Quote:
Originally Posted by johnlvs2run
What kind of metal roof do you have, and what color?
Did you install it yourself?
I'm interested to see what indoor temperature change you see with the metal roof and radiant barrier foil.
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I didn't install the radiant barrier on the roof, nor did I install the new roof myself. I ordered the radiant barrier myself and picked out the roof material and had a friend that is a contractor install it for me. The color of the metal roof is burgundy, but the radiant barrier is about an inch below the metal roof so most of the heat the burgundy roof absorbs is lost in the 1" air space, reflected off the radiant barrier and is vented out from between the metal and the sub roof. Even though we've still be seeing outdoor highs during the daytime of 80-85* most days we haven't needed the a/c for the last 2-3 weeks. We've had a couple windows open and stayed comfortable. I also placed R-13 insulation and radiant barrier to the inside walls and ceiling of my garage, which I did do myself. I'm really not sure how much temperature difference the radiant barrier made to this garage, because I installed it shortly after having it built, but at the previous home we had in NC when I installed radiant barrier to the walls and ceiling of that garage without any other insulation it probably lowered the interior temperature by at least 10-20* on a 95-100* day. This summer when I would go into the garage it was warm, but I could tolerate the heat without any problem. The exterior of the garage is tan metal also with a burgundy roof. This summer has been a really hot summer for this area and I kept the house (1400 sf.) at about 75*, our highest electric bill was about $112. and the next highest was about $100. During the winter the radiant barrier also helps to reflect the heat back into the house preventing some heat loss thought the roof. When I got the barrier and new roof on the house it was late winter, but I could tell a difference in how well the house held heat after it was installed. If I ever have to have the siding on the house replaced I'm going to wrap the wall with radiant barrier before the new siding goes on. We live in a 1400 sf modular home and my mom lives in a 1400 sf stick built brick home with more insulation than we have, but she doesn't have radiant barrier. This summer our house was cooler than mom's and the electric bills were about $30.-$40. less per month than her's. The cost of the radiant barrier was $345. (including what was used on the garage) and the person who rolled it onto the roof and fastened it down charged me $100. more than he was going to charge just to put the roof on, so I'd say with savings associated with a/c and heat the pay back will probably be in the 1-2 year range.