Elvaloy® KEE for PVC Roofing

Long Lasting Flexible PVC Roofing

PVC roofing made with DuPont™ Elvaloy® KEE delivers long service life in demanding environments.

DuPont™ Elvaloy® KEE is a unique ketone ethylene ester (KEE) terpolymer supplied in pellet form to makers of durable low-slope PVC roofing membranes.

When soft, high-molecular-weight Elvaloy® KEE is mixed with a more rigid material such as polyvinyl chloride (PVC), the resulting compound becomes tougher and more flexible.

The elastomeric properties of Elvaloy® KEE are accompanied by convenient melting properties for thermoplastic processing. This makes the compound ideal for coating onto woven fabrics or scrim materials which are embedded in high-quality PVC roofing membranes to help fight against cutting, punctures or shrinkage. The thermoplastic characteristic of the compound makes heat-welding easier during installation and repair.

As a solid-phase flexibilizer, Elvaloy® KEE won't migrate out of the PVC roofing system, even when exposed to chemical pollutants such as grease or fuels. Chemicals such as these tend to extract many other plasticizers, causing membranes to lose flexibility and become brittle. The permanent flexibility and chemical resistance of roofing membranes made with Elvaloy® KEE makes them a proven performance leader in single-ply PVC roofing.

PVC roofing membranes made with DuPont™ Elvaloy® KEE are among the most durable, fastest to install, and easiest to maintain in the industry. Roofers experienced with thermoplastic membranes enjoy the reliable heat-welded seams and carefree performance of a strong, high-quality roofing product. Building owners who want their PVC roofing to last as long as possible, or who need extra resistance to weather and chemical attack, can specify PVC roofing made with DuPont™ Elvaloy® KEE terpolymer to assure decades of problem-free service.

Benefits of PVC roofing made with Elvaloy® KEE include:

  • labor-saving installation
  • strong, heat-welded seams
  • easy tie-ins
  • easy cut-outs or repairs
  • outstanding chemical resistance
  • enables light colored and cool roofing

For more information, please go to the Flexible PVC Roofing.


  • Flexible PVC Roofing

    There are many benefits of flexible PVC roofing made with DuPont™ Elvaloy® KEE, including delivering long service life in demanding environments.

  • PVC Modification

    Polymers and additives for flexible and rigid PVC modification.


  • High-Performance Roofing at Universal Studios

    The installation of more than 40 high-performance roofing at Universal Studios reduces the destructive force of intense UV concentrations and extreme heat produced by the Florida sun.

  • Roof Protection for Wooster High School

    To protect the state-of-the-art Wooster High School installed a FiberTite® single-ply roof protection system was installed.

  • PVC Roof of Senior Living Complex

    PVC roof membrane made with DuPont™ Elvaloy® KEE provides the longevity, energy efficiency and chemical resistance required for a senior living complex.

  • Heat-Reflective Roofing at Shearer’s Foods

    Shearer’s Foods turned to roofing membrane made with DuPont™ Elvaloy® KEE resins for its chemical resistance and heat-reflective roofing capabilities, resulting in LEED® certification.

  • Flexible Roofing Membrane at Bad Sulza

    The homogeneous, flexible roofing membrane material on the Toskana-Therme Dome is highly resistant to environmental effects and has a well balanced strength/elongation ratio.

  • FiberTite® Airport Roof

    FiberTite® airport roof with Elvaloy® KEE resists jef fumes, environmental issues at the Navy/Marine Corps Reserve Center next to Orlando's Executive Airport.

  • Cool Roof at Texas Schools

    The Flex Cool Roof System used at Texas schools can reduce roof temperatures from 180° for a black roof to 90° for a white roof.

  • Cooley C3 Mobile Home Roofing Membrane

    In sunny Florida, the popularity of mobile homes is high. Also high are the temperatures on these mobile home roofing surfaces, which can lead to early roof failures.

  • Alwitra PV Roofing Membrane

    Alwitra's PV roofing membranes deliver weather protection plus solar power to FKT-Formenbau und Kunststofftechnik GmbH in Triptis, Germany.

  • Weather-Resistant Roofing in the Sunshine State

    International Paper specified a single-ply chemical- and weather-resistant roofing membrane based on DuPont Elvaloy® KEE.

  • Thermoplastic Roof Membrane Solves Time, Budget

    Using thermoplastic roof membrane and retaining old foam roofing delivers multiple benefits for Ohio-based packaging products factory.

  • Stormproof Roofing on Florida Condos

    Seaplace Condominiums, Longboat Key, Florida, relies on an innovative, single-ply stormproof roofing membrane containing DuPont™ Elvaloy® resin to eliminate water leaks and other storm-related damages.