Duro-Last EV Fleece PVC Membrane

Duro-Last EV Fleece PVC Membrane is a reinforced PVC roofing membrane with a fleece backing, made for low-slope commercial roofs in the United States. The 60 mil version is designated EVF60. Available thicknesses are 60 and 80 mil are available across the product.

The membrane belongs to the Duro-Last family of PVC roof membranes. It is the fleece-backed member of the Duro-Last EV line, whose films contain DuPont Elvaloy KEE (Ketone Ethylene Ester).

EVF60 is used in adhered and mechanically fastened systems over a range of substrates. Custom-fabricated accessories are made to go with EVF60.

The membrane is built from KEE-containing thermoplastic films around a weft-inserted, knitted polyester scrim. The film formulation combines resins, plasticizers, stabilizers, biocides, flame retardants and ultraviolet absorbers.

• EVF60 film above the scrim: 28 mil, nominal.
• EVF60 scrim: an 18 x 9 polyester fabric with weft insertion. The polyester thread is treated to prevent wicking.
• Fleece: 5.5-ounce per square yard needle-punched polypropylene.
• Total membrane thickness: 60 mil, nominal. Thickness including the fleece: 90 mil, nominal.
• Weight: 0.39 lb per square foot.
• R-value: 0.1 R (0.1 ft2·°F·hr/Btu).

Each roll has one selvage edge where the fleece is held back 2.25 inches, leaving a strip of bare membrane for hot-air welding to the membrane beneath.

EVF60 is white on both the top and the bottom surface. It is supplied in two roll sizes, and a full pallet holds 10 rolls.

• EVF60 roll Item 661489: 120 in. x 100 ft, approximately 975 ft2 of coverage, approximately 390 lb.
• EVF60 roll Item 661488: 60 in. x 100 ft, approximately 475 ft2 of coverage, approximately 195 lb.

Coverage figures assume a 3-inch overlap. A line is applied at the factory 6 inches from one edge of the sheet to mark the overlap. On EVF60, marks in the form of an X are printed at 6-inch intervals along one edge to space the fasteners, and the outside edge of each seam plate is installed flush with the edge of the sheet.

A rounded-corner patch is required wherever three or more layers of membrane meet, which is called a T-lap. The minimum patch is 4 x 4 inches or 4 inches in diameter, and it can be cut from EV membrane of any thickness.

The white membrane carries Cool Roof Rating Council ID 0610-0011.

• EVF60 solar reflectance: 0.86 initial, 0.71 after three years.
• EVF60 thermal emittance: 0.89 initial, 0.88 after three years.
• EVF60 solar reflective Index: 108 initial, 87 after three years.

The white membrane is used where California Title 24, LEED and other programs call for a highly reflective roof membrane. White EVF60 alone can obtain 1 credit in either the LEED-NC or LEED-EB program, under Sustainable Sites, Heat Island Reduction, with an SRI of 108.

EVF60 was tested to ASTM D4434, Standard Specification for Poly (Vinyl Chloride) Sheet Roofing. It is classified as a Type III, internally reinforced sheet and also meets or exceeds the ASTM D4434 Type II requirements. Where two values appear below, the machine direction is first and the cross machine direction second.

• EVF60 overall thickness, ASTM D751: 0.060 in. (60 mil), nominal. The requirement is 54 to 66 mil.
• EVF60 thickness over scrim, ASTM D7635: 0.028 in. (28 mil). The requirement is at least 0.016 in.
• EVF60 breaking strength, ASTM D751 grab method: 618 x 417 lbf./in. The requirement is at least 200 lbf./in.
• EVF60 elongation, ASTM D751 grab method: 34% x 29%. The requirement is at least 15%.
• EVF60 seam strength, ASTM D751 grab method: 313 lbf. The requirement is at least 313 lbf., which is 75% of breaking strength.
• EVF60 tear strength, ASTM D751 Procedure B: 82 x 122 lbf. The requirement is at least 45 lbf.
• EVF60 low temperature bend, ASTM D2136: pass at -40 °F.
• EVF60 heat aging, ASTM D3045: pass after 56 days in an oven at 176 °F.
• EVF60 accelerated weathering, ASTM G155: pass at 10,000 hours total test time, irradiance 0.35 W/m2 at 340 nm, cycle of 102 minutes light and 18 minutes light with water spray, 63 ± 2.5 °C black panel, 30 ± 5% relative humidity.
• EVF60 dimensional stability, ASTM D1204: 0.00% x 0.00% after 6 hours at 176 °F. The allowable change is 0.5% or less.
• EVF60 water absorption, ASTM D570: pass after 168 hours immersed at 158 °F. The allowable weight change is 3% or less.
• EVF60 static puncture, ASTM D5602: pass. The requirement is at least 33 lbf.
• EVF60 dynamic puncture, ASTM D5635: pass. The requirement is at least 14.7 ft-lbf. (20 J).

Fungi resistance (ASTM G21) and moisture vapor transmission (ASTM E96, Procedure B, Method A) are listed as pending.

Two attachment methods are given for EVF60.

• EVF60 adhered: the membrane can be adhered to a range of roof decks, walls, cover boards and insulations. It can be adhered directly to an existing built-up roof (BUR) with approved membrane adhesives. Adhesion pull tests are required first, on a 1 x 1-foot area, and must reach minimum values of 150 pounds per square foot. Substrate preparation and adhesives are set out in the Adhered Duro-Fleece Roofing System Specification.
• EVF60 mechanically fastened: the membrane can be fastened to a range of roof deck and wall materials. A slip sheet, insulation or cover board may be required. System requirements are in the Duro-Last Roll Good Mechanically Fastened Roofing System Specification.

Rolls are stored lengthwise on pallets, with tarps used to keep them dry.

The codes and standards named for EVF60 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 projects using EVF60 are the 15-, 20- and 25-Year NDL High Wind Warranty in the Ultra category, the 15-, 20- and 25-Year NDL Warranty in the Basic category, and the 15- and 20-Year Residential Material Limited Warranty. The Supreme category is not applicable to this product, and consequential damage coverage is not available for Duro-Last EV installations. The 25-year options carry additional installation criteria in the 25 and 30-Year Warranty Requirements.