How long does a flat or membrane roof last?
A flat or membrane roof typically lasts 15 to 25 years. Where yours falls in that range depends on how it was installed, how hard it works and how well it's maintained.
When will yours need replacing?
Enter the install year to see when replacement is due.
Opens the free calculator with this item filled in.
What affects its lifespan
- Membrane type (TPO, EPDM, modified bitumen, built-up)
- Ponding water from poor drainage
- Foot traffic from rooftop equipment service
- UV exposure and seam quality
Signs it's near the end
- Blisters, splits or open seams
- Standing water days after rain
- Leaks that return after patching
- Wet or compressed insulation underneath
Questions
- How long does a flat or membrane roof last?
- Typically 15 to 25 years. CapexClock uses 20 years as its default, and you can change it for your building.
- When should I start saving to replace a flat or membrane roof?
- As soon as it's installed. Spreading the cost over its 15–25 year life keeps the replacement from landing as a surprise. The mini calculator on this page shows a monthly amount for yours.
- How is a flat or membrane roof priced in the calculator?
- By default it's priced per building. Enter your own quote or recent invoice; CapexClock never fills in costs for you.
Plan every replacement in your building
List your roof, HVAC, water heaters and more to get a 10-year forecast and one monthly reserve number.
Open the free CapEx calculatorOther roofing lifespans
- Asphalt shingle roof 20–25 years
- Gutters and downspouts 20–30 years