Why is TPO Used For Commercial Roofing?

Thermoplastic Polyolefin is a single-ply roofing membrane that is one of the fastest-growing commercial roofing systems on the market. TPO roofing systems are a single layer of synthetics and reinforcing scrim used to cover flat roofs.

TPO membranes are manufactured in sheets 10, 12, or 20 feet wide. These sheets are then rolled up and taken to the commercial facility.

TPO has gained industry acceptance with its naturally reflective surface to reflect UV rays. The National Roofing Contractors Association (NRCA) reported that TPO takes up about 40% of the commercial roofing market share.

TPO Roofing Installation

After the existing substrate is prepared, either by cleaning or removing the existing roof, the insulation is installed. There are a few types of insulation options the facility manager/owner can choose from:

• Polyisocyanurate (Polyiso) – The most used insulation type for roofing applications, Polyiso is more expensive but pays off with a higher R-value rating.

• Expanded Polystyrene (EPS) – With the highest R-value per dollar, EPS is used for roof, wall, and floor insulation. EPS can be used for ground contact and does not retain water over time.

• Extruded Polystyrene (XPS) – Usually defined by the blue, green, or pink color, XPS falls between Polyiso and EPS in the price range and performance range. XPS is semipermeable with a perm rating of 1.

The TPO membrane can be attached to the cover board with a bonding adhesive or mechanically fastened. When the membrane is rolled out, the contractor returns and uses a hot-air gun to weld the seams together.