Common rafters
Regularly spaced uniform rafters placed along the length of the roof, or between principals; also called coupled rafters. A common rafter or coupled rafter roof has pairs of rafters only, i.e.
Collar purlin, a beam running longitudinally immediately beneath the collars joining pairs of common rafters.
Collar beam / collar tie: A horizontal timber uniting two opposite common rafters at a point below the ridge, usually in the upper half of the rafter length ...
 See also: Timber, Rafters, Church, Principal, Rafter
  
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