Arch and lintel are provided above doors, windows and passages. The function of an arch and a lintel is to carry the weight of the structure above the opening. In an arch because of the shape, the blocks support each other by the mutual pressure of their own weight and the structure remains in position by the resistance from the supports. Special types of centring devices are incorporated.

A lintel is a horizontal member used to span openings in walls. It functions similar to that of an arch. Lintels provided over windows are connected to a sunshade to provide shade and shelter. Centring for lintels are much simpler than that of arches.

Materials such as wood, stone, steel, brick and concrete are used both ...

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