CWatters
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How much can you raise the level by? Could you go for a suspended timber floor (needs a ventilated void underneath)?
Will it be heated to allow use as a conservatory in winter?
Brick stub walls? Foundations for those?
I share others concerns about it cracking. Best take an angle grinder to the concrete and have it out.
Typical floor slab is normally something like..
150 mm of hardcore, 25-50 mm of sand, 1200 gauge membrane (plastic sheet), 100 mm concrete slab, >85 mm insulation, 60 mm screed
With some types of insulation you can do.
150 mm of hardcore, 25-50 mm of sand, 1200 gauge membrane, >85 mm insulation, >100mm concrete (& rebar/mesh).
If you really want to leave the path then you might get away with it if you made really sure the hardcore areas were well compacted and used rebar/mesh in the concrete? The insulation would take up some movement. Don't plan on tiles though just in case.
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