WORKING DRAWINGS HANDBOOK, Fourth Edition

Working Drawings Handbook

layers of built-up felt roofing.’ If a specific roof surface is
to be so covered, then it is the function of the drawings
to tell everybody so, when the full extent of the covering
and the possible operational problems in achieving it
may be clearly and simply described.

This simple differentiation between the roles of drawings
and specification will enable each to fulfil its true
function properly.

Conversion, alteration and rehabilitation

It is now necessary to look at the methods described

previously and to see how far they are applicable to the

description of work to existing buildings.

To dispose of the simple matters first, straightforward

extensions to buildings present no problem. They are in

every respect new pieces of building and there is no

3.23 Lists of ironmongery collected into sets