Suspended Floor to Solid Floor

29 Mar 2021
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United Kingdom
Hi all.

I'm in the process of planning a rear extension + integrated garage conversion.

The existing house has a suspended floor.

I'm looking at replacing the suspended floor with a solid floor such that the screed containing the UFH is a single mass (circa 100m2) through existing/garage/extension.

The void below the suspended floor is 250mm from current FFL.

Most details I've seen suggest a build up of type 1 > sand > dpm > concrete > insulation > screed.

I'm reluctant to dig down beyond the current ground level (if I don't need to), is there any combination of hardcore/sand/dpm/concrete that I can place within the remaining 100mm (given 75mm screed + 75mm insulation).? i.e. exclude the concrete slab or exclude the hardcore?

Thanks in advance
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exclude the concrete slab or exclude the hardcore?
Neither is sensible given that you don't know the make-up of the ground. You need around a minimum of 375mm (depth) to build a successful floor.
There must be a sleeper wall down there also?

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