Newer roofing products are coming on the market more and more. They are making big claims about their energy saving methods on how you can benefit by their purchase and installation. It is fair for you to be skeptical and accept all the claims with a grain of salt. Does their claim make sense? How does their costs compare with the savings recovery time frame? What are the product warranties and how do they apply to their actual use?
The biggest savings claims are more centered on solar reflective values. This is all fine but it will not have a great effect on the temperatures in your attic. Hot summer days mean that your attic is going to be hot. To base the value of an energy savings method on the products reflective ability will mislead you into thinking that you will be able to realize large savings with your energy bills.
There is an entire industry built around energy savings concepts. They depend on your support to be able to flourish so if you just want to feel good about the idea then, utilize these products. You should not expect to be able to realize much more than a fraction of what they claim. All roofs are comprised of multiple and different materials that have to be penetrated before the radiant heat is transferred into your attic. Then the heat must penetrate past your insulation before it has an effect on the interior of your home. The temperature of the interior of your home relies far more on the walls, windows and doors than on anything else. Always remember that heat rises.
A good example of a common sense equation is this: Metal roofs are touted for being energy savers due to their reflective abilities and the increased reflective ability they have with some of the lighter colors. The installation of a metal roof requires an approved underlayment to be used as is with all roofs, between the metal panel and the plywood decking. To be an approved underlayment for use with metal roofing panels, it must have a higher temperature stability rating. If it does not, it will not hold up. It will break down and could melt. This is because the back sides of the metal panels get much hotter than other types of roofing materials. Metal roofs do reflect a great deal of UV radiation but they still transfer a greater amount of heat to the sub-layer materials and presumably your attic. Metal roofs are excellent roofs. They just should not be purchased because of assumed energy savings.
The truth is this: On a hot summer day, go into your attic area and put your hand on the backside of the plywood roof decking. Regardless of the type of roof you have or the color of your roof, the plywood will feel the same and quite warm. Don't get tricked into purchasing something that will not perform as you expect.