... Heat reflection, heat insulation, and sound insulation, anti-radiation and shielding.4. Moisture barrier, waterproof, good sealing property, heat ... breathable film. With the functions of air impermeability, waterproof and dampproof, it is widely used in building construction. ... efficient, healthy method of temperature control and energy savings. [Anti-UV] Waterproof and Breathable Roofing Underlay