4 ft x 125 ft (500 sq ft). This insulation product consists of 1 layer of 5/32" (4mm) polyethylene bubble that is sandwiched between two metalized, low emissivity surfaces. The R-value ranges from 4.9 to 14.1 (see "Technical Data" tab below). The polyethylene encapsulated air bubbles serve as an effective thermal break as well as a vapor barrier while the two outer metalized surfaces reflect up to 96% of all radiant energy. Important - Use reflective tape to seal seams which improves performance.
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