The hole for the foundations has been dug and partly filled with broken stone (limestone) . It has been compacted and the radon barrier laid and the radon sump put in place. What is a radon sump you ask - well so did I. It channels any radon gas that come up under the house and channels it into a pipe - away from the house. Find out more here ... http://www.fmb.org.uk/publications/masterbuilder/july99/20.asp
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