The TPO thermoplastic polyolefin Single Ply Roof System
TPO is a single-ply roof system, as opposed to a built-up roof system having several layers of roofing materials. TPO and other single-ply systems have one roof membrane.
The system components
These components not installed in every TPO System
- The deck
- Air barrier when specified for the system
- Thermal barrier when specified for the system
- Vapor retarded when specified for the system
- Insulation (see "roof insulation'' )
- Cover board
- Adhesive or Fasteners (depending on the system)
- TPO membrane
- TPO flashing
How will the system be installed
TPO systems include;
- Fully adhered - glued to the substrate
- Mechanically fastened - nailed to the substrate
- Ballasted - loosely laid over the substrate and held in place by rock, pavers or some other ballast material.
The seems, flashing, and edging is heat welded to form a single membrane.
Service life expectancy
Industry experts predict a TPO service life somewhere between 20 and 30 years.
The most common problems
TPO is still a relatively new player in the market, and the industry is learning more about its performance as time goes on. Some of the problems are:
- Improper installation
- Loose seams and flashing
- UV degradation to the scrim allow water intrusion
- Since this a single-ply system, any puncture is a leak
Roof Consultant and Roof Industry Advocate