Comments for

Comment on Foil Insulation or Foil Bubble Insulation by ideas

ideas — Mon, 18 Apr 2011 19:25:34 +0000

There is no voiding of warranty that I have ever heard. i saw a test report once that showed how it can heat up the shingles by up to 8 degrees compared to a non-barriered roof. this is well within any shingle tolerance that it is not going to void any shingle warranty. I measured my old house and the shingles were hitting 168 degrees BEFORE the barrier. I never saw it go beyond 170 after the barrier, so I don’t know if it was because the sun was hotter on that day, or if it was the radiant barrier. Either way, the shingles were fine.

Comment on Foil Insulation or Foil Bubble Insulation by Jay

Jay — Mon, 18 Apr 2011 19:01:46 +0000

Some claim that stapling radiant barrier foil on to the roof rafters will heat up the roof shingles and void their warranty. Is it true?

Comment on Insulation Before or After Radiant Barrier? by ideas

ideas — Thu, 03 Mar 2011 16:50:38 +0000

Thanks Timothy,

I was always told 2″ air space by the manufacturers, though. I haven’t tested it myself since I staple it to the rafters and the rafters always have at least a 2″ gap already.

Comment on Insulation Before or After Radiant Barrier? by Kenny

Kenny — Sun, 20 Feb 2011 16:02:28 +0000

I believe stapling the radiant barrier to the rafters and adding insulation will give you the besr result. This will give the barrier room to work for what it is designed.

Comment on Spray in foam is not a radiant barrier by ideas

ideas — Thu, 18 Feb 2010 14:38:52 +0000

Absolutely! Knowing what product to use and when and where to use it is HUGE. I’m a proponent of getting the best bang for the buck. There are so many products out there that it really pays to educate yourself.

Comment on Spray in foam is not a radiant barrier by Radiant Barrier

Radiant Barrier — Thu, 18 Feb 2010 07:40:54 +0000

I agree and like the way you spoke about different insulation products. As the insulation industry and weatherization techniques have evolved, multiple products are being used depending on the various applications. Not one product is correct for everything as we used to do.

Comment on Equipment Needed To Install Radiant Barrier by ideas

ideas — Tue, 06 Oct 2009 15:58:55 +0000

Thank you for the compliment,

Finding calculations was the first hurdle I had when trying to learn about radiant barriers. Granted, I was experimenting, so having more than I needed wasn’t a problem for me. For someone who only wanted to do their own house and not end up with a bunch of extra foil, having the right square footage is definitely helpful.

Comment on Equipment Needed To Install Radiant Barrier by Radiant Barrier

Radiant Barrier — Tue, 06 Oct 2009 06:42:50 +0000

My compliments on a solid article. Many helpful key points are covered. Nothing is more frustrating than working with flimsy material in a crampled attic space. And yes, perforated products for attic applications is usually the way to go.

Here’s some quick formulas to help measure square footage while accounting for pitch in pitch roof designs.

Length X Width X 1.4 for 12×4 roof
Length X Width X 1.6 for 12×6 roof
Length X Width X 1.8 for 12×8 roof

Comment on Insulation Before or After Radiant Barrier? by Timothy

Timothy — Mon, 13 Jul 2009 14:50:30 +0000

Actually, a radiant barrier needs at least a 3/4″ air space so it needs to go down over the top of insulation on the attic floor (so after you add more insulation). OR, you can staple it to the underside of the rafters first and then add more insulation to the attic floor. Either way, the radiant barriers must be facing at least one air space of at least 3/4″.