Collar purlin, a beam running longitudinally immediately beneath the collars joining pairs of common rafters.
COLLAR PURLIN: a major roof beam that connects the collar beams at the midpoint and which thus runs immediately below the ridge beam. COLONNADE: a row of columns. COLONNETTE: a small pier.
Collar purlin or crown plate: central timber which carries collar-beams and is supported by crown-posts. Side purlins: pairs of timbers placed some way up the slope of the roof, which carry common rafters.
 See also: Collar, Purlin, Timber, Crown, Church
  
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