Made from a proprietary waterproofing adhesive compound that is integrated into a nonwoven geotextile fabric, this membrane is coupled with high-density polyethylene (HDPE)

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. In addition to protecting indoor air quality, Blindside Membrane is also a barrier to methane gas and radon gas.

The membrane is highly useful in areas where vertical, positive-side waterproofing is required, but access to the positive side is made impossible due to the soil retention system. The toughness adhesive of this membrane eliminates any kind of moisture intrusion into the structure. The membrane is further covered with a removable, silicone-coated release sheet. One-sided wall-forming systems are the best choice for applying this membrane due to the absence of form ties. It should be monitored that the structure is free from any form of debris that could potentially damage the Underseal Blindside Membrane. The membrane can be used in timber lagging systems, steel sheet piling systems, caisson, and short retention systems. The membrane must be kept in a place protected from flames, heat, sparks, cold, and lack of ventilation. It should not be exposed to sunlight for over 30 days.

Film Color: Black/White
Membrane Thickness ASTM D 1000: 73 mils
Tensile Strength ASTM D 4632: 80 lb.
Tensile Strength, Film ASTM D 412: 4,250 psi
Hydraulic Transmissivity of a Geosynthetic Using a Constant Head ASTM D 4716: No measurable flow
(In-Plane) Hydraulic Transmissivity of a Geosynthetic by Radial Flow ASTM D 6574: No water flow
Resistance to Fungi in Soil GSA-PBS 07115 _ 16 weeks: No effect
Resistance to Permeance by Methane Gas ASTM D 1434 tested using 99.99% purity: 7.2 x 10-7 ft3/ (ft2 ?hr ? psi)
Resistance to Radioactive Radon Gas Radon Reduction Technology Laboratory % reduction in radon gas diffusion: 97.10%
Lap Peel Adhesion ASTM D 1876: 9.02 lb./in.
Puncture Resistance, Minimum ASTM E 154: 217 lb.
Resistance to Hydrostatic Head, Minimum ASTM D 5385: 231 ft.
Peel Adhesion to Concrete ASTM D 903: 14.9 lb./in.
Elongation _ Ultimate Failure of Rubberized Asphalt Compound ASTM D 412: > 460%
Water Absorption, Maximum ASTM D 570: 0.1%
Low Temperature Flexibility ASTM D 1970 180? bend over 1? mandrel at -20?F (-29?C): No effect
Breaking Strength Of 1? Width Sample Polyethylene Geomembrane Layer ASTM D 882: 6500 psi
Permeance to Water Vapor Transmission, Maximum ASTM E 96 Method B: 0.01 perms.

Polyguard Products Blindside Waterproofing Membrane - 4' x 50'

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