Well here are some items to ponder: If building a new home, framed with a raised foundation, use R24 under the floors, R19 in the walls and R38 in the ceiling. I like batts because they do not compact, they are easy to work around if you do any attic work, electric etc. Plus with batts, you can see them they are constant thickness and some firms will claim they blew in x inches, do you think you will go up there and measure all of it.???
OK, we had the radiant sheets put up in Atttic. House and Garage. It cost about 1K and it was really worth it. On a hot day say it is less than 90, we do not need the air conditioner. When Bill finished the attic radiant barriers, we saw an instant change for the better in the house because the weather was mainly constant for a few days before and after and we could actually feel the difference. The radiant barrier is not at the shingles, it is inside the attic, a good installer does it all in about 3 hours. We had ours done by BILL MCKENZIE FROM GABLE INSULATORS. My major was heat transfer and I seriously doubt that this will affect the shingles, because most all of the heat into the shingles is radiant energy, not conduction and not by convection, so the radiant energy comes from the sun and the new barriers are inside the roof sheeting in the attic. We really believe in them for sure.
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