TPO Roofing: Everything You Need To Know

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. They are then rolled up and taken to the commercial facility.

TPO has gained industry acceptance because of its naturally reflective surface, which reflects UV rays. The National Roofing Contractors Association (NRCA) reported that TPO has about 40% of the commercial roofing market share.

Advantages of TPO Roofing

A commercial single-ply membrane roof can last 30 years if properly installed and maintained. There are quite a few other benefits of single-ply membrane roofing systems:

  • Customer Choice of Insulation—Since single-ply does not include the insulation factor, customers have more options to insulate their facility’s roof.
  • Class A Fire-Rated – TPO membranes and EPDM can achieve Underwriters Laboratories (UL) Class A fire resistance listings by adding fire retardant chemicals during manufacturing.
  • Reflective or Retentive – TPO is generally white and highly reflective. On the other side of the spectrum, EPDM is often described as “Black Roofs” due to the naturally dark color of the membrane.

How is a TPO roof repaired?

A TPO will last approximately 15-20 years. During this time, seams can rip apart, flashings can fail, the membrane can become punctured, etc., which will cause a roof leak.

Water entering the building is the first sign of a TPO roof needing repair. This usually happens when seams lose adhesion, allowing water to enter the roofing insulation.

Once the insulation accrues so much water, it enters your roofing deck and eventually starts leaking inside your building.

At this stage, it’s time to call a commercial roofing contractor to perform a roofing inspection.

During the inspection, a roofing contractor will be able to tell:

  • Where water is coming through the membrane
  • How much of the insulation is wet
  • How old is the TPO roof
  • How many layers does the roof have
  • What condition are the seams in

What comes out of this conversation is the building owner’s repair options. Say the roof is 12 years old, and the seams are slightly uplifted, like this:

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