bonnet roof
A roof having a double slope on all four sides, the lower slope being less steep than the upper slope; often extends […]
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booster pump
An auxiliary pump which is used in a piping system to increase or maintain the pressure in the system.
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book matching, herringbone matching
The assembling of wood veneers from the same flitch so that successive sheets are alternated face up and face down. In figured
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bond header
In masonry, a bondstone that extends the full thickness of the wall; also called a throughstone.
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board sheathing
A sheathing of board, usually tightly spaced, but some roof constructions use open spacing between boards.
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bolection molding, balection, belection, bellexion, bilection, bolexion
A molding projecting beyond the surface of the work which it decorates, as that covering the joint between a panel and the surrounding