Using Radiant Barrier Between Roof ...: "I am wondering about installing radiant barrier between the roof ..." - Guest User (6/12/2007) | Insulation Concerns | Archive

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I am wondering about installing radiant barrier between the roof decking and the shingles on my roof. Will this usage negate the benefit of using radiant barrier? What are the downside of using the radiant barrier in this manner? Note: I see companies offering to apply a radiant barriere spray to the underside of roof deckings. Is this much different from the manner that I am suggesting? Thank you.	Guest User 6/12/2007	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/9681/find/
A radiant barrier is not effective when it is sandwiched between other materials. It must face an airspace (either way) in order to be effective.	Todd Miller Isaiah Industries, Inc. 6/15/2007	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/9682/find/
Would strapping over the radiant barrier create the necessary air space?	Guest User 6/16/2007	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/9683/find/
yes	Todd Miller Isaiah Industries, Inc. 6/16/2007	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/9684/find/
How much of an air space is needed? Would a radiant barrier on the underside of the roof deck above a vaulted ceiling (i.e no attic) be effective?	Guest User 5/26/2008	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/9685/find/
Generally I would say a minimum 1" airspace.	Todd Miller Isaiah Industries, Inc. 5/29/2008	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/9686/find/
i'm planning on roofing a new house with metal roofing. is radiant heat barrier sheathing benificial, nesesary or even compatible with metal roofing?	Guest User 6/4/2008	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/9687/find/
It can be used and probably is helpful. However, I would also use a metal roof with reflective pigment paint and / or some sort of airgap between the back of the metal and the roof deck.	Todd Miller Isaiah Industries, Inc. 6/5/2008	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/9688/find/
Would MYLAR make a good radiant barriar, in your opinion?	Guest User 6/5/2008	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/9689/find/
Probably but I do not know for certain	Todd Miller Isaiah Industries, Inc. 6/5/2008	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/9690/find/
Mylar would not act as a a radiant barrier unless it had an aluminum film facing.	Guest User 8/24/2008	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/9691/find/
Thanks.	Todd Miller Isaiah Industries, Inc. 8/26/2008	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/9692/find/
I am considering the application of radiant barrier to the outside of existing siding (in between the primer coat and two coats of exterior paint. Will this application be effective? Thanks!	Guest User 4/1/2010	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/9693/find/
I was under the impression that radiant barriers need an airspace to be effective as well. You would be better off with a layer of rigid foam in most cases.	Eric Novotny An informed customer is the Best Customer! 4/1/2010	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/9694/find/

Using Radiant Barrier Between Roof Decking and Shingles