The feasibility of this framing method depends on the design of the longest purlin. Although installation of loose ceiling ties from girder to girder may be
simpler in carpentry requirements, it is generally preferable to adopt the layout shown (incorporating loose timber binders at ceiling level), in order to
The ceiling binders should be supported on the bottom chords of the girders and located against the vertical webs. Arobust structural connection for example, with two proprietary angle plates should be made between binders and loose ceiling joints. The ends of the binders may need to be notched or blocked-up off the girders, to ensure that the undersides of the loose joists
are level with the girders.