Coding assembly drawings
A complete system for coding the drawing package is discussed in Chapter 5 but a note here on the coding of the drawings illustrated in 3.17, 3.18 and 3.20 may be helpful.
The general arrangement sections (3.17) are coded G for general arrangement; (2-) for primary elements (see notes on general arrangement sections earlier for the reasoning on this); and 017, 018 and 019 because that is their sequence in that particular series.
The references in the circles are to external wall details or to external wall opening
3.20 Simplified version of 3.19 gives adequate information to all concerned details (i.e. to windows) and are therefore coded, respectively: A for assembly, (21) for external walls, followed by their number in the sequence of such details; and A for assembly, (31) for external openings, followed by their number in the sequence of such details.
The assembly section shown in 3.18 is coded: A for assembly; (21) for external walls; and 021 because that is its number in the series.
It is not unreasonable to give a (21) coding to the section shown in 3.18, for it clarifies the construction of an external wall. But then so does the section illustrated in 3.20. Why not code that (21) also?
The answer is that it would be perfectly in order to do so and if you elected to produce a series of details devoted to the assembly problems encountered in constructing the external walls, then you would code A(21)001, etc. accordingly. But it is more likely that in commencing a series of details showing the junctions of two elements—for example, the junction of external openings with the external walls within which they sit— you would find it more convenient, and a better guarantee that you had covered the subject comprehensively, to produce a series of external openings assembly details—and these would naturally fall into the A(31) series.
The examples of assembly details illustrated have consisted of vertical sections through a particular construction but of course the plan section also requires illustration and enlargement at certain key points—door and window jambs, for example.
Where this is the case and where space allows, it is better to group plans and sections together by their common element rather than to produce a series of plan details on one sheet and a series of section details on another. Everyone on site concerned with forming the window opening and with fixing the window into it, will then have the relevant information readily to hand.
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