Manual

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Flex Membrane International Corp. 2670 Leiscz’s Bridge Road, Suite 400, Leesport, PA 19533
Tel: [phone] Fax: [phone] www.FlexRoofingSystems.com
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acceptable. The substrate must be clean, smooth, dry, and free of flaws, debris and other irregularities.
Follow Flex Specifications and NRCA recommendations for installation of wood nailers around perimeters
and penetrations. Install approved insulation according to Flex’s standard fastening requirements or
applicable code whichever is more stringent. The membrane is mechanically attached using the disk and
fastener in the seam method. Fastener spacing increments are determined by the projects specification
criteria and or printed guide specifications. For adhered systems, the membrane is laminated to the
appropriate substrate using Flex Fleeceback Substrate Adhesive. All seams are completed by the hot air
welding method. Contact the Flex Technical Service Department for the specific design requirements and
installation procedures for these two systems.
PHYSICAL PROPERTIES
Property Test Procedure Specification
Color white, tan or gray
Roll Size 5’x50’, 10’x50’
Weight 10’x 50’ roll = 232 lbs.
5’x 50’ roll = 116 lbs.
Thickness ASTM D751 0.080”
Thickness over scrim ASTM D751 0.034”
Breaking Strength (lbf) ASTM D 751 450 x 400
Seam Strength (lbf) ASTM D751 140
Elongation (min%) ASTM D751 30%
Heat Aging ASTM D573 >90%
Tear Strength (lbf) ASTM D751 70 x 170
Cold Brittleness ASTM D2137 -40° C Pass
Dimensional Change ASTM D1204 0.4%
Water Absorption ASTM D471 0.7%
Ozone Resistance ASTM D1149 Pass
Weather Resistance ASTM G155 Pass
Permeance ASTM E96 0.01 perms
Hydrostatic Resistance ASTM D751 430 psi
Reflectivity (white) ASTM C1549 0.76
Emissivity (white) ASTM C1371 0.90
SRI (solar reflectance index) ASTM E1980 109
Flex FB 80 TPO Plus membranes meet or exceed the requirements of ASTM 6878 Standard Specification
for Thermoplastic Polyolefin (TPO) Based Sheet Roofing.
WARRANTY
The Flex TPO FB 80 Roofing Membrane may receive the manufacturers standard five (5) year or optional
ten (10) year, fifteen (15) year , twenty (20) year or twenty-five (25) year guarantee of watertightness.