Groin Vaults
GROINGlossary Term [1] VAULTS are formed from two intersecting barrel vaults (the groins are the edges of the intersections). They are built of heavy rubbleGlossary Term [2] masonry and so need adequate support. They were used in the large crypts introduced by the Normans below their new abbeys and cathedrals, where the space was divided into a series of small bays by numerous columns, as at Canterbury, Worcester and Gloucester.