Hammer-beam roof
Purlin(e): A piece of timber laid horizontally on the principal rafters of a roof to support the common rafters on which the roof covering is laid.
St. Andrew's Episcopal Church ...
Hammer-beam roof
One of the wonders of English late medieval carpentry. Hammer-beam roofs are highly decorative, and can span great widths. They are called after the hammer-beam - a horizontal beam projecting out from the wall.
It is thought that the magnificent hammer-beam roofs of England were devised as a direct response to the lack of long straight seasoned timber by the end of the Medieval period, ...
strength to the framing, a large arched piece of timber is carried across the hall, rising from the bottom of the wall piece to the centre of the collar beam, the latter being also supported by curved braces rising from the end of the hammer-beam.
Braces can be straight or curved (also called arched).
Hammer-beam: beam projecting at right-angles, usually from the top of a wall, to carry arched braces or struts and arched braces or struts and arched braces.
 See also: Timber, Frame, Church, Hall, Brace
  
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