concrete slab/floor

2 Jan 2015
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United Kingdom
Away to lift a floor in the house (was a kitchen originally but changing it to a living room) current make up of floor is flagstones, covered with bitumen resin then a 40mm screed.

I propose to lift existing, scrape it back a bit, lay 25mm sand blind, Dpm, 75mm kingspan then a concrete slab made with 10mm ballast onto which I'll directly lay my finished floor (underlay and engineered oak) I don't want to have to lay a screed on top of concrete.

My question is what minimum thickness of slab would I get away with and would it have to be reinforced?

Thanks for any help
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100mm min. and no reinforcement necessary but you could use mesh if you feel its needed.

Use delivered and barrow'ed-in pour, its much easier.

remember to use edge insulation between the slab and the surrounding wall.

You must work to the FFL line.

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