The short answer
It depends on the material and the workmanship. Natural slate and clay tiles can last for generations, concrete tiles for several decades, and flat roof coverings for a shorter time, with GRP and EPDM lasting longer than felt. The covering is often not what fails first: underlay, flashings, fixings and ridge bedding wear out sooner on many roofs. Quality fitting, good ventilation and occasional checks give a new roof its best chance.
Why no single number is honest
You will see lifespans quoted as neat ranges. Manufacturers state them, guides repeat them, and every roofer has a favourite. A figure is only a guide, because the same tile on two houses can age very differently. A sheltered south-facing slope in a quiet street is easier on a roof than an exposed ridge in the open country around Basingstoke, and a roof under overhanging trees stays wet and mossy. We would rather give you the factors than a number we cannot stand behind.
This page is about a newly fitted roof and what fails first; for the lifespan of older roofs by covering, see our guide on how often roofs need replacing.
How the main coverings age
Natural slate is the long-distance runner. The stone itself can last far longer than the building, and the usual failure is the fixings: iron nails rust and slates slip. Re-fixed with copper or stainless nails, a slate roof can go on for a very long time. Clay plain tiles are similar, durable if of good quality, though poor ones can delaminate in frost. Concrete tiles are the common modern choice, and their life is long but shorter than clay or slate, with surface wear, colour loss and moss to deal with as the years pass.
Flat roofs are a different story. Torch-on felt layers wear faster, particularly in the sun, while EPDM rubber and GRP fibreglass coverings, when properly detailed, tend to last longer. Metal and lead sheet can last a very long time if the detailing allows for expansion. In every case, the workmanship at the edges, upstands and outlets matters more than the sheet in the middle.
The parts that fail first
The covering often outlives the parts that support it. Underlay is the layer under the tiles that carries away any water that gets past them, and cheap or poorly lapped underlay can degrade before the tiles do. Lead flashings around chimneys and valleys can crack from thermal movement. Mortar bedding under ridge and hip tiles crumbles with weather, which is one reason current practice, under BS 5534:2014, relies on mechanical fixings. Gutters and fascia boards at the eaves rot or sag. When people say a roof has failed, they often mean one of these.
It is worth choosing details with that in mind. A new roof with a decent-grade underlay, stainless fixings and properly fixed ridge parts is built to last as long as its tiles. One with budget parts can look the same on day one and fail in half the time. The page on choosing materials for a new roof goes through the options.
What shortens a roof's life
Poor ventilation is a quiet killer. Warm moist air from the house that cannot escape condenses in the roof space and rots timbers from within. Overhanging branches drop leaves and moss spores, and keep the surface damp. Blocked gutters push water back under the eaves. Fixing something to the roof without proper flashing, such as an aerial, a satellite dish or a solar panel, opens a path for water. Walking on tiles breaks them. Pressure washing, if done carelessly, strips granules and drives water under laps.
Poor fitting shortens life most of all. Tiles laid to the wrong gauge, nails that miss the batten, short laps and a rushed ridge all show up within a few winters. This is the reason the choice of roofer matters more than the choice of brand.
Getting the most out of it
An annual look from the ground with binoculars, and after any storm, catches slipped tiles early. Clear the gutters each autumn. Remove moss gently, without a jet wash. Have a roofer check the roof every few years, and keep any records. A small repair now costs far less than the ceiling it saves. If you are unsure whether a roof has years left, the page on when to replace a roof sets out the signs.
Ventilation and the roof space
A roof lasts longer when the space beneath it can breathe. Eaves vents, ridge vents or breathable underlay let moisture leave the roof void, and without them condensation forms on the underside of the covering and the rafters. Over years that rots timber and rusts nails. When loft insulation is topped up, it must not block the eaves airflow, and a baffle is fitted to keep the gap clear. Many roofs that look old at 30 years are suffering from damp inside, not weathering outside.
Guarantee versus lifespan
A guarantee is not a forecast. Ours covers the workmanship for ten years, written down, and that is a promise about the quality of the work, not a claim about how long the tiles will last. Manufacturers may offer their own product warranties on tiles or membranes, often for longer periods but with conditions. When the house is sold, what a buyer inherits is a separate question, answered in our guide to passing a guarantee on.
On a survey we look at the underlay, the fixings and the ventilation as well as the tiles, and photograph what we find. If an older roof still has years left, we say so. Everything else about the job sits under roof replacement.
Every roof is different. A free survey with photos settles it for yours.
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