In Quebec, a tar and gravel flat roof lasts about 15 to 25 years, elastomeric 25 to 40 years, and TPO or EPDM 15 to 35 years. Installation quality, slope to the drains and yearly maintenance often matter more than the material itself.
Signs your flat roof is near the end
- Cracks, crazing or blisters in the membrane
- Surface granules disappearing on elastomeric
- Puddles lasting more than 48 hours after rain
- Flashing lifting in several places
- Repeated leaks despite repairs
- Stained ceilings on the top floor
How to make it last
- Yearly inspection, ideally in fall. See our pre-winter checklist.
- Keep drains clear, especially during leaf season and freezes.
- Fix small issues fast: a resealed flashing prevents costly leaks.
- Careful snow removal when needed. See should you clear snow from a flat roof?
When your membrane passes two-thirds of its lifespan, start budgeting with our cost guide.
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Indicative lifespans based on Quebec ranges. Installation, slope and maintenance can change them a lot.