Metal roof: pros and cons of going white
My shingles need to be replaced and I'm having a standing seam roof installed. Buy once cry once... Anyway, I'm a little bit torn on the color. Aesthetically, I'm pretty flexible, since I'm also having the stucco re-done soon and will be able to color it whatever will look good with the roof. I live in zone 5b in New Mexico. We need more heating than cooling, but the summer heat can be pretty unbearable. I use evaporative cooling due to the low humidity so my cooling bills are fairly low.
Obviously a white roof would be the best choice for reducing the cooling loads. But what would the winter heating penalty be? I'm having a hard time finding anything other than extremely general information like "the winter heating penalty will be small and offset by the summer cooling gains." This seems like a very California-centric point of view!
I tried the energy-star-affiliated roofcalc.com but it predicted that the increased winter heating loads would result in the consumption of an extra 100 therms of natural gas. Can this possibly be right? Is there a better way to figure this out?
Posted Sat, 06/21/2014 - 20:38
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