The company I work for builds spec homes. One of the ways we dress them up is by adding barrel-vault ceilings. Except for the layout, these impressive architectural details are not that hard to frame. A carpenter and helper can do it in four to five hours.
Our vaults are typically installed in a rectangular opening in a hallway or master bathroom. As a result, the opening is rarely more than 6 feet wide or 12 feet long. Framing a larger vault wouldn't be any different, but we've never had the space.
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