Also found in: Dictionary, Thesaurus, Wikipedia.
collar beam[′käl·ər ‚bēm]
A tie beam in a roof truss connecting the rafters well above the wall plate.
A horizontal member that ties together two opposite common rafters, usually at a point halfway up the length of the rafters below the ridge. See also: Beam
collar beam, spanpiece, sparpiece, top beam, wind beam
A horizontal member which ties together (and stiffens) two opposite common rafters, usually at a point about halfway up the rafters in a collar beam roof.