(57) The invention relates to a mortarless interlocking building block (10). The building
block comprises a pair of opposed major side faces (12,14), a pair of opposed minor
end faces (16,18) and a pair of opposed major upper and lower faces (24,26), the upper
or the lower face having a profile, when viewed in a direction normal to the end faces,
with an outer semi-channel (82) and an inner full channel (88) alternating with an
inner full projection (86) and an outer semi-projection (84). The semi-channel and
the semi-projection are half the width of the full channel and the full projection,
and the channels and projections extend longitudinally between the opposed end faces
(16,18) of the block. The opposed lower or upper face (26,24) of the block is symmetrical
about an imaginary axis (38) which extends transversely between opposed side faces
to divide the lower or upper face into two equal halves (102,104). Each half has a
profile, when viewed normal to the major side faces, comprising a semi-projection
(40,42) and a full projection (50,52) alternating with a full channel (44,46) and
a semi-channel (48), all of which extend transversely between opposed side faces,
and which are complemental with the channels and projections on the opposed respective
upper or lower face. A pair of apertures (20,22) extend between the upper and the
lower faces, the apertures being divided by an inner web (28) which extends transversely
between the opposed side walls (30,32) of the block parallel to the end walls (34,36).
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