2.2.4 SPACING OF JOINTS
Unless alternative effective means are taken to avoid cracks by allowing
for the additional stresses that may be induced by temperature or
shrinkage changes or by unequal settlement, movement joints should be
provided at the following spacing:-
(a) In reinforced concrete floors, movement joints should be spaced at not
more than 7.5m apart in two directions at right angles. The wall and floor
joints should be in line except where sliding joints occur at the base of
the wall in which correspondence is not so important.