How PVC roofing works
PVC is a thermoplastic membrane — it softens when heated and can be welded to itself using hot air. This heat-welding capability is its most important feature: properly welded PVC seams are stronger than the membrane itself, creating a monolithic waterproof surface that doesn't rely on adhesives that can fail over time. PVC is installed in sheets over insulation boards, either fully adhered, mechanically fastened, or ballasted.
PVC vs TPO — the main comparison
Both PVC and TPO are white thermoplastic membranes that are heat-welded and Energy Star rated. The differences are:
| Factor | PVC | TPO |
|---|---|---|
| Chemical resistance | Excellent — resists grease, oils, chemicals | Moderate |
| Flexibility at cold temps | Good (plasticizer-dependent) | Good |
| Track record | 60+ years | ~30 years |
| Cost | Slightly higher than TPO | Standard baseline |
| Best for | Restaurants, industrial, chemical exposure | Most standard commercial buildings |
When PVC is the right choice
Restaurants and food service: Grease exhaust from kitchen hoods is the primary use case. Grease degrades TPO and EPDM over time; PVC is highly resistant. Any building with significant kitchen exhaust should have PVC — not TPO — under or near exhaust equipment.
Industrial and manufacturing: Chemical exposure, fuel, or solvent vapors that might contact the roof surface are better handled by PVC.
Long track record priority: PVC has been in commercial service since the 1960s. Its long-term performance data under various conditions is extensive. For building owners who prioritize proven materials, PVC's track record is longer than TPO's.
For standard office, retail, and warehouse buildings: TPO is typically the cost-effective first choice. PVC is worth specifying when chemical or grease exposure is a factor, or when the longer track record is a priority. Atlas Roofing installs both — we'll recommend the right system for your building at a free assessment.