Front garden wall footing?

20 May 2012
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United Kingdom
I have a front garden wall approx 50cm high x 5 meters. It is straight and level but the bricks are well weathered. I am to take this down and replace it with a wall constructed of a brick pillar at each end and single skin breeze block connecting the pillars (which will be rendered and painted) approx 1200mm in height. Therefore this is a lightweight construction? I would like to use the existing foundation due to costs mainly. Is there any way of checking how good the foundation is? Does this sound feasible? Advice welcome please.
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The only way of checking is the dig down and look at what you have. It depends on what the subsoil is like.
Are you on chalk?
You need to dig a hole and inspect the current foundation. The depth of concrete depends on the condition of soil and load being placed on it. For a 1.2 metre high wall you would need the footing to be about 400mm deep. Width of footing should be 300mm, so you will have 100mm overhang each side of the 100mm blocks.

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