500 sqft (25.5 inch thick Rafter Cut) of NASA TECH Commercial Grade Perforated No Tear Green Energy Radiant Barrier Reflective Insulation Attic Foil Roof Attic House Wrap SCIF RIFD 500 SQUARE FEET PER ROLL: 25.5 inch x 235.2ft Wide rafter version This gives you 500 square feet Double Sided perforated breathable radiant barrier HIGHLY REFLECTIVE: Double-sided (5ply), tear-proof strongest barrier out there. 99.97% Reflective E Value &gt; Highly reflective to reflect radiant heat rather than absorb it . The Commercial Grade Industrialized Barrier is designed to withstand heavy handling and traffic without tearing, puncturing, or overly wrinkling. Cuts easily with utility knife or scissors so you can install it properly with ease. For New Construction or Retrofit: It is non-toxic and does not promote the growth of fungi or bacteria nor does it provide no nesting support for rodent or insects. Works for both new and pre-existing buildings. The material is unaffected by humidity and climate changes so no further maintenance is required upon installation. It is a superior alternative to bulky insulation such as foil-faced bubble wrap. ASTM COMPLIANT Fire Rating: Meets the American Society for Testing and Materials (ASTM) Class 1 Class A fire and smoke safety requirements of most state and local building codes, as well as the breathability standards for building materials. While primarily used for attic rafters and floors, our radiant foil works well for garages, workshops, storage units, barns, warehouses, and even older multi-storied homes that lack sufficient insulation. 120-DAY 100% MONEY BACK GUARANTEE. We offer a No Hassle 120-Day 100% Money Back Guarantee. If, within the four months, you are not completely satisfied with your purchase for any reason, just let us know and we will refund you all your money.