User guide

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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 Fleece back Substrate Adhesive. All seams are
completed by the hot air welding method. All non-factory cut edges must be sealed with Flex Clear TPO
Cut-Edge Sealant. 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, gray or tan
Roll Size 5’x100’, 10’x100’
Weight 10’x100’ roll = 284 lbs.
5’x100’ roll = 142 lbs.
Thickness ASTM D751 0.045”
Thickness over scrim ASTM D751 0.015”
Breaking Strength (lbf) ASTM D 751 430 x 360
Seam Strength (lbf) ASTM D751 100
Elongation (min%) ASTM D751 30%
Heat Aging ASTM D573 >90%
Tear Strength (lbf) ASTM D751 90 x 120
Puncture Resistance FTMS 101C 2031 >290 lbs.
Cold Brittleness ASTM D2137 -40° C Pass
Dimensional Change ASTM D1204 0.2%
Water Absorption ASTM D471 0.7%
Ozone Resistance ASTM D1149 Pass
Weather Resistance ASTM G155 Pass
Permeance ASTM E96 0.070 perms
Hydrostatic Resistance ASTM D751 390 psi
Reflectivity (white) ASTM C1549 0.76
Emissivity (white) ASTM C1371 0.90
SRI (solar reflectance index) ASTM E1980 109
Flex FB 45 TPO Plus membranes meet or exceed the requirements of ASTM 6878 Standard Specification
for Thermoplastic Polyolefin (TPO) Based Sheet Roofing.
WARRANTY
The Flex FB 45 TPO Roofing Membrane may receive the manufacturers standard five (5) year or optional
ten (10) year or fifteen (15) year guarantee of watertightness.