- Stiff clay subsoils have good bearing strength and are subject to seasonal volume change
- Because of seaspnal changes , it is practice to adopt a foundation depth of at least 0.9m to provide a stable foundation
- A deep strip foundation will go to a depth where the clay soil is unaffected by seasonal changes .
- Also known as deep strip foundation or trench fill foundation.
- Because of the good bearing capacity of the clay , the foundatuion just need to be little wider than the thickness of the wall to be supported.
- Trenches are usually formed by using mechanical excavators
- THe trench is filled with concrete as soon as possible so that the sides of the trench do not fall in and the exposed clay bed does not dry out and shrink.
(cavity wall , brick cuter and concrete block inner skin) (load bearing internal wall )
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