How to Install a barrel vault. A barrel vault is the simplest form of vault as it is formed using a constant radius along a distance greater than 24". You have the ability to choose whatever style best suits your application: soft, half circle, or elliptical. Barrel vaults can either be framed up into your attic space or can be framed underneath your joists and trusses. Barrel vaults are most often found in media rooms, hallways, dining rooms, and entryways.
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