The technique of corbeling or sloping brickwork inward to reduce the cross-sectional area of a flue or chimney. Masons gather the brickwork above a firebox to smoothly direct smoke and gases into the narrower chimney stack without creating turbulence.
Heard on the job
We need to gather the brickwork tightly above the damper so the smoke draws properly into the flue.
Also heard as
- gathering