Vitrified clay, the standard below-ground drainage material until the later twentieth century. It is durable and chemically resistant, but rigid and jointed at short intervals.
What it means for you
Almost all Victorian and Edwardian London property still drains through clay, and the joints are where the trouble starts.
Not sure whether this applies to your property? Ask us. There is no call-out charge and the price is fixed before any work starts.
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