Civil Engineering Reference
In-Depth Information
Where trussed rafters are used in conjunction with a detail such as that indicated in Fig.
7.24e, it must be borne in mind that the timber will be planed not sawn, as will have been
traditionally the case, that it is likely to be stamped with bright red or other colour stress
grade marks, and that for economy reasons the trusses (and therefore their exposed rafter
feet) are likely to be spaced at 600 mm centres compared to the more normal 400 mm
centres of the traditional buildings.
Assuming that the centres of the trussed rafters are acceptable, the grade marks may
