Civil Engineering Reference
In-Depth Information
enough on the bottom chord. The Howe configuration has an extra support on the bottom
chord, dividing the span into four rather than three bays of the fink. Again a girder will be
formed of two (or three) Howe trusses, and this time the monopitch truss will definitely be
bottom-chord supported in truss shoes. The upper part of the Howe (that triangle above
the monopitch roof), will have to carry some form of cladding, possibly rendering or
boarding. The additional weight of this cladding must not be overlooked when designing
the truss.
Barn or Dutch Hip
One method of constructing this roof feature is illustrated in Fig. 6.6. This time no girders
are required as there are no monopitch trusses from the hip to support. It is commonplace
to use a series of flat-topped fink-based trusses, again with flying top chord to be cut to fit
the small hip board needed to complete the roof feature. Infill timbers from peak of gable
to these flying rafters complete the roof structure.
Fig. 6.6
Barn or Dutch hip trussed rafter layout.
Hip Corners
