wagon roof

barrel roof, barrel shell roof

1. A roof of semicylindrical section; capable of spanning long distances parallel to the axis of the cylinder.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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The nave and aisles were rebuilt in 1849 in rubble granite, wagon roof with moulded braces and purlins.
Women traveling west in wagon trains sought comfort in using their hands to stitch canvas-like fabric (used on wagon roof tops) in the thread they had available: the kind used to make candle wicks.