Loss of gloss to concrete tiles

Causes

Weathering of the polymer film applied to the tiles during manufacture

Listed under: finishes, tiles, concrete and cement, concrete tiles, Roof, cladding, roof cladding, concrete or clay tiles

Cause

Weathering of the polymer film applied to the tiles during manufacture

Repair

  • concrete tiles commonly have a polymer coating designed to help suppress the appearance of efflorescent salts early in the life of the roof. (Efflorescence is a normal process where calcium carbonate crystals form on the surface of uncoated tiles, giving the appearance of a whitish haze.) The polymer coating has a relatively short lifespan of around 3–5 years, after which it has weathered away

  • manufacturers’ literature makes it clear that the appearance of concrete tiles will change over time, becoming duller. This is completely normal and does not affect weathertightness. If the appearance is acceptable, no action is required

  • if the appearance of the roof is not acceptable to you, discuss this with the tile supplier. Spray coating is often possible, but should only be undertaken by an experienced specialist, not a builder or maintenance contractor. Be aware that once a concrete tile roof has been painted it needs to be periodically recoated to maintain its appearance

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