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Tile roofing traditionally consists of locally available materials such as clay, granite, terracotta or slate, though many modern applications contain concrete. Imbrex and tegula, style dating back to ancient Greece and Rome. Monk and nun, a style similar to Imbrex and tegula, but basically using two Imbrex tiles. Dutch roof tiles, Netherlands
Concrete roof tiles tend to feature around 13% moisture absorption, which requires periodic resealing every 3–7 years to avoid critical failure. [ 75 ] [ 69 ] The inherent porosity of cement requires that cement tiles are made very heavy and thick, as a result they have continuously been one of the heaviest roofing materials in the market.
The main ingredients of a concrete roof tile are sand, concrete, water and colour pigments on an iron oxide basis. From the beginning, Braas gave a 30-year-guarantee on the materials of the "Frankfurter Pfanne" and was thus the first manufacturer in Germany to give long-term guarantees on building materials. [ 19 ]
Later tiles have been made from materials such as concrete, and plastic. Roof tiles can be affixed by screws or nails, but in some cases historic designs such as Marseilles tiles utilize interlocking systems that can be self-supporting. Tiles typically cover an underlayment system, which seals the roof against water intrusion. [12]
Concrete roof tiles are also a common choice, being available in many different styles and shapes. Sheet metal in the form of copper and lead has also been used for many hundreds of years. Both are expensive but durable, the vast copper roof of Chartres Cathedral , oxidised to a pale green colour, having been in place for hundreds of years.
Concrete is a composite material composed of aggregate bonded together with a fluid cement that cures to a solid over time. Concrete is the second-most-used substance in the world after water, [1] and is the most widely used building material. [2] Its usage worldwide, ton for ton, is twice that of steel, wood, plastics, and aluminium combined. [3]