Duro-Fleece Plus PVC Membrane

Duro-Fleece Plus PVC Membrane is a fleece-backed PVC roofing membrane with an 18 x 14 reinforcing scrim, made for low-slope commercial roofs in the United States. The 60 mil version is designated DFP60. Available thicknesses are 50 and 60 mil are available across the product.

The DFP60 membrane is part of the Duro-Last family of PVC roof membranes. Duro-Fleece Plus pairs the 18 x 14 scrim with a 5.5-ounce fleece.

DFP60 is used in adhered and mechanically fastened applications over a range of roof substrates, and a line of custom-fabricated accessories is made for it.

DFP60 places a weft-inserted, knitted polyester scrim between PVC films, with a fleece layer on the underside. The DFP60 film is a proprietary thermoplastic PVC formulation of resins, plasticizers, stabilizers, biocides, flame retardants and ultraviolet absorbers.

• DFP60 film above the scrim: 32 mil, nominal.
• DFP60 scrim: an 18 x 14 polyester fabric with weft insertion, with thread 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: 0.40 lb per square foot. Color: white.
• 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 for hot-air welding to the membrane beneath.

DFP60 is supplied in two roll sizes, ten rolls to a full pallet. Coverage assumes a 3-inch overlap.

• DFP60 roll, 120 in. x 100 ft: approximately 975 ft2 of coverage, 400 lb (DFP60).
• DFP60 roll, 60 in. x 100 ft: approximately 475 ft2 of coverage, 200 lb (DFP60).

The DFP60 factory-applied line 6 inches from one edge of the sheet marks the overlap.

White DFP60 carries Cool Roof Rating Council ID 0610-0017.

• DFP60 solar reflectance: 0.87 initial, 0.69 after three years.
• DFP60 thermal emittance: 0.90 initial, 0.89 after three years.
• DFP60 solar reflective Index: 110 initial, 84 after three years.

White DFP60 alone can obtain 1 credit in LEED-NC or LEED-EB, in Sustainable Sites, Heat Island Reduction, at an SRI of 110. The membrane is used for California Title 24, LEED and other programs requiring a highly reflective roof membrane.

DFP60 was tested to ASTM D4434, Standard Specification for Poly (Vinyl Chloride) Sheet Roofing. It is classified as Type III, internally reinforced, with a fabric backing, and meets or exceeds the Type II and Type IV requirements. Paired values give the machine direction first.

• DFP60 overall thickness, ASTM D751: 0.060 in. (60 mil), nominal; 90 mil with fleece.
• DFP60 thickness over scrim, ASTM D7635: 0.032 in. (32 mil).
• DFP60 breaking strength, ASTM D751 grab method: 546 x 490 lbf./in. The requirement is at least 200 lbf./in.
• DFP60 elongation, ASTM D751 grab method: 20% x 39%. The requirement is at least 15%.
• DFP60 seam strength, ASTM D751 grab method: 539 lbf. The requirement is at least 409 lbf.
• DFP60 tear strength, ASTM D751 Procedure B: 104 x 192 lbf. The requirement is at least 45 lbf.
• DFP60 low temperature bend, ASTM D2136: pass at -40 °F.
• DFP60 heat aging, ASTM D3045: pass after 56 days at 176 °F.
• DFP60 accelerated weathering, ASTM G155: pass at 10,000 hours total test time.
• DFP60 dimensional stability, ASTM D1204: 0.15% x 0.15%. The allowable change is 0.5% or less.
• DFP60 water absorption, ASTM D570: 2.1% after 168 hours at 158 °F. The allowable change is 3% or less.
• DFP60 static puncture, ASTM D5602, and dynamic puncture, ASTM D5635: both pass.
• DFP60 fungi resistance, ASTM G21: no sustained growth or discoloration.
• DFP60 moisture vapor transmission, ASTM E96 Procedure B, Method A: less than 0.35 U.S. perms.

Two attachment methods are given for DFP60.

• DFP60 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, after adhesion pull tests on a 1 x 1-foot area that reach at least 150 pounds per square foot. The Adhered Duro-Fleece Roofing System Specification covers substrate preparation, adhesives and system requirements.
• DFP60 mechanically fastened: to a range of roof deck and wall materials, with a slip sheet, insulation or cover board where required, under the Roll Good Mechanically Fastened Roofing System Specification.

DFP60 rolls are stored lengthwise on pallets and kept dry with tarps.

Codes and standards named for DFP60 are Underwriters Laboratories (US and Canada), UL Evaluation Report ER10128, FM Approvals, CCMC 13695-L, State of Florida, Miami-Dade County and Texas Department of Insurance.

Available warranties for DFP60 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 DFP60, 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 DFP60 lists the 15-, 20- and 25-Year NDL Warranty, and Residential the 15- and 20-Year Residential Material Limited Warranty. For DFP60, the Ultra, Basic and Residential options exclude consequential damage coverage.