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Ask for roofing made with Elvaloy® KEE

To make sure your roofing project has the long-lasting performance of DuPont™ Elvaloy® KEE, ask for it by name when preparing your bid package or getting estimates. Check the manufacturer's technical literature for properties, specifications and code approvals of their membranes containing Elvaloy®.

Descriptive terms used in the technical literature referring to Elvaloy® KEE include "ketone ethylene ester (KEE)" and "ethylene interpolymer (EIP)."

Not all PVC roofing contains Elvaloy® KEE

Most membranes made with Elvaloy® KEE are included in a generic class called "thermoplastic," which includes PVC. However, not all PVC roofing contains Elvaloy®. Only PVC with Elvaloy® KEE has the advantage of a solid phase (non-migrating) flexibilizer to prevent embrittlement and assure easy maintenance over the service life of the installation.

Consider the total life-cycle cost of a roofing system

The total cost of a roofing system is affected by the materials chosen, installation, maintenance and final disposal requirements over the useful life of the roof. The long-term durability and ease of working with roofing systems based on Elvaloy® KEE makes them very competitive. Efficient installation, clean and easy repairs, and delayed replacement also mean less business disruption, less occupant inconvenience, and less worry for facility managers.

Specifying Elvaloy® KEE also helps assure your roof is installed by experienced, professional contractors who share your value for long-term performance. Good roofing contractors build their reputations by installing and maintaining problem-free roofing, and their skills and experience are your very best assurance of leak-free buildings, now and in the future.

Many manufacturers and installers of roofing systems using Elvaloy® KEE are mentioned in the case histories included on this Web site.

The proof is in the roof

Read about projects from leading roofing system manufacturers.

Learn more about DuPont™ Elvaloy® KEE