Underseal® Blindside™ Membrane is a 73-mil, pre-concrete pour, strong sheet membrane waterproofing with a thick, cross-laminated, high-density polyethylene (HDPE) backing, laminated to a thick layer of proprietary waterproofing adhesive compound integrated into a nonwoven geotextile fabric.
Underseal® Blindside™ Membrane is used as a waterproofing membrane where vertical, positive-side waterproofing is required, but access to the positive side is impossible due to the soil retention system. Once the concrete is poured against the Blindside™ Membrane, the concrete cures and a mechanical bond forms to secure the concrete to the membrane. Also, subsequent to concrete placement, cold flow of the waterproofing compound will take place and an adhesive bond will be added to the mechanical bond given by the fibers. With both a mechanical and adhesive bond, the concrete will be tightly sealed and bonded to the membrane, creating superior protection against moisture intrusion. 73-mil Underseal® Blindside™ can also be used in certain horizontal applications. Contact Polyguard for more information.