Service life and upkeep
How Long a Roof Lasts: Service Life by Covering Material
A roof's service life is set by its shortest-lived component rather than by its covering, which is why roofs are replaced decades before the material on top of them has worn out. Search the roof and the terms around it, then book a survey to check the condition on site. Roofs are replaced when fixings, battens or underlay expire, all of which fail earlier than the material on top.
A roof reaches the end of its life when its shortest-lived component does, which is why roofs are replaced decades before the material on top of them has worn out.
| Covering | Service life |
|---|---|
| Natural slate | over 100 years |
| Clay tile | around 80 years |
| Concrete tile | 50 to 60 years |
| GRP fibreglass | 25 to 40 years |
| EPDM rubber | 20 to 30 years, to 50 where well laid |
| Torch-on felt | 10 to 20 years |
What expires first underneath it
- Iron nail
- 60 to 100 years, shorter than the slate it holds.
- Batten
- Shorter than the covering, and not replaceable without stripping it.
- Bitumen sarking
- Shorter than any covering laid over it.
- Mortar bedding
- Degrades over decades and releases ridge units.
Natural slate — over 100 years. Clay tile — around 80 years. Concrete tile — 50 to 60 years. GRP fibreglass — 25 to 40 years. EPDM rubber — 20 to 30 years, to 50 where well laid. Torch-on felt — 10 to 20 years.
A north-facing, exposed or tree-shaded slope reaches the end of its life measurably before a sheltered one on the same house, so every figure above is shortened by aspect.
4 related pages cover this in more depth: Repair or Replace, signs you need a new roof, slate or tile roof and birds nesting in roof.
How long does each roof covering last?
Natural slate lasts over a hundred years, clay tile around eighty, and concrete tile fifty to sixty. Among flat systems, fibreglass reaches twenty-five to forty years, rubber twenty to thirty, and torch-on felt ten to twenty.
Why do roofs get replaced before the covering wears out?
A roof reaches the end of its life when its shortest-lived component does. Nails corrode, battens decay and underlay perishes well before slate or tile wears out, and none of those can be renewed without stripping the covering.
Torch-on felt lasts 10 to 20 years. EPDM lasts 20 to 30 years, to 50 where well laid. GRP lasts 25 to 40 years; the iron nail lasts 60 to 100 years, shorter than the slate it holds.
How long do the components underneath last?
Iron nails last sixty to a hundred years, bitumen sarking substantially less than any covering above it, and mortar bedding degrades across decades. Battens vary with timber quality and with how wet the roof has been.
Shorter than the covering, and not replaceable without stripping. Bitumen sarking is shorter than any covering laid over it. Degrades over decades and releases ridge units.
Does position on the house make a difference?
Yes. North-facing slopes dry slowly and hold growth, shaded slopes stay damp longer, and exposed elevations take more wind-driven rain. The same covering on the same house ages at different rates on different slopes.
The roof reaches end of life when its shortest-lived component does. Exposure has a modifier of north-facing, exposed and tree-shaded slopes age faster than sheltered ones.
- The shortest-lived component determines the when the roof reaches end of life.
Can you tell a roof's age by looking at it?
No, not reliably. A sound-looking covering routinely sits over perished underlay and corroded fixings. Appearance from ground level indicates almost nothing about the components that determine when the roof needs replacing.
- Iron nails expire before the slate they hold.
- Battens cannot be renewed without stripping the covering.
- Exposure shortens every figure on a given roof.
Some of it cannot be renewed on its own.
The parts that only a strip-off can reach
Roofs are replaced when fixings, battens or underlay expire, all of which fail earlier than the material on top. Nail, batten and underlay service lives are what actually decide the replacement date, and no competitor lists them.
Getting a roof's condition assessed
A north-facing shaded slope reaches end of life measurably before a south-facing one on the same house. Battens and underlay cannot be renewed without stripping, so their condition converts maintenance into replacement.
Service life, and 5 more
- service life
- batten
- sarking
- bedding mortar
- fixing
- exposure
A roof reaches the end of its life when its shortest-lived component does, not when the covering wears out. Natural slate lasts beyond a century and clay tile around eighty years, but the iron fixings holding them run sixty to a hundred, and the battens and bitumen sarking beneath carry no published figure at all. That absence is the finding: the parts that decide when a roof is replaced are the ones nobody quotes a service life for, and neither can be renewed without stripping the covering above.
Read next
Book a free roof survey
Or call 07446 375079.