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.
🛡️ Roof Insurance Claim Process (Step-by-Step)
- Document the Damage — Take photos/video of all damage from multiple angles before any tarps or temporary repairs. Include close-ups of impact marks, granule loss, and membrane punctures.
- Prevent Further Damage — Install emergency tarp or temporary seal. Most policies require you to mitigate further damage. Keep receipts for emergency repairs — they are reimbursable.
- File the Claim Promptly — Contact your insurance carrier within 24-72 hours. Provide: date of loss, type of damage (wind/hail/other), photos, and a rough estimate if available.
- Schedule Adjuster Inspection — The carrier sends a claims adjuster. Have your roofing contractor present during inspection — they can point out damage the adjuster might miss, especially on membrane seams and flashings.
- Get Contractor Estimates — Obtain 2-3 estimates from licensed roofing contractors who work with insurance claims. Ensure estimates use Xactimate pricing (industry-standard insurance estimating software).
- Review the Adjuster Report — Compare the adjuster's scope of work with your contractor's estimate. Common disputes: matching undamaged adjacent slopes, code upgrades (building code may require upgrades the adjuster didn't include), and overhead & profit calculation.
- Negotiate if Necessary — If the adjuster's estimate is lower than your contractor's, submit a "supplement" with additional documentation. You have the right to use a public adjuster (typically 10% of claim) if negotiations stall.
- Approve and Schedule — Once you agree on scope and price, the carrier issues an Actual Cash Value (ACV) payment. After replacement, submit the final invoice for the Recoverable Depreciation (RCV - ACV = depreciation held back until work is complete).
📅 Roofing Season Calendar by Region
Plan your roofing project for optimal weather windows. Off-season installs may require special procedures and cost 10-20% more.
| City | Climate Zone | Roofing Season |
|---|---|---|
| Dallas TX | 2A (Hot-Humid) | March-November (peak: April-June, September-October) |
| San Antonio TX | 2A (Hot-Humid) | March-November (peak: April-June, September-October) |
| Houston TX | 2A (Hot-Humid) | Year-round (avoid peak hurricane season June-November for major projects) |
| Chicago IL | 5A (Cold-Humid) | April-October (peak: June-August). Winter installs require special adhesive and heat sources. |
| Phoenix AZ | 1B (Very Hot-Dry) | Year-round (avoid July-August peak heat for worker safety). Peak season: October-April. |
| Denver CO | 4B (Mixed-Dry) | April-October (peak: June-August). Hail damage repairs spike June-July. |
| Atlanta GA | 3A (Warm-Humid) | March-November (peak: May-July, September-October) |
Need a roofer you can trust? Spec sheets tell you what to buy. A pro tells you what it costs installed — in your city, with your building's specific requirements. See real quotes from local contractors who know this material.
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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 |
🏗️ Roofing Yield & Cost Estimator
Calculate total squares needed and estimated material cost for your commercial roofing project. All calculations run locally in your browser.
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.