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PVC roofing

PVC (polyvinyl chloride) roofing is a single-ply thermoplastic membrane: a sheet reinforced with polyester or fiberglass, with seams fused by hot air. Vinyl is rigid on its own, so plasticizers are added to make the sheet flexible. Manufacturers document its resistance to grease, oils and many chemicals, and Duro-Last lists restaurants and food processing plants among its uses.

Warranty available
Up to 30 years from some manufacturers
Common thicknesses
50, 60 or 80 mil; some lines 40 or 72 mil
Seams
Hot-air welded; some panels factory-welded
Surface
White or colored; white is most reflective
Attachment
Fastened, adhered or ballasted

How it's installed

The deck, the wind design and what sits under the new sheet decide the method. PVC must not touch asphalt, coal tar or polystyrene insulation, so a recover over an old asphalt roof or polystyrene boards needs a separator, such as a board, a plastic sheet or a fleece backing.

Mechanically attached

Plates and screws hold the sheet to the deck along each seam, and the next sheet's overlap is welded over them. In a variant, plates are fastened to the deck first and the sheet is welded to them from above with an induction tool.

Fully adhered

Glued to a cover board, insulation or concrete. Sika's sheet for adhered roofs is reinforced with fiberglass for dimensional stability, and Duro-Last's fleece-backed PVC can be adhered over an aged built-up or modified bitumen roof.

Ballasted

Laid loose, welded, covered with a protection layer, then held down with stone or concrete pavers. Sika's specification calls for at least 10 pounds of stone per square foot, so the structure has to carry the weight.

Prefabricated panels

Duro-Last welds deck sheets sized to the building in its factory, up to 85% of the seams, so fewer welds are made on the roof.

Pros and cons

Where PVC wins

  • Resists animal fats, grease, oils and fuels, which suits restaurant and food processing roofs.
  • Welded seams fuse into one sheet; in Sika's seam test the membrane tears before the seam gives.
  • White sheets reflect 86 to 87% of sunlight when new and about 70% after three years outdoors, per Carlisle and JM data.
  • Flame retardants are built into the compound, and Duro-Last says its PVC is formulated to self-extinguish, which limits fire spread across the roof.

Where it falls short

  • Asphalt, roofing cement and polystyrene draw plasticizers out of PVC, and contact can ruin both materials, so any contact point needs a separator.
  • Its flexibility depends on plasticizers staying in the sheet, and formulations differ: some makers add KEE polymer to hold them in.
  • Repairs need matching material: Duro-Last says its TPO is compatible only with TPO, and its KEE line only with itself.
  • The longest warranties need the thickest sheet: JM lists up to 25 years for its 60 mil PVC and up to 30 for 80 mil.

PVC and hail

Hail ratings and hail warranties apply to the whole assembly, so the board under the PVC matters as well as the sheet. Sika says thicker membranes are better for very severe hail, and its 1.5-inch and 2-inch hail system warranties require a gypsum cover board below the membrane. Hail cover can be a separate warranty with shorter terms: Duro-Last lists 15- and 20-year hail warranties on PVC membranes whose standard terms run to 25 or 30 years.

FM Approvals rates roof assemblies under FM 4470. For moderate (MH) and severe hail (SH) ratings a steel ball is dropped on new and UV-weathered samples; for very severe hail (VSH), 2-inch ice balls are fired at new and weathered or heat-aged samples, and the board under the membrane must not crack. FM Global's Data Sheet 1-34 maps moderate, severe and very severe hail zones and recommends VSH-rated single-ply roofs in the very severe zone. Ask for the FM RoofNav listing of the exact assembly you are quoted.

Compare PVC

  • TPO vs PVC
    TPO vs PVC side by side: both are welded thermoplastics, but PVC resists grease and oils and has to be kept off asphalt. Warranties and when to pick each.

Back to all roof systems

Sources

  1. Duro-Last, Membrane Reference Guide
  2. Carlisle SynTec Systems, Sure-Flex PVC Membrane Product Data Sheet
  3. Sika Corporation, Sarnafil G 410-60 Product Data Sheet
  4. Versico Roofing Systems, Non-Compatible Substrates for PVC
  5. Johns Manville, JM PVC - 60 mil MIN Product Data Sheet (RS-9275)
  6. Johns Manville, JM PVC - 80 mil Product Data Sheet (RS-8923)
  7. Sika Corporation, Sarnafil S 327-72 Product Data Sheet
  8. Duro-Last, Custom Fabricated PVC Membrane Roofing System
  9. Sika Corporation, Roofing Specification: Sarnafil G 410 Ballasted
  10. Carlisle SynTec Systems, Sure-Flex KEE HP Membrane Product Data Sheet
  11. FM Approvals, Class Number 4470: Examination Standard for Single-Ply, Polymer-Modified Bitumen Sheet, Built-Up Roof (BUR) and Liquid Applied Roof Assemblies (April 2022)
  12. Sika Corporation, Sika Sarnafil Hail Performance
  13. Sika Corporation, Roofing Warranty Selection Guide
  14. Professional Roofing (NRCA), Designing for hail resistance

Updated October 2026.