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 ?
New roof construction as rafters and collar beam roof of two gabled roofs, insulation installation as Vollsparren- and rafter, substructure for separate roofers - 400 m2; appropriate dormer constructions - about 11 dormers; appropriate crossing structures for connecting a stair tower ge.
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.