Q. Will My Roof Shingles Overheat With an Unvented Attic?
A. No. Modern tests have demonstrated that shingle temperature is primarily a function of shingle color and solar heat gain, not attic ventilation. In fact, most attics greatly exceed outdoor air temperature during the summertime. A good analogy is that of a black car parked in the sun on a hot day; no matter how much the interior of the car is air-conditioned, the top of the car will still be scalding hot from solar heat gain. In tests conducted in Nevada, funded by the U.S. Dept of Energy, unvented attics with spray foam showed an increase in shingle temperature that never exceeded 7°F more than the vented attics – well within the manufacturer’s recommended limits. In the Northeast, the shingle temperature change is even less significant, especially if you have shading.

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