In June when it was 100 degrees outside my attic was 108. I also have dark shingles, lots of ridge vents and all the soffits are perforated vinyl. I was happy it was only 8 degrees hotter than outside.

0 ...

Report Post

Posted by MikeBRLA

Baton Rouge

Member since Jun 2005

16478 posts

Posted on 8/4/22 at 12:03 pm to calcotron

quote:
Why don't shingles reflect that mess? Seems dumb not to. Dammit.

This article explains why…it’s physics.

LINK

1 ...

Report Post

Posted by calcotron

Member since Nov 2007

8313 posts

Posted on 8/4/22 at 1:46 pm to MikeBRLA

I get that, I mean why not have the shingles be what reflects the energy off the primary surface. Not directly under hot shingles.

1 ...

Report Post

Posted by Meauxjeaux

98836 posts including my alters

Member since Jun 2005

40102 posts

Posted on 8/5/22 at 10:12 am to calcotron

What is the consensus on radiant barriers and how they affect roof underlayment, decking and shingles themselves?

Does it make any difference at all? Are they getting that much heat anyway? Is the barrier sandwiching extra heat between the shingle and the barrier?

2 ...

Report Post

Posted by CrawDude

Baton Rouge

Member since Apr 2019

5285 posts

Posted on 8/5/22 at 3:33 pm to Meauxjeaux

quote:
What is the consensus on radiant barriers and how they affect roof underlayment, decking and shingles themselves?

Although shingles can get hotter with the presence of a radiant barrier research studies in FL show that they do not shorten the life of the roof. That information is on-line.

0 ...

Report Post

Posted by turkish

Member since Aug 2016

1786 posts

Posted on 8/6/22 at 9:56 am to Meauxjeaux

Whether it truly impacts it or not, do shingle mfgs warranty the product with radiant barriers installed? I honestly don’t know. That would be my primary concern.

I’m thinking about setting up a little experiment to prove the radiant barrier concept to myself. I understand the science but I’m still a skeptic.

This post was edited on 8/6/22 at 9:57 am

Page 1 2