Duro-Last EV PVC Membrane

Duro-Last EV PVC Membrane is a reinforced PVC roll-good roofing membrane for low-slope roof systems. The 60 mil version is designated EV60. It is part of the Duro-Last range of PVC roof membranes and carries a film that contains DuPont Elvaloy KEE (Ketone Ethylene Ester).

Unlike the fleece-backed EV Fleece membrane, EV60 has no fleece layer. A line of custom-fabricated accessories is made for use with it.

EV60 must not be adhered with Duro-Last Solvent-Grip Spray Adhesive.

EV60 places a weft-inserted, knitted polyester scrim inside KEE-containing films. The EV60 film is a proprietary thermoplastic formulation of resins, plasticizers, stabilizers, biocides, flame retardants and ultraviolet absorbers.

• EV60 film above the scrim: 28 mil, nominal.
• EV60 scrim: an 18 x 9 polyester fabric with weft insertion, with thread treated to prevent wicking.
• Total thickness: 60 mil, nominal.
• Weight: 0.30 lb per square foot.
• Color: white on the top and bottom surface.
• R-value: 0.1 R (0.1 ft2·°F·hr/Btu).

EV60 is supplied in four roll sizes, with 10 rolls on a full pallet. Coverage assumes a 6-inch overlap and the use of Duro-Last Poly or Cleat Plates.

• EV60 roll, 120 in. x 100 ft: approximately 950 ft2 of coverage, 300 lb (EV60).
• EV60 roll, 60 in. x 100 ft: approximately 450 ft2 of coverage, 150 lb (EV60).
• EV60 roll, 30 in. x 100 ft: approximately 200 ft2 of coverage, 75 lb (EV60).
• EV60 roll, 10 in. x 100 ft: a stripping width, 25 lb (EV60).

A EV60 factory line 6 inches from one edge of the sheet marks the overlap. On EV60, marks in the form of an X at 6-inch intervals along one edge space the fasteners, and the outside edge of the seam plate sits flush with the edge of the sheet.

A rounded-corner patch at least 4 x 4 inches, or 4 inches in diameter, is required wherever three or more layers meet in a T-lap. The patch can be made of either EV50 or EV60.

White EV60 is listed with Cool Roof Rating Council ID 0610-0011.

• EV60 solar reflectance: 0.86 initial, 0.71 after three years.
• EV60 thermal emittance: 0.89 initial, 0.88 after three years.
• EV60 solar reflective Index: 108 initial, 87 after three years.

The membrane is used where California Title 24, LEED and similar programs require a highly reflective roof membrane. White EV60 alone can obtain 1 credit in either LEED-NC or LEED-EB, in the Sustainable Sites, Heat Island Reduction category, at an SRI of 108.

EV60 was tested to ASTM D4434, Standard Specification for Poly (Vinyl Chloride) Sheet Roofing. It is classified as Type III, internally reinforced, and also meets or exceeds the Type II requirements. Paired values give the machine direction first.

• EV60 overall thickness, ASTM D751: 0.060 in. (60 mil), nominal.
• EV60 thickness over scrim, ASTM D7635: 0.028 in. (28 mil).
• EV60 breaking strength, ASTM D751 grab method: 462 x 300 lbf./in. The requirement is at least 200 lbf./in.
• EV60 elongation, ASTM D751 grab method: 30% x 27%. The requirement is at least 15%.
• EV60 seam strength, ASTM D751 grab method: 462 lbf. The requirement is at least 346 lbf., which is 75% of breaking strength.
• EV60 tear strength, ASTM D751 Procedure B: 58 x 154 lbf. The requirement is at least 45 lbf.
• EV60 low temperature bend, ASTM D2136: pass at -40 °F.
• EV60 heat aging, ASTM D3045: pass after 56 days at 176 °F.
• EV60 accelerated weathering, ASTM G155: pass at 10,000 hours total test time.
• EV60 dimensional stability, ASTM D1204: 0.14% x 0.05%. The allowable change is 0.5% or less.
• EV60 water absorption, ASTM D570: pass after 168 hours at 158 °F; the allowable change is 3% or less.
• EV60 static puncture, ASTM D5602, and dynamic puncture, ASTM D5635: both pass.
• EV60 fungi resistance, ASTM G21: no sustained growth or discoloration.
• EV60 moisture vapor transmission, ASTM E96 Procedure B, Method A: less than 0.35 U.S. perms.

Three attachment methods are given for EV60.

• EV60 mechanically fastened: to a range of roof deck and wall materials. A slip sheet, insulation or cover board may be required, and the Duro-Last Roll Good Mechanically Fastened Roofing System Specification sets the system requirements.
• EV60 induction welded: the Duro-Bond Induction Weld Roofing System Specification applies, and a slip sheet, insulation or cover board may be required.
• EV60 adhered: to properly prepared roof decks, walls, cover boards and insulations, under the Adhered Roofing System Specification. Solvent-Grip Spray Adhesive is not permitted.

EV60 rolls are stored lengthwise on pallets and kept dry with tarps.

Codes and standards named for EV60 are Underwriters Laboratories (US and Canada), UL Evaluation Report ER10128, FM Approvals, State of Florida, Miami-Dade County and Texas Department of Insurance.

Available warranties for EV60 are the 15-, 20- and 25-Year NDL High Wind Warranty (Ultra), the 15-, 20- and 25-Year NDL Warranty (Basic), and the 15- and 20-Year Residential Material Limited Warranty. Supreme is not applicable, and consequential damage coverage is not available for Duro-Last EV installations.