>>>500sqft Rolls (4ft x 125ft) >>>4 mil Perforated For residential retrofit, particularly in the attic laying over existing insulation, and some OEM applications. Available in 500 and 1,000 sq. ft. rolls or custom lengths. Only available in perforated 4' widths. Super R Diamond® brand radiant barrier was the first product developed by Innovative Insulation. Super R Diamond® is two-sided reflective aluminized polyester film with reinforced scrim inside, designed to reflect radiant heat no matter what the season. Choose Super R Diamond® to retrofit an existing structure. It can be stapled to the underside of the roof rafters in an attic.