Upper of two tiebeams in a doubled tiebeam
A) Base cruck B) Spere truss C) Secondary truss D) Raised cruck E) Upper cruck
a) Wall plate b) Cusp c) Cusped windbrace d) Ridge piece (ridge purlin) e) Principal rafter f*) Plate g) Purlin h) Cranked tiebeam l) Ceiling beam