Sarnafil S 327 PVC 80-mil: Chemical-Resistant Roofing for Industrial Facilities
Published: 2026-06-24
Sika Sarnafil S 327 is the reference standard for PVC roofing membranes in chemically aggressive environments: restaurant kitchen exhaust areas, industrial facilities with acid-laden atmospheres, laboratories, and wastewater treatment plants. PVC's chlorinated polymer backbone provides inherent resistance to a wide range of chemicals that would degrade TPO or EPDM — including animal fats, vegetable oils, dilute acids, and alkaline cleaning solutions. The membrane is manufactured with Sika's proprietary lacquer coating on the top surface, which provides additional UV protection and dirt-shedding properties.
Sarnafil PVC has been manufactured since 1962 — it is one of the longest track records in the single-ply roofing industry. This longevity data is critical for specifiers: roofs installed in the 1970s with Sarnafil PVC have been documented to exceed 30 years of service life in European climates, providing the empirical data that newer membrane types cannot yet offer.
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Equivalent Products & Cross-References
| Equivalent / Alternate Product | Action |
|---|---|
| IB Roof PVC 80-mil | |
| FiberTite KEE PVC 80-mil | |
| Duro-Last PVC 60-mil |
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Frequently Asked Questions
Is PVC roofing compatible with polystyrene insulation?
No — this is a critical incompatibility. The plasticizers in flexible PVC roofing membranes will migrate into polystyrene insulation (EPS or XPS), causing the polystyrene to dissolve and the PVC membrane to become brittle. A separator layer must be installed between PVC and any polystyrene insulation: either 1/2-inch gypsum cover board, 1/4-inch DensDeck, or a polyisocyanurate insulation layer. This is not a manufacturer-specific issue — it applies to ALL PVC roofing membranes from every manufacturer. Failed PVC roofs with dissolved polystyrene insulation underneath are one of the most common catastrophic roofing failures in commercial construction.
How long does PVC roofing last compared to TPO?
PVC roofing has a 50+ year track record (first installations 1962, still in service). TPO has approximately 25 years of commercial history (introduced 1990s). Based on current data: PVC = 25-35+ years expected service life. TPO = 20-30 years expected. The key variable is not the polymer but the formulation quality. Premium PVC (Sika Sarnafil) and premium TPO (Carlisle Sure-Weld) both exceed 25 years when properly installed. Economy-grade membranes from both categories have failed within 10-15 years. The single biggest predictor of service life is not the material type — it is the installer's quality control during seam welding.
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References & Industry Standards
- ASTM International. Standard Specifications for Single-Ply Roofing Membranes. astm.org
- FM Approvals. Factory Mutual Roofing Assembly Standards. fmapprovals.com
- UL LLC. Fire Classification of Roofing Materials. ul.com
- NRCA. The NRCA Roofing Manual. nrca.net
PVC Membrane Specifications — Engineering Guide
PVC (Polyvinyl Chloride) roofing membranes offer superior chemical resistance compared to TPO and EPDM — critical for restaurants, factories, and facilities with grease or chemical exhaust. PVC formulations include plasticizers that maintain flexibility at low temperatures and flame retardants that provide inherent fire resistance.
ASTM D4434 (PVC Spec), FM 4470, UL 790, ASTM E108, NSF/ANSI 347 (Sustainability)
PVC membranes must be protected from direct contact with polystyrene insulation — the plasticizers in PVC will chemically attack and dissolve polystyrene foam. Always use a separation layer (polyisocyanurate or gypsum cover board) between PVC and any polystyrene insulation.