Corbel
/KOR-bel/
Also known as: corbelling, corbelled course, masonry bracket, stone corbel
Definition
A projection of brick, stone, or concrete built out from a wall face in stepped courses to support a load above - such as a beam end, chimney breast, or overhanging section of masonry. Each corbelled course projects slightly further than the one below.
In Practice
Traditional corbels are built by stepping successive brick courses out by no more than one-third of the brick length per course. Modern corbels may use precast concrete or purpose-made steel brackets. Corbels are common in chimney breasts where the flue widens at hearth level, and in heritage buildings to support bay windows or upper floor overhangs.
UK Building Regulations
Approved Document A - Structure
The total projection of a corbel should not exceed the thickness of the wall from which it projects. Structural engineer sign-off is advisable for corbels carrying significant loads.