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Raising an existing concrete floor that's lower than rest of house

Postby Mistyderek » Fri Oct 01, 2021 9:24 pm

I am renovating a house . There is an extension which has a 3m by 4m floor approx 200 mm lower than the rest of the house. It is a concrete slab topped with 25 mm of polystyrene and chipboard.

I am thinking about how to raise it 200 mm reasonably efficiently...Possible options [1] celotex then screed [2] two layers of celotex then chipboard and [3] 100mm kingspan then aircrete blocks laid flat with sand /cement brushed into joins..sort of like block and beam...what do people think?
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Postby stoneyboy » Sat Oct 02, 2021 10:51 pm

Hi Mistyderek,
Suspect it will come down to cost and convenience. I would choose 180mm expanded polystyrene topped with 22mm t&g chipboard sheets.
Regards S
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Postby Mistyderek » Sun Oct 03, 2021 7:25 pm

Yep, I think so as long as the BCO will live with it.
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Postby stoneyboy » Mon Oct 04, 2021 2:14 pm

Hi mistyderek.
You may have to incorporate a DPM if there is not one.
Regards S.
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