WORKING DRAWINGS HANDBOOK, Fourth Edition

Working Drawings Handbook

drawing deals with the forming of the opening as a
single activity, including the insertion of the new lintel
over. It could hardly be dealt with otherwise by the
builder. The drawing showing the new work 3.26refers
only to the new door and frame, inserted in what is by
then an existing opening.

Note that it would be wrong for the drawing showing new
works to make reference to the opening having been
formed under the same contract. To do so would invite
the possibility of the estimator including the item twice.
Neither is the routine note ‘make good to plaster and
finishes’ included on either drawing. Such a general
instruction, which will presumably apply to a number of
such door openings throughout the project, is more
appropriate to the specification or schedule of works.

Generally speaking, a single demolition plan for each
floor will suffice, but if there are complexities of a special
nature to be covered then the mode of conveying the
information may need to be more elaborate. Figure 3.27,
for example, shows the demolition drawing of a reflected
ceiling plan, where the fact that certain suspended
ceiling tiles and light fittings were to be removed is

carefully separated from the new work which is to

replace them (3.28), as well as from the alterations to

internal partitions, etc. which are covered on another

sequence of drawings.

Simple items of making good, such as the replacement

of areas of plaster, or the overhauling and repair of

windows, are often most simply covered by scheduling

on a room-to-room basis. If only two square metres of

plaster are to be replaced in a given room, it is

presumably obvious enough to all concerned which

two square metres are referred to, without the necessity

of precisely locating them on an internal elevation.

Written description, in fact, is often better than

graphical instruction in much rehabilitation work.

If CI/SfB coding is being adopted for the set then

demolition drawings will normally be given a (—) ‘project

in general’ code, leaving the more detailed code

references for application to the new works.

One extremely important point is often overlooked in

drawings of alteration work, with unfortunate consequent

effects. It is absolutely vital that everyone should be clear

3.25 Demolition drawing covering formation of new opening in an existing wall