Unlike TPO, which is relatively new to the single-ply roofing materials market, PVC membrane is a thermoplastic that has been used for commercial roofing since the 1960s. The physical components of PVC include highly durable, weft-inserted polyester fabric that is encapsulated by thick PVC-based top and bottom plies. This makes PVC resistant to chemicals, grease, fire and punctures. PVC membranes come in 50, 60 and 80 mil. The smooth surface of the PVC membrane allows for a total-surface fusion and permanent weld, creating a consistent watertight flat roof assembly for commercial buildings.
Because of its thermoplastic makeup, minimal components are required for PVC roofing contractors to install a PVC roofing system. Using just an automatic heat welder, makes the welding fast, clean and consistent both for installation and roof repair. Prior to installation, a coverboard and layer of insulation are installed and then the PVC can be attached fully adhered or mechanically fastened.
Fully Adhered PVC System -
As with a TPO or EPDM membrane, the fully adhered option is where the membrane is bonded to the deck’s substrate utilizing PVC bonding adhesive. An adhered system provides the highest level of stability and uplift protection and generally cost more than a mechanically attached PVC roof. Fully adhered systems are preferred in locations with higher winds.
Mechanically Attached PVC System -
A mechanically attached PVC membrane is the most widely used type of installation utilizing fasteners to attach the membrane through the insulation and into the structure’s deck (12” on center) along every seam of the membrane. All seams are hot welded to provide a watertight seal.
Pros of Mechanically Attached PVC: It can be installed at any temperature and at a lower cost.
Best Use for PVC Membrane:
PVC has a proven record of durability over less time tested TPO. Because of it’s resistance to grease, fire and heat, we would recommend PVC on roofs that have exhaust vents and those roofs where ponding may be an issue but are also located in the energy efficient regions of 1- 3. Ideally, PVC membrane roofing provides the best option for restaurants and industrial buildings that produce lots of hot exhaust.
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The following characteristics of a PVC membrane include:
- Superior Resistance to chemicals, grease, fire and animal fat
- Provide a cooling factor to buildings located in warmer regions
- Durable protection proven since the 1960s
- Low thermal conductivity for heat and UV resistance
- Ease of roof repair
All WNC Roofing’s PVC roof installations come with a 20-year manufacturer’s warranty that stands behind the integrity of the product. WNC Roofing adheres to the manufacturer’s installation requirements to maintain the 20-year warranty for all roofs we install.
A post-installation inspection is conducted by the manufacturer following each of WNC Roofing’s projects before a final sign-off for the 20-year warranty is approved. Additionally, WNC Roofing provides a two-year workmanship warranty to cover all installation aspects.