Stevens EV® is a high performance PVC membrane based on DuPont's Elvaloy® HP polymer.  Elvaloy® HP is a high molecular weight, solids phase flexibilizer that will not migrate from the sheet and gives Stevens EV its superior physical properties, appearance and color after installation and years of exposure to the elements. Stevens EV® is ideally suited for new and re-roofing applications. Stevens EV® is available in 45-, 50-, 60- and 80-mil (1.14-, 1.27-, 1.52, 2-mm) thicknesses on 76.5-in. wide by 100-foot rolls, and 80-mil thickness (2-mm) on 78-in. wide by 75-foot rolls. Stevens EV® is packaged in standard rolls that are 76.5-in. wide X 100-feet long (1.9m wide x 30m long). Also available are 38.25" (0.97m) wide rolls for perimeter enhancement and 76.5" (1.9m) wide rolls in custom lengths (over 100', 30m) to maximize construction quality and productivity.

Stevens EV® membranes exceed ASTM D 4434 – 04, Standard Specification for PolyVinyl Chloride Sheet Roofing*. 

In addition, Stevens EV® membranes are manufactured in an ISO 9001:2000 registered facility.

Highly durable and flexible Stevens EV® can be installed using a wide variety of assembly options:

In addition, Stevens EV® membrane remains hot-air weldable throughout its life.  If new equipment is later added to the roof or other alterations are made, the Stevens EV® membrane can be cut, repaired thoughout its life, permitting an Authorized Stevens Applicator to easily modify and re-weld.

Mechanically attached Stevens EV® has achieved Factory Mutual Global Windstorm Classification Ratings up to 1-195 and is UL Class A and B listed on both combustible and non-combustible roof decks. Please consult the current FMG and UL Approval Guides for a complete description of all approved assemblies.

Stevens EV® with Elvaloy® HP resists many chemicals and substances that quickly degrade other roofing materials such as animal fats, jet fuel, compressor oil and hexane. 

Stevens offers warranties on successfully completed roofs installed by a Stevens Authorized Applicator. These warranties range in scope from coverage of the materials only to that of the entire system assembly for a time of 5 years up to, for some systems, 20 years.