Civil Engineering Reference
In-Depth Information
(4) Figure 5.18 shows a fully independent attic trussed rafter construction. The timbers
used will now be much larger in section than for standard rafters, thus increasing the unit
weight; this must be considered for handling reasons. The steeper pitch necessary to allow
satisfactory room within the roof can mean that the height of the truss will be outside both
manufacturing and transportation practical limits, and in such instances the roof truss may
be split horizontally into two components, the split occurring at the ceiling joist or collar
position. Producing two trussed rafters to form each frame therefore adds to the cost of
such construction. The overall economy of the
