Working Drawings Handbook
from the drawings as to what is new work and what is
existing. Basic structure is not too difficult to distinguish
(shading in existing walls and showing the details of
construction on new walls will avoid confusion in this
respect) but it is the little things—manholes, rainwater
pipes, sanitary fittings—often appearing as left-overs
from the survey drawing, which need specific annotation.
It is, of course, helpful to issue the survey drawings as
part of the set.
Activity drawings
The provision of a new door in the existing brick wall,
given as an example in the section on conversions and
alterations, was an instance of an activity-oriented
approach to the provision of building information.
Activity 1, involving the cutting of the opening and
insertion of the lintel, was rightly regarded as being
distinct and of a different nature from activity 2, which
embraces the fixing of a new door and frame. The two
activities were separate and complete in themselves;
they were potentially capable of being carried out by
different people or groups of people; and they might
well have been (and indeed probably were) separated
from each other by a significant period of time, during
which no work of any kind was being done to either the
opening or the door. It was possible, therefore, and on
the face of it reasonable, to convey the necessary
information to the builder in the form of two separate
instructions.3.28 Drawing showing new works replacing demolitions shown in 3.27