IGLOO CEILING SPECIFICATIONS
Igloo ceilings, or lunette vaults, are two or more intersecting barrel ceilings or archways at different heights. Where a groin vault is an intersection of barrel ceilings at the same height, a lunette vault intersects at different heights. This ceiling is most commonly utilized when you want a barrel vault, but you have an obstruction such as a window or doorway that would normally disqualify this ceiling as an option. With the help of an lunette vault, you can add an intersecting archway or barrel over a door or window, giving you the height you need.