We're a bit disappointed that the membrane covering the EPS has been punctured quite a lot. It looks like the surface wasn't flattened properly so to even out the height the mesh and a-frames have been manipulated a bit and have damaged the pink layer:
The membrane is supposed to protect us from the slightly high radon levels caused by the mines in the area ('Romans' and Bwlch arian) in the nineteenth and early twentieth centuries...
The height of the breezeblock is where the concrete will reach and it varies a little around the slab:
And there are a few gaps to fill in - if cold air gets into the EPS and through the membrane we'll have cold feet!
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