No, the slab (59cm x 29cm) is resting on the actual concrete path
outside the back door and is simply there to raise the step slightly.
The slab rocks very slightly when I tread on it because there's a 5mm
gap in one corner. At present I have whacked a very small wooden wedge
under the corner and the slab is now perfectly firm. But the wedge
will dislodge over time, which is why I want a more permanent solution
with said sand/cement mix. About 1/2kg of it should suffice.
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