vault is a type of roof that uses arches. There are two main
types of vaulting: 'barrel vaulting' which is a continuous
arch, and 'quadripartite vaulting' in which four arches radiate
from a single point.
In constructing vaulting first the arches are constructed
using wooden frames, called 'centrings', which have stone
mortared in place over them. Wooden boards, called 'lagging'
are then placed in between the arches that are then covered
in thin stone slabs, called 'webbing'. A layer of concrete
is then laid on top of the vaulting.
Only two mediaeval cathedrals in Scotland had high vaulted
ceilings. They were St Andrews and St Magnus Cathedrals.