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A retaining wall’s solidity is determined by the strength and stability of its base. Using a 4ft tall cinder block retaining wall as an example, a compacted base of around 4 to 6 inches will be required for maximum stability, as well as 1 inch of leveling sand. A trench deep enough to accomodate the aforementioned materials, as well as half the height of the cinder blocks used. Against a backfill of crushed rock, step each succeeding course back in by ¾ of an inch.
The backfill should stop 6 inches from the top of the wall, whereupon you should use a topping of native soil to help prevent water getting into the trench. Cinder blocks should be reinforced with pins, and the cap block – the block placed on the top of the wall – should be secured with a concrete adhesive (to reduce stress strain).
To find out more about concrete cross sections or concrete services iMix offer across London and surrounding areas, please contact us today on 0800 030 9015 or fill in our handy contact form.
