Flex FB 50 PVC User Manual

Product Data Sheet

FLEX FB 50 PVC ROOF SYSTEM

(76” and 120” Wide, Reinforced, Thermoplastic Roof Membrane)

PRODUCT DESCRIPTION

The Flex FB 50 PVC (polyvinyl chloride) Roofing Membrane is a high-performance thermoplastic
membrane designed for mechanically attached or adhered roofing applications. The Flex FB 50 PVC
Roofing Membrane is manufactured in a thickness of 50 Mils of polyester reinforced membrane with a

5.50 oz. polyester fleece backing.
For re-roofing installations, the fleece backing serves as a separation or cushioning layer between the

membrane and a pre-existing, smooth built-up or cap sheet surface, including structural or lightweight
concrete decks and various types of insulations. In adhered and mechanically attached applications, the
Flex FB 50 PVC Roofing Membrane can be installed directly over most substrates with excellent results.

FEATURES AND BENEFITS
The Flex FB 50 PVC Roofing Membrane has been specifically designed for use over minor

imperfections, splits or ridges that may have formed in the existing roof system. The fleece backing acts
as a cushioning layer which prevents abrasion problems and keeps small imperfections or ridges from
coming in contact with the membrane, eliminating the need for insulation or slipsheets.

The unique combination of the quality performance and longevity of the Flex FB 50 PVC Thermoplastic
Roofing Membrane with the durability and added protection of the fleece backing provides the building
owner with an unmatched, superior roof system.

MECHANICALLY ATTACHED INSTALLATIONS
The Flex FB 50 PVC Roofing Membrane is ideal for use as a mechanically attached membrane over

approved existing roof surfaces. The fleece backing minimizes the effect of minor imperfections in the
substrate, which greatly improves the overall aesthetic appearance of the completed project and eliminates
the need for insulation in most cases.

ADHERED INSTALLATIONS
The Flex FB 50 PVC Roofing Membrane offers distinct advantages in adhered applications over

lightweight and structural concrete and a variety of insulation and deck types with proven results when
adhered with Flex’s WB (Water-Based) PVC Substrate Adhesive. The superior wind uplift performance
achieved by the Flex FB 50 PVC Roofing Membrane adhered roof system meets Factory Mutual's Class
1-270 over lightweight concrete, which allows for high rise and coastal region installations in the most
extreme weather conditions.

Flex Membrane International Corp. 2670 Leiscz’s Bridge Road, Suite 400, Leesport, PA 19533

Tel: [phone] Fax: [phone] www.FlexRoofingSystems.com

Page 1

APPROVALS
The Flex FB 50 PVC Roofing Membrane exceeds the requirements of ASTM D4434 standard for

thermoplastic sheet roofing. The Flex FB 50 PVC Roofing Membranes meet a wide range of Factory
Mutual's wind uplift requirements up to a FM Class 1-735 when installed on a Structural Concrete Deck.
The FB 50 PVC Roofing Membrane can also be assembled in a variety of adhered and mechanically
attached roof applications that meet Underwriters Laboratories Class A fire rating.

FLEX FB 50 PVC ... RELIABLE, TIME TESTED ROOF SYSTEM
The ease of the Flex FB 50 PVC Membrane one-step installation process provides overall time and labor

savings advantages as well as the superior performance and durability of PVC (polyvinyl chloride) which
can withstand the harshest of climates and the most punishing UV and aging tests available. The Flex FB
50 PVC Membrane seams are hot air welded which are as strong as the membrane itself and creates a
quality watertight seal that will not break down over time. The fleece backing ensures added protection in
those areas where there is excessive foot traffic. Overall, the Flex FB 50 PVC Roofing Membrane is the
roof of choice when you need a dependable and reliable roof system which will out perform all
requirements and expectations.

PHYSICAL PROPERTIES

Property Test Procedure Specification

Color white, tan or gray
Thickness ASTM D751 .050”
Breaking Strength (lbf) ASTM D751 256 x 242
Tear Strength (lbf) ASTM D751 99x70
Seam Strength (lbf) ASTM D751 297
Elongation ASTM D751 57% x 54%
Static Puncture Resistance ASTM D5602 Pass
Dynamic Puncture Resistance ASTM D5635 Pass
Heat Aging ASTM D3045 >90%
Low Temperature Bend ASTM D2136 -40°F
Water Absorption ASTM D570 1.5%max
Linear Dimensional Change ASTM D1204 0.25%
Accelerated Weathering ASTM G155 Pass
Solar Reflectivity ASTM C1549 .82 (white)
Emissivity ASTM C1371 .91 (white)
SRI ASTM E1980 109

Flex FB PVC membrane is thermoplastic in nature and exceeds the requirements of ASTM D4434
standard specification for poly (vinyl chloride) sheet roofing.

WARRANTY

The Flex FB 50 PVC Roofing Membrane may receive the manufacturer's standard five (5) year, ten (10)
year or fifteen (15) year guarantee of watertightness.

Flex Membrane International Corp. 2670 Leiscz’s Bridge Road, Suite 400, Leesport, PA 19533

Tel: [phone] Fax: [phone] www.FlexRoofingSystems.com

Page 2