Graphical Construction Glossary >> masonry. >> arch >> Rear Arch

Rear Arch
Also known as Arriere-Voussure. A rear vault or arch behind the face of a wall. An arch in a thick wall that carries part of the thickness of the wall, particularly one over a window or door frame.

a rear arch or relieving arch over a window

These relieving arches are of course used to share the load of the masonry above the opening, but at the same time they add amenity to the room that they serve. The extra height and width of the (in this case) outer openings gives a lot more light and a wider field of view than if the window opening went through the full width of the wall.

In addition they also gave the architects more possibilities for establishment.

a relieving arch over an oval window

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