GFG Series GEL-FLEX Protection Sheets & Vapor Barriers

Chemical-, Puncture-, UV-Resistant, Class A HDPE Membranes

Description: GFG Series protection sheets are membranes constructed to restrict chemical and moisture migration through Kingfield’s Gel-Flex polymer rubber gel waterproofing systems. These materials are made from proprietary polyolefin resins and have been independently tested against ASTM E 1745 requirements (Standard Test Methods for Water Vapor Barriers used in contact with earth under concrete slabs) showing superior permeance and physical properties.

GFG membranes are available in several thicknesses: 11, 16, 21, 26, and 31 mil thickness in corresponding GFG designations: GFG11, GFG16, GFG21, GFG26, and GFG31.

GFG20X: Kingfield’s GFG Series are also offered as a HDPE-fleece composite membrane. For added strength, 16 mil GFG HDPE membrane is laminated to 15 mil polypropylene nonwoven geo-textiles to meet the toughest performance specifications. The geotextile provides cushion, increases grip, and ensures positive contact with the Kingfield Gel-Flex systems.

Related Project Profiles:

Property Test Method Unit GFG11 GFG16 GFG21 GFG26 GFG31 GFG20X
Tensile Strength ASTM D 882 lbf/in 50 83.75 85 >100 >100 136
Puncture Resistance ASTM D 1709 grams 2400 3960 4750 >5076 >5076 5210
Chemical Resistance ASTM E 154 Unaffected Unaffected Unaffected Unaffected Unaffected Unaffected
Water Vapor Permeance ASTM E 96 Perms (US) 0.020 0.007 <0.01 <0.01 <0.01 0.007
Vapor Barrier Classification ASTM D 1745 Exceeds Class A, B, C A, B, C A, B, C A, B, C A, B, C A, B, C
Life Expectancy ASTM E 154 Indefinite Indefinite Indefinite Indefinite Indefinite Indefinite
Material Thickness mil 10±10% 15±10% 20±10% 25±10% 30±10% 30±10%
Standard Dimensions Feet 12.75 x 200* 12.75 x 150* 12.75 x 110* 12.75 x 90* 12.75 x 75* 6 x 150
Area per Unit Square Feet 2,550 1,912.50 1,402.50 1,147.50 956.25 900
Weight per Unit Pounds 131 137 94

System Overview:

System Components:


6" cold-applied, single-sided 35 mil butyl tape (VOC-free)



Duroflex is a 60 mil uncured neoprene flashing used on exposed walls, curbs, penetrations, expansion joints, and angle changes


System Details:

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