A master mason — pricing the new choir vault at a Benedictine abbey, 1138
The Price of a Vault
The precentor wants a price, and a price has parts. So the mason walks him out under the centring — the great timber cradles raised above the choir — and shows him where the money goes. Two ribs of cut stone will cross each bay, turned arch by arch over the timber. Between them his men will lay the webbing, thin stone a hand's breadth thick, light as the work allows. When the mortar has cured through a summer, the carpenters will strike the centring, and the vault will stand on its ribs, and the ribs will carry every pound of it down the shafts into four piers. Almost nothing rests on the wall. That is the discovery of the age: unburden the wall, and you may open it for glass.
He names the figure at last, in marks by the bay, each cutter paid by the mark scratched into his stone, watches the precentor flinch, and offers the old comfort. Offerings at the shrine will meet some of it; the abbey's wool the rest, the Flemish buyers being reliable. And no man builds a church in his own lifetime. He will vault this choir. The crossing tower is his son's work, God willing, and the west front belongs to men not yet born.
There is talk of war in the south, lords quarrelling over the crown. He caps the new courses with straw and dung against the frost, the only enemy that has ever beaten him.
True — A rib vault sends its whole weight down the ribs into piers rather than walls, freeing the walls for glass — English masons had already raised high rib vaults at Durham by 1133.
From this doorway: The Pillars of the Earth — The novel that turned exactly this — a vault rising through a civil war — into one of the best-selling stories ever told.