Working Drawings Handbook
complicated than some home-made systems one has
encountered over the years.)
Before looking at this aspect in detail, however, let us
look briefly and without going into superfluous detail, at
the whole range of the CI/SfB system of classification.
There are five tables in the complete CI/SfB matrix:
Table 0deals with building types and its codes are
always of the nature B1.
Table 2deals primarily with manufactured components.
Typical examples would be blockwork—blocks (code F),
tubes and pipes (code I), or thin coatings (code V). The
codes are always as shown, consisting of a single
upper case letter.
Table 3deals with basic materials, such as clay, dried
fired (code g2), gypsum (code r2), or flame-retardant
materials (code u4). It will be seen that when used
with the codes of Table 2 they provide a method of
shorthand for quite specific descriptions of
components—such as blocks in lightweight aggregate
Fp3, clay tiles Ng2, or plywood Ri4.
Table 4deals with the various techniques involved in the
physical process of building, such as testing (Aq) or
demolition (D2).
In terms of classification for drawing purposes however,
we need consider only Table 1 dealing with building
elements—stairs, roofs, ceiling finishes, etc.
The codes are always bracketed, in the form (24), (27),
(45), etc.CI/SfB Table 1 is here given in its entirety (Table III):The hierarchic structure is immediately apparent.
Within it each building element may be considered at
any of three levels, the level selected being determined
by the complexity of the project in question and the
need to break down the conveyed information into
categories of a manageable size. Any element within the
building—a lavatory basin, for example—may clearly be
regarded as forming part of ‘The project in general (—)’.
But it may also be considered as coming within the
category of ‘Fittings (7-)’ (the seventh of the main
sections into which the table is divided). Finally, it may
be regarded as coming within the quite specific grouping
of ‘Sanitary, hygiene fittings (74)’, the fourth sub-division
of section (7-).Windows, in similar fashion, may be seen as coming
within the (—), (3-) or (31) headings, terrazzo flooring as
(—), (4-) or (43). And so on.The primary and secondary information structure is
therefore complete and we are ready to move on to
detailed consideration of what each drawing should
contain and what it should attempt to convey to the
recipient.