Info

assembly

sub-component sub-component

1.10 The sub-component drawing illustrates how the component itself is made

1.9 The fundamental search pattern of 1.5 now runs through the schedule specification, trade literature and, possibly, the biHs of quantities. If considered as a drawing then it clearly possesses all the directive qualities of a location drawing, and could be so regarded. But it will inevitably be of a different nature—and indeed size—from the other location drawings in the package, and its status as such puts it in an anomalous situation when used in conjunction with other documents—as an adjunct to the bills of quantities, for example.

Maximum flexibility in use is therefore achieved by acknowledging the hybrid nature of the schedule for what it is, and by treating it as an independent form of document in its own right, capable equally of being bound into a set of drawings or into a specification.

The package is nearly complete. It requires two further categories of drawing to render it entirely comprehensive, however. They may be dealt with quite quickly.

Sub-component drawings: First, it will become desirable at times to illustrate how a component itself is made. The frame sections of a timber window, for example, are often better shown separately from the drawing showing the window itself, for they may well be applicable to a number of windows whose overall sizes and appearances are widely different. Yet to term the drawing showing these sections a component drawing is inaccurate, as well as being potentially confusing. In the hierarchy of information it is clearly one step lower and more detailed.

It is, in fact, a sub-component drawing and there is a place for it as such in the set (1.10).

Information drawings: Secondly, there is a class of drawing which conveys information, not so much about the building and its elements as about the building's background. Such matters as the site survey, records of adjoining buildings, light envelope diagrams, bore hole analyses all fall into this category. They have this feature in common, which distinguishes them from the

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