The specification gives a general description of what is
required but it is also necessary for the client or his agent to
provide specific detailed information. The following list is an
extension of that given in BS5268:Part3.
(a) The height and location of the building, with
reference to any unusual wind conditions.
(b) The external profile of the trussed rafter, including
any allowances required for tolerances.
(c) The span of the trussed rafter.
(d) The pitch or pitches of the roof.