Replacement concrete floor.

Tristar · 1 Nov 2010

I am about to replace a floor in an 1890's terraced house. The undersite is solid clay. While I appreciate that up to 18" should be removed to be ideal, what is the depth of slab that building control will accept? I plan to use a good levelling layer of sharp sand beneath the 1200 DPM on the clay, I then intend to use 70 -75mm of insulation. If I finish with a 4" polished concrete slab, I'm hoping to get away with only going down about 10". I shall have an insulating layer around the edge of the slab and be sealing the joint to wall with synthaprufe.
TIA

Ooops sorry, wrong forum, reposted under 'Building'. Mods please delete under this forum.

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Replacement concrete floor.

Tristar

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