What is a beam acting as a tie, as at the bottom of a pair of principal rafters, to prevent them from thrusting out the wall. See Illust. of Timbers, under Roof. Gwilt called?

tiebeam — A beam acting as a tie, as at the bottom of a pair of principal rafters, to prevent them from thrusting out the wall. See Illust. of Timbers, under Roof. Gwilt. (Webster's 1913.)

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