What does the term "centering" mean related to brick construction?
Centering is the formwork, usually made from wood, that is used to support the masonry on an arch or barrel vault before the masonry is placed and before it has gained sufficient strength to support its own weight. Centering will support the masonry and form the curvature of the arch or vault. Often, depending on the structure, the centering can be reused to build many arches.