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TOPIC: Insulation Concerns

heat transfer

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Roofing contractors have told us that metal roofing does not transfer absorbed heat from the metal into the attic. I would like to know if this is correct as I cannot see how it would not transfer the heat into the ttic space. The contractor is to strip the roof of shingles, install a single layer of felt paper and then install the roof material on top. Is that anything that can be done to help keep the attic cool?
Guest User

6/19/2007
There are energy efficient aspects of metal roofing. There are things you can do to make it as efficient as possible. Some metal roofs could, along with underlayment, be installed over your existing the shingles. The thermal mass of leaving the old shingles in plase would be helpful. With ANY roof system, having good attic ventilation is a real plus (unless you're construction methods include a special "hot" attic). Some metal roof systems, have an airgap between the metal and the underlayment. That airgap is very helpful at reducing conductive heat transfer. This applies largely to metal "shingle" style products. Some metal roof systems could also be installed over a grid of vertical and then horizontal battens, creating an airspace beneath the metal which can actually be vented -- this is good too. Metal does have the quality of cooling down quickly when the sun goes down or a breeze blows this is helpful. And, in this respect, aluminum is better than other metals. Very light colored metal roofs are always most reflective. Many metal roofing manufacturers now also have dark colors with reflective pigments in the paint which reduce heat absorption even in dark colors. Still not as good as very light colors but much better than traditional paints. I hope this helps. All Best. Todd Miller
Todd Miller
Isaiah Industries, Inc.

6/20/2007