straining sill

noun

: a straining beam on the tie beam of a truss to resist at each end the foot of a diagonal strut

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(in a roof with a queen post) a compression member lying along the tie beam and separating the feet of the struts.

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straining sill noun (building)

A piece of timber lying on the tie-beam of a timber roof and butting against the bottoms of the queen posts

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Main Entry: ↑strain