... * 20m~40m/roll Feature: 1Waterproof, heavy duty, clean, light, flexible, non-absorbent surface2 Fire resistant & antiglare3Recyclable, environmentally friendly4Effective in extreme temperatures ... Application: 1 Building Thermal Insulation Material(1),Roof,Underlay,Under Concrete & floor Insulation; (2),Attic,Crawl Space,Stud Wall ,Metal Frame Building ...