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Question DetailsAsked on 11/29/2011

are replacement metal roofs energy efficient

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3 Answers


I am not a metal roofing expert, but we do a fair big of architectural copper work. We also do alot of custom gutters, so I know a little about the metals that are available.

First when you say "energy effecient" I am assuming you mean reflective, or in other words won't gain solar heat from the sun. Correct? If this is what you mean, then the answer is No, not ALL metal roofs are energy effecient.

A black metal roof will hold more heat than a white metal roof, making the black roof energy in-effecient. That heat may be transfered into the attic and/or living space. When it comes to pained metal, I work primarily with Kynar coated products. In my area these Kynar painted metals are distributed by a number of locations and Kynar is very common across the country, if not the world. I bring this up because Kynar has designed which of their colors are "Cool Colors" and will reflect solar heat gain.

I hope this helps, good luck!


Answered 8 years ago by ReliableAmericanRoof


Metal roof better then shingle roof but you can't have both . If you want energy sfficient roof use combination metal roof and insulation . You will have relible roof and good R value.
Serge Construction & cabinetry (919)295-4160

Answered 8 years ago by Serge Construction


A common misconception on sloped roofing is that reflectivity will make a big difference. It can and it can't depending on how your roof is engineered.

Is it a "Warm deck" or "cold deck" design? The term "deck" refers to the substrate. The substrate of a sloped roof is most often wood, in modern construction it is most often plywood. On buildings built before WWII, it was 1" dimensional lumber. For your refrence most sloped roofs, not all, are cold deck designs.

So what is the difference? Well, quite simply a cold deck design means that the substrate is cold. If you think of a simple traditional sloped roof you will find that the ceiling is most often insulated and the roof is ventilated. The ventilation evacuates and heated or humid air, while the insulation in the ceiling helps prevent thermal transfer from the attic space into the living space. A warm deck design is different in the fact that there is most often NOT any ventilation, and the insulation is at the substrate (at the deck). This insulation is what makes the deck design a warm deck.

So, why do I bring this up? Well for two reasons. In most cases I highly recommend sticking with what you have no, and honor the original architecture of your building. Mixing the two warm deck and cold deck designs creates a warm zone and this can create serious problems in the warm zone including wood rott and mold. The other reason I bring this up is because the solar heat gain on a properly ventilated attic space (cold deck design) is very very minimal.

I beleive it was the University of Illinois in conjunction with AirVent Inc. (I could be wrong about the two entities, this is off the top of my head) performed a study of a black asphalt shingle roof to a white asphalt shingle roof. The purpose of the study was to determine actual heat gain of a reflective roof, when properly ventilated. The conclusion was that the attic temprature difference of a properly ventilated white vs black roof was only 2 degrees. When the ventilation is allow to do its' job, it will do its' job well!

Therefore it is my opinion that reflectivity is not as important as ventilation (assuming your roof structure is a cold deck design.)


Answered 8 years ago by ReliableAmericanRoof

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