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A HIGH-STRENGTH Insulating Moisture Barrier for use below Heated Concrete Floors. An absolute moisture barrier, it keeps heat-robbing ground moisture away from the concrete.<br><br> Reduces downward heat loss by over 50%. Exceeds the requirements of most HVAC load calculation programs. Super-Strong 338 PSI Puncture Resistance. Will support over 6" of concrete plus floor loads indefinitely.<br><br> Total of Over 16 mil Extruded Polyethylene Film. Withstands rough handling by installers and finishers. Air-Encapsulating Vacuum Formed Bubbles. Results in a structure that will not delaminate. Laminated With 99% Pure Polished Aluminum. Adds a reflective benefit to the intrinsic R-value.<br><br> PET Coating Strengthens and Protects Foil Against Chemical Erosion. Tuff-Stuff can be laid with the foil side up or down, whichever is most convenient. 4' x 125' Roll.