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Hi, first post on these forums. Our building project has got to the stage where foundation trenches have been poured and block & beams are supported on blockwork. Before we go on, the ground has proved very difficult - heavy clay on a sloping site and water frequently pools on top of the foundation and hence under the floor. Because of this we are going to lay 100mm perforated pipe all around the perimeter and discharge it into the rainwater drainage exit pipework (below foundation level). The question is what material to use for backfilling over the pipe. I know it will require something like gravel with a Geotex wrap to prevent sediment getting into the pipe but I don't like the idea of bringing any of the clay back in as it will shrink and settle like crazy. There are to be paths and patios to most walls so whatever backfill is used it has to be well compacted. Would 10mm gravel (around the pipe) topped with Type 1 be sensible or any better ideas? The depth required varies but there's a considerable volume to fill so cost is highly significant.
