In flashing applications, SubSeal is ideal for use to seal window openings, around doors where high use and movement will occur, under door thresholds and anywhere where high moisture content will be present such as stucco or masonry. Often, commercial structures will specify a 40 mil product, which SubSeal complies with per ASTM D 1970.

SubSeal is composed of a tough, multi-layer, cross-laminated film that is coated with an aggressive rubberized asphalt adhesive system. The high strength, high elongation film accommodates expansion and contraction to waterproof critical areas where air and water can infiltrate the building envelope.

For full Technical Data, 3-Part Guide Specifications, Installation Instructions or to request a free product sample, visit the company’s website at