Duro-Last PVC Membrane

Duro-Last PVC Membrane is a reinforced PVC sheet for low-slope commercial roofs in the United States. It is supplied as custom-fabricated sections or as roll goods. The 60 mil version is designated DL60, and 40, 50 and 60 mil products are offered.

It sits in the Duro-Last range of PVC roof membranes. A line of custom-fabricated accessories and parapets is made for use with DL60.

DL60 is PVC film laminated to both sides of a weft-inserted polyester scrim. The DL60 film is a proprietary thermoplastic PVC formulation of resins, plasticizers, stabilizers, biocides, flame retardants and ultraviolet absorbers.

• DL60 film above the scrim: 28 mil, nominal.
• DL60 scrim: an 18 x 14 polyester fabric with weft insertion, with thread treated to prevent wicking.
• Total thickness: 60 mil, nominal.
• Weight: 0.36 lb per square foot.
• R-value: 0.1 R (0.1 ft2·°F·hr/Btu).

DL60 is made in white, tan, gray and dark gray. Custom-fabricated sections are listed under Ordering and Estimating on the Duro-Last website. Roll goods come in these sizes, with coverage figures that assume a 6-inch overlap.

• DL60 roll, 64 in. x 100 ft: roll area 533 ft2, approximately 192 lb, 483 ft2 of coverage.
• DL60 roll, 64 in. x 50 ft: roll area 267 ft2, approximately 97 lb, 241 ft2 of coverage.
• DL60 roll, 32 in. x 100 ft: roll area 267 ft2, approximately 97 lb, 217 ft2 of coverage.
• DL60 roll, 12 in. x 100 ft: roll area 100 ft2, approximately 36 lb (DL60).
• DL60 roll, 8 in. x 100 ft: roll area 67 ft2, approximately 25 lb (DL60).

Custom rolls of up to 64 in. by 240 ft can be produced on request.

Each color has its own Cool Roof Rating Council listing.

• White, ID 0610-0001a: solar reflectance 0.86 initial and 0.69 after three years; thermal emittance 0.89 and 0.89; SRI 108 and 85.
• Tan, ID 0610-0005: solar reflectance 0.39 and 0.33; thermal emittance 0.89 and 0.89; SRI 43 and 35.
• Gray, ID 0610-0004: solar reflectance 0.47 and 0.40; thermal emittance 0.89 and 0.89; SRI 54 and 45.
• Dark gray, ID 0610-0006: solar reflectance 0.26 and 0.25; thermal emittance 0.89 and 0.88; SRI 26 and 23.

Only white DL60 can obtain 1 credit in LEED-NC or LEED-EB, in Sustainable Sites, Heat Island Reduction, at an SRI of 108. White DL60 is used for California Title 24, LEED and other programs requiring a highly reflective roof membrane.

DL60 was tested to ASTM D4434, Standard Specification for Poly (Vinyl Chloride) Sheet Roofing. It is classified as a Type III, internally reinforced sheet with a fabric backing, and meets or exceeds the Type II requirements. Paired values give the machine direction first.

• DL60 overall thickness, ASTM D751: 0.060 in. (60 mil), nominal.
• DL60 thickness over scrim, ASTM D7635: 0.028 in. (28 mil).
• DL60 breaking strength, ASTM D751 grab method: 438 x 390 lbf./in. The requirement is at least 200 lbf./in.
• DL60 elongation, ASTM D751 grab method: 31% x 31%. The requirement is at least 15%.
• DL60 seam strength, ASTM D751 grab method: 431 lbf. The requirement is at least 328 lbf.
• DL60 tear strength, ASTM D751 Procedure B: 132 x 163 lbf. The requirement is at least 45 lbf.
• DL60 low temperature bend, ASTM D2136: pass at -40 °F.
• DL60 heat aging, ASTM D3045: pass after 56 days at 176 °F.
• DL60 accelerated aging, ASTM G155: pass at 10,000 hours total test time.
• DL60 dimensional stability, ASTM D1204: -0.45% x -0.20%. The allowable change is 0.5% or less.
• DL60 water absorption, ASTM D570: 2.6% after 168 hours at 158 °F. The allowable change is 3% or less.
• DL60 static puncture, ASTM D5602, and dynamic puncture, ASTM D5635: both pass.
• DL60 fungi resistance, ASTM G21: no sustained growth or discoloration.
• DL60 moisture vapor transmission, ASTM E96 Procedure B, Method A: less than 0.35 U.S. perms.

Three attachment methods are given for DL60.

• DL60 mechanically fastened: to a range of roof deck and wall materials, with a slip sheet, insulation or cover board where required. Custom-fabricated systems follow the Duro-Last Mechanically Fastened Roofing System Specification, and roll goods follow the Duro-Last Roll Good Mechanically Fastened Roofing System Specification.
• DL60 induction welded: under the Duro-Bond Induction Weld Roofing System Specification.
• DL60 adhered: to properly prepared roof decks, walls, cover boards and insulations, under the Adhered Roofing System Specification.

DL60 rolls are stored lengthwise on pallets and kept dry with tarps.

Codes and standards named for DL60 are Underwriters Laboratories (US and Canada), UL Evaluation Report ER10128, FM Approvals, CCMC 13299-L, State of Florida, Miami-Dade County and Texas Department of Insurance.

Available warranties for DL60 are, in the Supreme category, the 15-Year NDL Warranty and two 20-Year NDL Warranties (15 years consequential damages with 5 years material, or with 5 years material and labor). For DL60, the Ultra category lists the 15-Year NDL Hail, Hail and High Wind, and High Wind warranties plus the 20- and 25-Year NDL High Wind warranties. Basic for DL60 lists the 15-, 20- and 25-Year NDL Warranty, and Residential the 15- and 20-Year Residential Material Limited Warranty. For DL60, the Ultra, Basic and Residential options exclude consequential damage coverage.