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Short Stages for an Extension Foundation


Short Stages for an Extension Foundation

Setting out

Getting wrong in excavating is all too easy. If you end up having to have extra trenches filled with concrete, this means extra cost for you.

Even when dimensions haven’t been specified, planning enforcement officers can scale off the drawings to check that your home is where it should be. The distances to boundaries and the levels are both important from a planning aspect, because of the issues of overlooking and

Trench fill foundation

Trench fill avoids bricklaying below ground. The concrete is poured to within 150mm of the surface ground level, saving time and trouble. The sides of the trench play as much a part in supporting the load as the bottom, and so this foundation must only be used in stable ground, where the trench sides are firm and capable of bearing loads. Clay and chalk soils are ideal for trench fill foundations.

Strip foundations

Usually wider, strip foundations use less concrete by being thinner. They’re typically 300mm thick. The exact thickness will need to be determined by the masonry courses of the walls up to the damp-proof course. Strip foundations are often necessary for softer soils, such as sand, since they spread the load of the building out over a greater area.

Building control

The building control officer must be notified at a certain stage and await their inspection. The contractor could be assigned for this duty, but check for yourself that the works have been inspected and approved before covering