Collar beam

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(Arch.) a horizontal piece of timber connecting and tying together two opposite rafters; - also, called simply collar.

See also: Collar

References in periodicals archive ?
A steel bridge for ventilation units is applied to the collar beam position.
The structural design called for a new concrete collar beam around the roof perimeter, new concrete roof diaphragms, the removal and replacement of all steel joists and deck, and a well-insulated roof.
The angle of the rope from the tree to the collar beam on the "A" was not ideal.