Duro-Tuff PVC Membrane

Duro-Tuff PVC Membrane is a reinforced PVC roof membrane supplied as roll goods, with separate custom-fabricated accessories, for low-slope commercial roofs in the United States. The 60 mil version is designated DT60. Other thicknesses and colored variants have their own data sheets.

It is part of the Duro-Last single-ply range, alongside the other PVC roof membranes.

DT60 places a weft-inserted, knitted polyester scrim between PVC films. The DT60 film is a proprietary thermoplastic PVC formulation of resins, plasticizers, stabilizers, biocides, flame retardants and ultraviolet absorbers.

• DT60 film above the scrim: 31 mil, nominal.
• DT60 scrim: an 18 x 9 polyester fabric with weft insertion, with thread treated to prevent wicking.
• Total thickness: 60 mil, nominal.
• Weight: 0.35 lb per square foot.
• Color: white on the top surface, light gray on the bottom surface.
• R-value: 0.1 R (0.1 ft2·°F·hr/Btu).

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

• 50 mil: 26 mil of PVC film above the scrim, 0.28 lb per square foot.
• 60 mil: 31 mil of PVC film above the scrim, 0.35 lb per square foot.
• 80 mil: 41 mil of PVC film above the scrim, 0.51 lb per square foot.

The scrim is a weft-inserted, anti-wicking woven fabric at 18 x 9 threads per inch. The top PVC layer is the surface exposed to weather and chemicals, and the installed surface is smooth.

• 50 mil and 60 mil: 10 in., 30 in., 5 ft and 10 ft wide, each 100 ft long.
• 80 mil: 10 in., 30 in., 5 ft and 10 ft wide, each 65 ft long.

Twelve colors are listed: White (with a gray bottom surface), light gray, patina, light tan, charcoal, green, copper, blue, bright red, colonial red, midnight bronze and brown. The white membrane has a gray bottom surface. Most colors are offered at 60 mil.

Published qualitative properties are flexibility, reflectivity, ultraviolet resistance, flame retardance and resistance to a broad range of chemicals.

A full line of custom-fabricated accessories is made for transition areas. Related Duro-Last components include lineal edge metal, drains, flashings, fasteners, adhesives, insulation, cover board, vapor barrier and skylights.

The attachment methods have published specifications: the mechanically fastened roofing system, the adhered roofing systems and the Duro-Bond induction weld 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), including High Wind NDL.

DT60 comes in four roll sizes, ten rolls to a full pallet. Coverage for DT60 assumes a 6-inch overlap and Duro-Last Poly or Cleat Plates.

• DT60 roll, 120 in. x 100 ft: approximately 950 ft2 of coverage, 350 lb (DT60).
• DT60 roll, 60 in. x 100 ft: approximately 450 ft2 of coverage, 175 lb (DT60).
• DT60 roll, 30 in. x 100 ft: approximately 200 ft2 of coverage, 88 lb (DT60).
• DT60 roll, 10 in. x 100 ft: a stripping width, 29 lb (DT60).

A DT60 factory line 6 inches from one edge of the sheet marks the overlap. On DT60, marks in the form of an X at 6-inch intervals along one edge space the fasteners, with the seam plate edge flush with the sheet edge.

A rounded-corner patch at least 4 x 4 inches, or 4 inches in diameter, is required at every T-lap where three or more layers meet. The patch can be made of Duro-Tuff or Duro-Last membrane of any thickness, and Detail Drawing RG1066 applies.

White DT60 carries Cool Roof Rating Council ID 0610-0008.

• DT60 solar reflectance: 0.86 initial, 0.74 after three years.
• DT60 thermal emittance: 0.87 initial and 0.87 after three years.
• DT60 solar reflective Index: 108 initial, 91 after three years.

White DT60 alone can obtain 1 credit in LEED-NC or LEED-EB, in Sustainable Sites, Heat Island Reduction, at an SRI of 108. On DT60, use is for California Title 24, LEED and other programs requiring a highly reflective roof membrane.

DT60 was tested to ASTM D4434, Standard Specification for Poly (Vinyl Chloride) Sheet Roofing. It is classified as a Type III, internally reinforced sheet and meets or exceeds the Type II requirements. Paired values give the machine direction first.

• DT60 overall thickness, ASTM D751: 0.060 in. (60 mil), nominal.
• DT60 thickness over scrim, ASTM D7635: 0.031 in. (31 mil).
• DT60 breaking strength, ASTM D751 grab method: 437 x 304 lbf./in. The requirement is at least 200 lbf./in.
• DT60 elongation, ASTM D751 grab method: 29% x 30%. The requirement is at least 15%.
• DT60 seam strength, ASTM D751 grab method: 463 lbf. The requirement is at least 327 lbf.
• DT60 tear strength, ASTM D751 Procedure B: 78 x 190 lbf. The requirement is at least 45 lbf.
• DT60 low temperature bend, ASTM D2136: pass at -40 °F.
• DT60 heat aging, ASTM D3045: pass after 56 days at 176 °F.
• DT60 accelerated weathering, ASTM G155: pass at 10,000 hours total test time.
• DT60 dimensional stability, ASTM D1204: 0.30% x 0.10%. The allowable change is 0.5% or less.
• DT60 water absorption, ASTM D570: 2.29% after 168 hours at 158 °F. The allowable change is 3% or less.
• DT60 static puncture, ASTM D5602, and dynamic puncture, ASTM D5635: both pass.
• DT60 fungi resistance, ASTM G21: no sustained growth or discoloration.
• DT60 moisture vapor transmission, ASTM E96 Procedure B, Method A: less than 0.35 U.S. perms.

Three attachment methods are given for DT60.

• DT60 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 System Specification.
• DT60 induction welded: under the Duro-Bond Induction Weld Roofing System Specification.
• DT60 adhered: to properly prepared roof decks, walls, cover boards and insulations, under the Adhered Roofing System Specification.

DT60 rolls are stored lengthwise on pallets and kept dry with tarps.

Codes and standards named for DT60 are Underwriters Laboratories (US and Canada), UL Evaluation Report ER10128, FM Approvals, CCMC 14012-L, State of Florida, Miami-Dade County and Texas Department of Insurance.

Available warranties for DT60 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-Tuff installations.