Kurt Shafer
  • Temecula, CA
  • United States
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Where can I find the best radiant barrier to install under my roof?
14 Replies

As home energy professionals, we all need to know the best way to prevent attics from overheating in the summer. My 2800 SF 2 story has a standard man made 1 inch thick shingle roof over simple sub…Continue

Tags: barrier, radiant, roof

Started this discussion. Last reply by Ed Minch 13 hours ago.

 

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Ed Minch replied to Kurt Shafer's discussion Where can I find the best radiant barrier to install under my roof?
"The important thing here is the surface temperature of the ceiling against the attic as compared to the interior temperature of the house as this is where the money goes.  The OP does not state what the air temp is when he has a 90° ceiling…"
13 hours ago
Kurt Shafer replied to Kurt Shafer's discussion Where can I find the best radiant barrier to install under my roof?
"Tom, I would like to see that article. Where is it? And what kind of radiant barrier could cost so much and do so little?I am installing what I think will be the perfect solution for my 2800 sf 2 story. First a ridge vent on the 45 foot long clean…"
yesterday
Hal Skinner replied to Kurt Shafer's discussion Where can I find the best radiant barrier to install under my roof?
""On a RESNET discussion some insulation experts agreed that insulation will not prevent hot attic air from heating ceilings."  I suspect there is more to that discussion as that statement isn't entirely correct.  Most…"
yesterday
Tom DelConte replied to Kurt Shafer's discussion Where can I find the best radiant barrier to install under my roof?
"Green Building Advisors primary article on the above topic by Martin Holladay proves that radiant barriers are too expensive, with an average payback of 59 years. Seek other solutions!"
Tuesday
Hal Skinner replied to Kurt Shafer's discussion Where can I find the best radiant barrier to install under my roof?
"I just posted a statement and pictures of a home in Yuma AZ.  This is one I did 10 years ago.  I just spoke to the owner.  The biggest electric bill he has seen is $160.00 on a 110 to 120 degree month.  His bills average $70.00…"
Saturday
Tom Mallard replied to Kurt Shafer's discussion Where can I find the best radiant barrier to install under my roof?
"Anything done to raise the roofing off the sheathing works to reduce the high temperatures in the attic above ambient but has limits.So, to deal with bad situations like my attic being 160F daily in Phoenix a lot of summer requires reducing…"
Saturday
Kurt Shafer's discussion was featured

Where can I find the best radiant barrier to install under my roof?

As home energy professionals, we all need to know the best way to prevent attics from overheating in the summer. My 2800 SF 2 story has a standard man made 1 inch thick shingle roof over simple sub roof and an attic just high enough to stand under the peak. The attic has gable vents at the ends and 3 inch holes drilled in threes in the soffits every 6 feet or so. Over the space of a hot day my ceilings get to over 90 degrees and heat my rooms. On a RESNET discussion some insulation experts…See More
Sep 8
Kurt Shafer posted a status
"never did get real data on the best RCC"
Sep 5
Hal Skinner replied to Kurt Shafer's discussion Where can I find the best radiant barrier to install under my roof?
""It is the other way around for the ducts in the attic. When the ac is running they actually cool the attic at a cost". Heat energy travels towards cold.  Cold does not travel, only heat energy.  If I may here;  When the AC…"
Sep 3
Bud Poll replied to Kurt Shafer's discussion Where can I find the best radiant barrier to install under my roof?
"It is the other way around for the ducts in the attic. When the ac is running they actually cool the attic at a cost. Of course any heat that finds its way into the house will always end up at that ceiling. But there is another effect that…"
Sep 3
Kurt Shafer replied to Kurt Shafer's discussion Where can I find the best radiant barrier to install under my roof?
"Bud,  One of the many things I like about these forums is that I always learn something I did not know.  I am working to wrap my mind around insulation and heat flow in my home.  Your calculation "limit the surface temperature…"
Sep 3
Bud Poll replied to Kurt Shafer's discussion Where can I find the best radiant barrier to install under my roof?
"LOL, I have a one track mind and every once in awhile it jumps the track.  The 90° makes more sense now.  "I was not discussing heat flow."  Heat flow is what determines the ceiling temperature.  I'll stand by…"
Sep 3
Hal Skinner replied to Kurt Shafer's discussion Where can I find the best radiant barrier to install under my roof?
"Morning Kurt. I can point you to one in private message but not on the open forum.  We are not allowed to promote any products.    You can email me at hal.skinner@yahoo.com or you can call me at 209 556 0764.  I w2ill be here…"
Sep 3
Kurt Shafer replied to Kurt Shafer's discussion Where can I find the best radiant barrier to install under my roof?
"Hal, I was expecting you to make a recommendation. Bud, I did not say my attic was 90. I said my ceiling was 90 in the west facing bedroom at 4 PM in Temecula CA when the outside air was about 100. The attic was far hotter. In an earlier comment I…"
Sep 3
Bud Poll replied to Kurt Shafer's discussion Where can I find the best radiant barrier to install under my roof?
"Hi Kurt, You mentioned "On a RESNET discussion some insulation experts agreed that insulation will not prevent hot attic air from heating ceilings."  I suspect there is more to that discussion as that statement isn't entirely…"
Sep 2
Kurt Shafer commented on Hal Skinner's group The RCC Classroom (Radiant Control Coatings)
"Wow, I am very sad to hear about your eyes.  Would have been super to do that comparison. Good luck.  Perhaps I should do this experiment...What RCC do your recommend and can I apply it?"
Sep 2

Profile Information

Company
Invisco Whole House Fan Company
Professional Certification
BSEE USC
Professional Interests
Energy conservation, ventilation techniques, attic insulation perfection.
Website URL
http://www.invisco.com

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What is your opinion about members promoting products here?

Hello,

I am a whole house fan and attic ventilation expert in Temecula CA. I started studying whole house fans in 2008 when my wife, Darlene, and I moved from Manhattan Beach. I would really like to share my knowledge with all of you but I want to be sure I don't antagonize you with more commercialization than you want. Please let me know your opinion and if you can, send me some examples of acceptable blogs and unacceptable ones. 

Posted on July 18, 2014 at 9:02am — 11 Comments

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