrier should not be in contact with the floor insulation. It will lose its effectiveness as dust collects or if in contact with virtually any othre surface, that's why it's recommended to be installed on or between the roof joists and on all vertical / gable ends.

If installing on your bottom insulation, your attic will still heat up because it's allowing the sun's radiant energy to penertrate into the attic space.
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Old 09-23-2010, 05:57 PM   #33
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This seems typical of most salesmen: don't listen, just run your spiel. The original poster (almost two months old, usually means resurrected by a product ad) lives in Maryland, where a radiant barrier would not be positive, but negative: http://www.inspectapedia.com/Energy/...t_Barriers.htm

Read my last post again, slowly- notice the word “chips”?

Read post #28 again- or first time………

I know where radiant works, NOT always with gains as you said: “You will save using a radiant barrier, no question.” I feel sad that you believe this lie enough to tell it to others. Tell them the other side of the story, you can reap negative numbers.

Some areas will lose money installing it rather than more insulation in a colder climate. Your pitch is almost as bad as fiberglass insulation’s. (I've heard some save over 50%)

Gary
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Old 09-23-2010, 06:31 PM   #34
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Thanks for the kind words Gary, but I don't sell. You really haven't done your research on this topic, and it's clear. Radiant barrier will work in virtually any climate and obviously in the hot climates your payback period is much shorter than in the cold climates. Radiant barriers work both ways: keep hot out in the summer and retain heat in the winter. Like I said, choose proper insulation in the cold climates first. Regardless, live green.
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Old 09-25-2010, 11:05 PM   #35
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I did some more research.

I knew that radiant barriers work best in warmer climate areas, reducing the cooling load and don’t affect the heating load, other than negating it. In the winter, you need the heating effect of the sun in the attic, not block it.
So if one has minimal insulation with more heating days than cooling (using the AC), it is more cost effective to add more insulation than a radiant barrier.

“Radiant barriers are more effective in hot climates than in cool climates. Some studies
show that radiant barriers can lower cooling costs between 5%–10% when used in a
warm, sunny climate. The reduced heat gain may even allow for a smaller air conditioning system. But in cool climates, it's usually more cost effective to install more than the minimum recommended level of insulation rather than a radiant barrier.”--- http://docs.google.com/viewer?a=v&q=...EezxxzJ6a8AaeA

“The best application of radiant barriers is when the house is in a climate which needs cooling and has either the air conditioner or ducts in an unconditioned attic.” --- The sheets are a plus here but not the chips or the paint: http://www.recurve.com/your-home/bui...diant-barrier/

” Our survey simply shows how the two systems performed compared to one another. This comparison also makes it obvious that, even in Louisiana’s mild climate, some type of insulation is needed.” http://www.healthyheating.com/Page%2...onstration.pdf
That is the fifth one down from here: http://www.healthyheating.com/Page%2...o_bldg_sys.htm

Gary

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