How Long Does a Roof Last? Lifespans by Material
How long does a roof last? It depends on the covering, the details around it and how exposed the house is. As a general guide, concrete tile lasts fifty years plus, clay around sixty and natural slate eighty or more. Flat roofs are shorter-lived, with felt at ten to fifteen years and quality GRP and EPDM systems at twenty-five years or more. The figures that matter most, though, are often the mortar, flashings, fixings and underlay, which can need attention long before the tiles or slates wear out.
- Natural slate: eighty years or more
- Clay tile: around sixty years
- Concrete tile: fifty years plus
- Felt flat roofs: ten to fifteen years
- GRP: twenty-five years plus; EPDM: twenty-five to thirty years plus
- Coastal exposure shortens lifespans slightly
Pitched roofs: the covering
Natural slate is the longest-lived common covering. Good slate can outlast the nails and battens holding it, which is why old slate roofs often fail through nail fatigue, with slates slipping one by one, rather than through the slate itself wearing out. Clay tiles are also durable, while concrete tiles slowly lose their surface and become more porous with age.
In the North East, coastal exposure, wind-driven rain and frost all take their toll. Houses near the coast or on exposed high ground can expect slightly shorter lives from coverings and details than sheltered ones.
Pitched roofs: the parts that fail first
Ridge and verge mortar, lead flashings, valley linings and the underlay beneath the covering usually need work long before the slates or tiles. Mortar cracks and loosens; underlay in older roofs becomes brittle or was never fitted. These are often repairable without replacing the whole roof, which is why age alone is not a reason to re-roof.
Roof repointing done properly, with the old mortar fully raked out, typically lasts twenty years or more. A thin skim over failed bedding may last only a few winters.
How long does a flat roof last?
Flat roof lifespan depends heavily on the system. Traditional felt is the shortest-lived at around ten to fifteen years. Our GRP service gives a twenty-five year plus design life, and our EPDM service describes twenty-five to thirty years or more for quality rubber membranes installed properly. Liquid systems sit close behind those.
On flat roofs the deck, upstands and edge details often decide the real life of the roof. A good membrane on a wet deck or with rushed trims can fail early, while a well-detailed roof on a sound, dry deck should reach its expected life.
What shortens or extends a roof's life
Poor ventilation lets condensation build up in the loft or under a flat roof, rotting timbers from the inside. Blocked gutters push water back under the eaves and into fascias. Moss holds moisture against tiles and can lift them. Small faults left alone, such as a slipped tile or a split in a flat roof, let water reach timbers that would otherwise last much longer.
Regular checks, clear gutters and prompt repairs are the cheapest way to get the full life from a roof. Our roof maintenance page explains what that involves.
When age becomes a reason to replace
A roof near the end of its expected life is not automatically due for replacement. The signs that matter are repeated repairs, widespread slipping, sagging, perished underlay and leaks that return after being fixed. Our guide to when to replace your roof sets out ten signs to look for, and a survey can tell you which parts of your roof are worth repairing and which are coming to the end of their life.
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How Long Does a Roof Last? Lifespans by Material FAQs
How long does a flat roof last?+
Felt typically lasts ten to fifteen years. Our GRP service gives twenty-five years plus, and our EPDM service describes twenty-five to thirty years or more when installed properly.
How long does a slate roof last?+
Natural slate can last eighty years or more, although the nails, battens and underlay may need attention sooner.
How long do concrete roof tiles last?+
Expect fifty years plus from concrete tile, with ridge mortar and flashings usually needing attention sooner.
Does an old roof always need replacing?+
No. Many older roofs need repairs to mortar, flashings or a few slates rather than a full replacement. Repeated failures and perished underlay are better signs than age alone.
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