ThermalCore™ Technology — found in Atlas StormMaster® Shake and StormMaster® Slate shingles made with Core4™ Enhanced Polymer Technology — mitigates the effects of thermal shock.
When an asphalt shingle gets hot in the sun, the asphalt expands and gets gooey. When the shingle gets cold, the asphalt contracts and gets brittle. The constant cycle of gooey and cold leads to granule loss, which can cause accelerating aging, asphalt exposure and roof deterioration.
But with ThermalCore, shingles have more stability and consistency during expansion and contraction. In fact, lab tests show that shingles with Core4 have nearly 20 percent better granule adhesion than standard asphalt shingles.