Duro-Fleece PVC Membrane

Duro-Fleece PVC Membrane is a PVC roofing membrane with fleece laminated to the underside, for low-slope commercial roofs in the United States. The 60 mil version is designated DF60. Standard rolls are 5 and 10 feet wide.

The DF60 membrane is part of the Duro-Last family of PVC roof membranes. DF60 uses an 18 x 9 scrim and a 3.8-ounce fleece, where Duro-Fleece Plus uses an 18 x 14 scrim.

The membrane is used in adhered and mechanically fastened applications over a range of roof substrates. Custom-fabricated accessories are made to go with DF60.

DF60 holds a weft-inserted, knitted polyester scrim inside PVC films, with a fleece layer on the underside. The DF60 film is a proprietary thermoplastic PVC formulation of resins, plasticizers, stabilizers, biocides, flame retardants and ultraviolet absorbers.

• DF60 film above the scrim: 31 mil, nominal.
• DF60 scrim: an 18 x 9 polyester fabric with weft insertion, with thread treated to prevent wicking.
• Fleece: 3.8-ounce per square yard needle-punched polypropylene.
• Total membrane thickness: 60 mil, nominal. Thickness including the fleece: 78 mil, nominal.
• Weight: 0.39 lb per square foot. Color: white.
• R-value: 0.1 R (0.1 ft2·°F·hr/Btu).

One selvage edge on each roll has the fleece held back 2.25 inches for hot-air welding to the membrane beneath.

The membrane is made in three nominal thicknesses, each with its own product data sheet and color-specific sheets.

• 50 mil: 26 mil of PVC above the scrim, 68 mil overall with fleece, 0.33 lb per square foot.
• 60 mil: 31 mil of PVC above the scrim, 78 mil overall with fleece, 0.39 lb per square foot.
• 80 mil: 41 mil of PVC above the scrim, 98 mil overall with fleece, 0.53 lb per square foot.

The scrim is a weft-inserted, anti-wicking woven fabric at 18 x 9 threads per inch. The PVC layer above the scrim is exposed to weather and foot traffic, and the surface is smooth once adhered or fastened.

• 50 mil: 5 ft x 100 ft and 10 ft x 100 ft.
• 60 mil: 5 ft x 100 ft and 10 ft x 100 ft.
• 80 mil: 5 ft x 65 ft and 10 ft x 65 ft.

Twelve colors are listed: White, light gray, patina, light tan, charcoal, green, copper, blue, bright red, colonial red, midnight bronze and brown.

Published qualitative properties are flexibility, reflectivity, ultraviolet resistance, flame retardance and resistance to a broad range of chemicals. The fleece and woven scrim add puncture protection.

The membrane is adhered directly over structural concrete, gypsum (poured-in-place or precast), aged built-up roofing and lightweight concrete (insulating or cellular). It is mechanically fastened over existing asphalt roofing systems.

Custom-fabricated accessories are made for transitions. Related components include insulation, cover boards, vapor barrier, flashings, fasteners, adhesives including Duro-Bond, skylights, pipe stands, lineal edge metal and drainage. The specifications are the Duro-Last Mechanically Fastened Roofing System and the Adhered Duro-Fleece Roofing System.

The membrane is NSF/ANSI 347 Gold certified, UL approved and FM approved. Warranty options range from 15-year to 30-year NDL (no dollar limit), plus 15-year and 20-year NDL High Wind.

DF60 is supplied in two roll sizes, ten rolls to a full pallet. Coverage assumes a 3-inch overlap.

• DF60 roll, 120 in. x 100 ft: approximately 975 ft2 of coverage, 390 lb (DF60).
• DF60 roll, 60 in. x 100 ft: approximately 475 ft2 of coverage, 195 lb (DF60).

The DF60 factory-applied line 6 inches from one edge of the sheet marks the overlap.

White DF60 carries Cool Roof Rating Council ID 0610-0010.

• DF60 solar reflectance: 0.87 initial, 0.67 after three years.
• DF60 thermal emittance: 0.89 initial and 0.89 after three years.
• DF60 solar reflective Index: 110 initial, 81 after three years.

White DF60 alone can obtain 1 credit in LEED-NC or LEED-EB, in Sustainable Sites, Heat Island Reduction, at an SRI of 110. On DF60, use is for California Title 24, LEED and other programs requiring a highly reflective roof membrane.

DF60 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 requirements. Paired values give the machine direction first.

• DF60 overall thickness, ASTM D751: 0.060 in. (60 mil), nominal; 78 mil with fleece.
• DF60 thickness over scrim, ASTM D7635: 0.031 in. (31 mil).
• DF60 breaking strength, ASTM D751 grab method: 554 x 408 lbf./in. The requirement is at least 200 lbf./in.
• DF60 elongation, ASTM D751 grab method: 34% x 85%. The requirement is at least 15%.
• DF60 seam strength, ASTM D751 grab method: 437 lbf. The requirement is at least 415 lbf.
• DF60 tear strength, ASTM D751 Procedure B: 50 x 200 lbf. The requirement is at least 45 lbf.
• DF60 low temperature bend, ASTM D2136: pass at -40 °F.
• DF60 heat aging, ASTM D3045: pass after 56 days at 176 °F.
• DF60 accelerated weathering, ASTM G155: pass at 10,000 hours total test time.
• DF60 dimensional stability, ASTM D1204: 0.10% x 0.00%. The allowable change is 0.5% or less.
• DF60 water absorption, ASTM D570: 2.3% after 168 hours at 158 °F. The allowable change is 3% or less.
• DF60 static puncture, ASTM D5602, and dynamic puncture, ASTM D5635: both pass.
• DF60 fungi resistance, ASTM G21: no sustained growth or discoloration.
• DF60 moisture vapor transmission, ASTM E96 Procedure B, Method A: less than 0.35 U.S. perms.

Two attachment methods are given for DF60.

• DF60 adhered: to a range of roof decks, walls, cover boards and insulations, or directly to an existing built-up roof (BUR) with approved membrane adhesives after adhesion pull tests on a 1 x 1-foot area reach at least 150 pounds per square foot. The Adhered Duro-Fleece Roofing System Specification covers substrate preparation, adhesives and system requirements.
• DF60 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.

DF60 rolls are stored lengthwise on pallets and kept dry with tarps.

Codes and standards named for DF60 are Underwriters Laboratories (US and Canada), UL Evaluation Report ER10128, FM Approvals, CCMC 14011-L, State of Florida, Miami-Dade County and Texas Department of Insurance.

Available warranties for DF60 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-Fleece installations.