Why TPO is winning commercial flat-roof replacement
60-mil TPO costs 30% more upfront than built-up roofing — and the operating performance is documented across our commercial portfolio. Here is the spec, the installation, and what to put on your next commercial re-roof.
60-mil TPO costs more upfront than built-up roofing and carries a materially longer service life. Here is the spec math, the lifecycle comparison, and what to put on your next commercial re-roof.
Why TPO, why now
TPO (thermoplastic polyolefin) single-ply membrane has been the fastest-growing commercial flat-roof product in California for a decade. It reflects a high share of solar radiation, holds a NDL , and is mechanically fastened or fully adhered.
The math
Built-up roofing (BUR): $4.50/sf installed. 60-mil TPO: $5.85/sf installed. Across the life of the assembly, BUR reaches $9.38/sf once you count the second tear-off and its labor, while TPO stays at $5.85/sf. The up-front delta is smaller than the lifecycle delta.
The spec
60-mil minimum thickness (not 45-mil). White reflective. Mechanically fastened for re-roof over existing, fully adhered for new construction. NDL from the manufacturer.
When not to use TPO
If the roof sees heavy foot traffic or mechanical equipment, go PVC or modified bitumen. TPO is great for warehouse, retail, office, and low-traffic flat roofs.