Realistic service life for Houston commercial roofs, assuming competent installation:
– **TPO:** 20 to 30 years
– **PVC:** 20 to 30 years, with better chemical resistance
– **EPDM:** 20 to 25 years, though heat absorption works against it here
– **Modified bitumen:** 15 to 20 years
– **Built-up roof (BUR):** 20 to 30 years
– **Acrylic or elastomeric coating over a sound substrate:** adds 10 to 15 years
Where a given roof lands within its range comes down to four things:
– **Slope and drainage.** Ponding is the single largest predictor of early failure.
– **Foot traffic.** HVAC servicing without walkway pads causes membrane damage in predictable paths.
– **Maintenance frequency.** Semi-annual drain clearing and seam inspection routinely adds years.
– **Installation quality at the details** — curbs, penetrations, terminations. Field membrane rarely fails first; details do.
The most cost-effective thing a Houston building owner can do is **clear the drains twice a year and inspect after major storms.** It’s inexpensive and it’s the difference between a 30-year roof and a 15-year one.
Get a documented condition assessment at year 12 to 15 so replacement becomes a budgeted capital item rather than an emergency.