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Poll: Would you use Foil Backed OSB on your new Roof?
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Would you use Foil Backed OSB on your new Roof?

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Old 05-04-2007, 08:15 AM   #16
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Foil Backed OSB


No that is not overly cynical, just reality.

Ed

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Old 06-27-2008, 03:45 PM   #17
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AaronB OK, here are my thoughts on foil backed products marketed as radiant barriers....

Its B.S. Foil facing can only reflect heat before it becomes heat. It can only reflect light. After the sun's light has made contact with your roof, the light energy is changed to heat energy. The foil can certainly absorb and radiate heat, but it cannot reflect that heat unless it is on the very outside, exposed to the UV light.
Foil reflects heat and radio energy NOT ONLY light energy. Aaron, you might talk to NASA to see if foil works on their spacecraft. The amount of heat the foil "absorbs" is minute due to the thinness of the material making the foil a poor "radiator" of heat. I guess you should avoid using Reynold's Wrap 'cause it's only made to reflect light. And it's not "the UV light"... Heat is on the Infrared end of the spectrum. Hummmm, maybe that's why my suntan lotion doesn't keep me cool.

See this department of energy website:

http://www.ornl.gov/sci/roofs+walls/radiant/index.html

It's from the guys at the Oak Ridge National Laboratory. Not exactly Aaron's 6th grade science class?

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I do not....it was learned in 6th grade science class. Metals absorb and conduct heat. No mfg rep has ever been able to explain it otherwise.
You've got crappy reps. LP and GP bought up the little companies that made the original "KoolPly". I guess they just needed a place to toss some bucks. After reading your logic Aaron, I think you're in the correct business... thank god you're not in the radiant heat flooring business or you'd have your clients wearing metal shoes to keep their feet warm.

Oak Ridge studies show savings up to 17% on utilities and negligible heat gain into the roofing materials (1-2%. That's probably less than the difference between various shingle colors). The foil blocks RADIANT HEAT. I built a 3400 Sq Ft house in Dallas Texas and saved hundreds of dollars in air conditioning bills versus my neighbors with similar houses and no radiant barrier.

In the winter the foil helps keep heat radiating OUT through the roof. Remember that casserole with foil on top?

So I would heartily endorse the foil product. It's roofers like Aaron et al that have helped keep America's energy foot print so large. Ed, the jury is not "still out". The product is proven and will pay for itself in 3-5 years.

I don't work in the roofin' bidness but if I did I would put a foil backed product on every roof I did. OSB vs plywood? Sure. Use which ever you want... you can even staple many radiant barrier products to the sheathing yourself.

As far as roofing warranties, I live in Texas where a roof gets pounded by hail approximately every 7 years, so any shingle warranty is just something to help you get to sleep every night... much like the worthless home warranties that builders sell to clients... now those are a joke...
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Old 06-28-2008, 11:18 PM   #18
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the foil has always been hot enough to mely vinyl siding,as such,I would expect the existing plywood to dry out,and delaminate much earlier than normal
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Old 06-30-2008, 01:39 PM   #19
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the foil has always been hot enough to mely vinyl siding,as such,I would expect the existing plywood to dry out,and delaminate much earlier than normal
didn't think of that
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Old 06-30-2008, 06:45 PM   #20
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I would be very interested to see what WildHorses has to say in thay regard.

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Old 07-07-2008, 01:34 AM   #21
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The foil backed OSB or Plywood are effective in climates where you run your AC a lot in the summer. If you are in a moderate climate it is not worth the cost.
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Old 08-31-2011, 01:19 PM   #22
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Foil Backed OSB


Quote:
Originally Posted by AaronB View Post
OK, here are my thoughts on foil backed products marketed as radiant barriers....

Its B.S. Foil facing can only reflect heat before it becomes heat. It can only reflect light. After the sun's light has made contact with your roof, the light energy is changed to heat energy. The foil can certainly absorb and radiate heat, but it cannot reflect that heat unless it is on the very outside, exposed to the UV light.
Maybe, AaronB, continuing you education past primary school would have kept you off of roofs. I'd like to know which law of Thermodynamics you're referring too. <link removed>

Last edited by kwikfishron; 07-28-2013 at 09:37 AM.
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Old 07-24-2013, 12:32 PM   #23
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OK, here are my thoughts on foil backed products marketed as radiant barriers....

Its B.S. Foil facing can only reflect heat before it becomes heat. It can only reflect light. After the sun's light has made contact with your roof, the light energy is changed to heat energy. The foil can certainly absorb and radiate heat, but it cannot reflect that heat unless it is on the very outside, exposed to the UV light.
Sounds to me like you have never used this product. I recently built two identical restroom buildings, about 1/2 apart, and neither had ANY shade what so ever around them. the first building I built, I used Regular 7/16'' plywood decking, Titanium UDL underlayment, and 40 year shingles. The second building I built, had the same exact exposier to the sun, only I used foil backed 7/16'' plywood on this building. The building with the foil back plywood was right at 30 degrees COOLER, than the other building! Both building temp readings were done about 5-10 minutes apart, at the same time of day. Bottom line.....It Works~!
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Old 07-28-2013, 09:28 AM   #24
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and ,So the question of whether or not,,the plywood would bake itself to delaminate,and turns to dust in much faster time,like fire treated plywood,,isn`t a thought,,seems that it would be a natural occurrence with the radiant heat repelled back at the decking,,,so what about it?

just saying the fire treated plywood is a large safety issue today,as a result of very similar circumstance
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Old 07-28-2013, 08:31 PM   #25
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havent seen you around in forever man!
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Old 07-28-2013, 11:13 PM   #26
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http://www.greenbuildingadvisor.com/...search-problem
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Old 08-27-2013, 01:46 PM   #27
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On new construction, bang for the buck you can't beat spending the LITTLE extra money for radiant barrier decking. It's only a couple bucks per sheet more and worth it since there is no additional labor. Radiant barrier decking works off the emissivity quality of aluminum which is the ability NOT to easily convert energy into radiant heat (think of a foil wrapped potato will stay hot longer a potato not wrapped with foil). As for increasing the roof temperature? I've measured many roofs and typically the roof/shingle temperature increases less than 10 degrees over a radiant barrier. I don't think there is going to be a significant difference in the life of the shingles or deck whether the max temperature is 160 or 170. Here in Texas many areas are actually requiring radiant barriers on new construction.

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