Component, sub-component and assembly drawings
Specification
The function of the specification in relation to a
competent and comprehensive set of drawings may be
defined quite simply. It is to set out quality standards for
materials and workmanship in respect of building
elements whose geometry, location and relationships to
one another have been described by means of the
drawings.
It follows therefore that in a properly structured
information package neither specification nor drawings
should trespass upon the other’s territory. If the drawing
calls for roofing felt then it need describe it simply as
that—‘roofing felt’, or ‘built-up felt roofing’. If only one
type of built-up roofing felt construction is to be used on
the project then that simple description suffices. If more
than one, then ‘built-up felt roofing type 1’ will be a
sufficient indication of intent. To the specification will
then fall the task of describing in detail just what ‘built-up
roofing felt type 1’ is to consist of.Conversely, the specification is no place for instructions
such as ‘Cover the roof of the boiler house in three3.22 ‘Vocabulary’ type of schedule. It is dangerously easy to get a dot in the wrong place