Term:Joist

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A length of timber or steel supporting part of the structure of a building, typically arranged in parallel series to support a floor or ceiling and perpendicular to a beam.

Merriam-Webster Online Dictionary

joist (noun)

any of the small timbers or metal beams ranged parallel from wall to wall in a structure to support a floor or ceiling

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Categories: Division 05 - Metals, Division 06 - Millwork