RadiantGUARD ULTIMA Radiant Barrier Attic Foil Insulation Roll 48-inch 500 square feet (U-500-B) &ndash; Reflective Aluminum Breathable House-Wrap &ndash; BLOCKs 97% of Heat / 99% RF Signals SCIF RFID 500 SQUARE FEET ROLL (15 lbs): 125 linear feet BREATHABLE (perforated) DOUBLE-SIDED pure aluminum foil radiant barrier insulation; reflects 97% radiant heat USED IN RETROFIT & NEW CONSTRUCTION: Reduces residential attic temperatures up to 40 degrees; lowers utility bills year round. Thermal insulation used in attic space, garage, garage doors, housewrap, workshop, shed, storage unit, commercial metal building, pole barn, as pallet wrap, and more INDUSTRIALIZED GRADE: Is TEAR & PUNCTURE PROOF yet cuts easily with utility scissors or hack saw. Reflects 97% of the radiant heat EASY TO MAINTAIN: Non-toxic; non-carcinogenic; fiber free; easy to install; not affected by humidity; maintenance free; does not promote the growth of fungi or bacteria; does not support nesting by rodents or insects ASTM CERTIFIED: Meets all American Society for Testing and Materials (ASTM) requirements for radiant barrier classification (C1313) Exceeds all FIRE, SMOKE, (ASTM E-86) and BREATHABILITY requirements for building materials (ASTM 96-00). BLOCKs 99.06% of RF signals (IEEE-299) for Sensitive Compartmented Information Facility SCIF rooms