Thermal Polyolefin / Single-Ply

Thermal Polyolefin, more commonly known as TPO, is a roofing option that is made up of a single layer of synthetic material and scrim that is reinforced, which can be used for flat roofs. It is worth noting that TPO is emerging in popularity as a commercial roofing option.TPO sheets are anywhere from 10 to 30 feet wide and come rolled up from the manufacturer.

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Installation Process


Once the existing roof substrate is prepared by either removing the old roofing material or cleaning, the insulation is then installed, we use a Polyisocyanurate (Polyiso) cover board which is the most commonly used option, and provides a high R-value insulation rating.


The TPO membrane is then attached to the polyiso cover board by either a bonding adhesive or by mechanically fastening it.


Once the TPO membrane is rolled out, a hot-air gun is used to weld the seams together.

Pros and Cons of Spray Polyurethane Foam Roofing


  • Save money due to its reflective properties which reflect UV rays and heat from buildings, which helps decrease energy usage.
  • Has a class A fire-rating; the fire resistance comes from the spraying of fire retardant chemicals during the manufacturing process.


  • Still a relatively new roofing option as it has only been around since the 90s so the formula itself is still being refined by manufacturers being that there is still a risk of seams, cracks, or leaks due to extreme heat.
  • The lifespan of the TPO is not specified but it can range from 10-20 years, similar to asphalt roof shingles.