Vault ceiling is an architectural ceiling term for an ached form used to provide a space or roof.A vaulted ceiling can have unequal sloping sides, a single sloping side, or a curved/arched slope. thats why a vaulted ceiling adds volume to the room , giving the illusion of a much larger space.

the simplest kind of vault ceiling is the barrel vault also called wagon or tunnel vault, barrel vault ceiling resembles a barrel or tunnel cut length wise in half, the result is semicircular shape or a continuous arch where the length being greater than its diameter.

Groin vault is another type of vault ceiling , when tow semicircular barrel vaults of the same diameter cross one another these intersection is known a groin.