Read This Before You Redo Your Roof - This Old House
Dark granules on laminated asphalt shingles absorb the sun's radiation, pushing heat into the building, which explains why an attic can be 50 to 85 degrees warmer than the outside temperature on a hot summer day. Cool-roof asphalt shingles help lower that difference to just 5 or 10 degrees by using granules coated with a highly reflective ...