Have a look at agilia flowing concrete. I've done many floors with no sub base using the agilia at 100mm. Most building inspectors are happy seeing this as the mix is 35 Newton strength (c35) and easily achieves a screed like finish.
The hardcore will have to be fully compacted/whackered and a...
With depths of 100mm it might be worth using agilia.
Its a self compacting flowing concrete which is easy to place and should achieve a screed finish.
Alternatively, if there is a structural base already down, ie block n beam it concrete sub base, you could just increase insulation depth and...
GYVLON FLOW CONE SET
Hope this helps. Its always worth checking the load arrives in spec as a dry load may affect the finish quality and a wet load will lead to problems such as extended drying times, excess laitence etc etc
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