Clay and concrete are the two dominant materials for pitched-roof tiles in the UK. Clay tiles are fired from natural earth, hold their colour for decades and tend to cost more; concrete tiles are moulded from sand, cement and pigment, weigh more, cost less per tile and now make up the majority of new and replacement roofs. Both can last well beyond fifty years when laid correctly on a sound structure.
Clay or concrete: what's the real difference?
The starting point is the raw material. Clay tiles are made from natural clay, shaped and then fired in a kiln at high temperature, which gives them their density and through-colour. Concrete tiles are pressed from a mix of sand, cement, water and pigment, then cured rather than fired. That difference in manufacture drives almost everything else: colour stability, weight, surface texture and price.
Clay carries its colour throughout the body of the tile, so chips and edge wear are far less noticeable. The fired finish is generally regarded as having a more traditional appearance, and clay is the expected covering on many older and listed buildings. Concrete typically takes a surface coating of pigment that can fade or weather over time, exposing the greyer body beneath, though modern coatings have improved this considerably.
On cost, concrete is usually the cheaper option per tile and is widely produced, which keeps prices competitive. Clay sits at the higher end, with handmade clay tiles costing more again than machine-made ones. Price comparisons should always include the full system — battens, underlay, fixings and labour — rather than the tile alone, since these are similar regardless of material.
How each weathers and ages
Clay and concrete are the two dominant materials for pitched-roof tiles in the UK.
Clay tends to age gracefully. Because the colour runs through the tile, a fired clay roof can look much the same after several decades, sometimes acquiring a subtle patina or moss that many people find attractive. Good-quality clay is highly resistant to frost and to the salts and acids found in some atmospheres.
Concrete ages differently. The surface pigment can lighten and the texture can roughen, which encourages moss and algae to take hold. This is largely cosmetic in the early years, but a heavily weathered concrete roof can look tired well before it has actually failed. Concrete can also absorb more water than clay, which adds weight in wet weather and can accelerate surface erosion over a long life.
Both materials are vulnerable to the same underlying problems: poor fixing, inadequate ventilation and a failing underlay (the membrane laid beneath the tiles). A tile that is sound in itself will still let water in if the layer below it has perished. Weathering of the tile surface and failure of the roof as a system are two separate things, and it is worth keeping them distinct when judging a roof's condition.
Plain versus interlocking tiles
Beyond the material, tiles fall into two broad families by shape, and this choice affects appearance, pitch and quantity as much as the clay-or-concrete decision does.
- Plain tiles are small, flat and usually laid in a double-lap pattern, meaning each course overlaps the two below it. This gives a fine-grained, traditional look but uses a large number of tiles per square metre — often around sixty — which adds weight and labour.
- Interlocking tiles are larger and shaped with grooves along their edges so that adjacent tiles fit together and shed water without needing the same overlap. Far fewer are needed per square metre, which makes them quicker to lay and lighter overall for the area covered.
Both plain and interlocking tiles are made in clay and in concrete. Plain tiles are common on smaller, steeper roofs and on properties where a period appearance matters. Interlocking tiles are the usual choice on larger modern roofs where speed and cost weigh more heavily. The minimum pitch matters here: plain tiles generally need a steeper pitch (the angle of the roof slope) to drain properly, often around 35 degrees or more, while many interlocking profiles are rated for lower pitches. A tile's manufacturer states its minimum pitch, and laying below that figure risks water ingress regardless of material.
Tile weight is closely tied to this choice and to the material. Concrete is heavier than clay tile for tile, and plain tiling is heavier than interlocking because of the sheer number of tiles. On a re-roof, the existing roof structure was designed for a particular load, so swapping a light interlocking concrete tile for heavy clay plain tiles, or the reverse, can change the demands on the rafters. A structural check is sensible before any change of tile type, and a surveyor or structural engineer can confirm whether the timbers are adequate.
Lifespan and what shortens it
Both clay and concrete tiles can be expected to last well beyond fifty years, and good clay is often quoted with a longer potential life still. Manufacturers commonly offer guarantees in the region of thirty years, though the practical life of a well-laid roof usually exceeds the guarantee period by a wide margin.
What actually shortens a tiled roof is rarely the tile itself. The most common causes are:
- Underlay failure — the membrane beneath the tiles perishes long before good tiles do, and is a frequent reason for re-roofing an otherwise sound covering.
- Poor fixing — tiles that are inadequately nailed or clipped can lift or slip in high winds, particularly on exposed sites.
- Frost damage — water that soaks into a porous tile and then freezes can split it; this affects low-quality or already weathered tiles more than sound ones.
- Mortar and detailing — failed ridge and verge mortar, lead flashings and valley details often let water in before the field tiles ever fail.
- Mechanical damage — foot traffic during other work, falling debris and ladder contact can crack individual tiles.
In practice, the lifespan question is less about choosing clay over concrete and more about the quality of the whole installation and its maintenance. A second-rate tile laid carefully on good underlay with proper ventilation will often outlast a premium tile fitted poorly. When comparing the two materials, it is worth weighing the higher upfront cost and longer colour stability of clay against the lower cost and heavier weight of concrete, set against the structure available to carry it.
Reviewed: June 2026