Thermoplastic Olefin (TPO) membranes are produced by calendering with lamination, extrusion with lamination, or extrusion-coating techniques. TPO sheets are a blend of polypropylene and ethylene propylene polymers and usually are reinforced with polyester. TPO sheets contain colorant, flame retardants, UV absorbers and other proprietary substances to achieve desired physical properties. The sheet widths range from 6 feet to 12 feet wide and are typically 40 mils to 100 mils thick. The seams are sealed by heat welding with hot air. TPO membranes are available in white, light gray, and black.
Application of the TPO membrane to the insulation board using bonding adhesive.
Benefits of TPO roofs include:
- Excellent resistance to ozone
- Algae resistant
- Environmentally friendly and safe to install
- Highly resistant to tearing
- Flexibility allows for building movement