Building Construction Handbook, Eighth Edition

Dimensional Coordination ~ the practical aims of this concept are to:-

1. Size components so as to avoid the wasteful process of
   cutting and fitting on site.


2. Obtain maximum economy in the production of components.


3. Reduce the need for the manufacture of special sizes.


4. Increase the effective choice of components by the promotion
   of interchangeability.
   BS 6750 specifies the increments of size for coordinating
   dimensions of building components thus:-

the 3rd and 4th preferences

having a maximum of 300 mm

Dimensional Grids † the modular grid network as shown on page 47

defines the space into which dimensionally coordinated components

must fit. An important factor is that the component must always

be undersized to allow for the joint which is sized by the

obtainable degree of tolerance and site assembly:-

Controlling Lines, Zones and Controlling Dimensions † these terms

canbestbe defined by example:-

Preference 1st 2nd 3rd 4th

Size (mm) 300 100 50 25

Modular Coordination