Laying concrete floors over different sub base?

[thompo]

#Edit- reposted in building#

Hello

Having finally removed all the suspended timber floors we have discovered a mixture of sub bases in the void.

2 rooms + hall way are just soil and the remaining rooms have a thin concrete oversite. Now i have a couple of questions on how to proceed.

Is it ok to pack rubble/fill in on top of the bare soil? (Sand/DPM/slab/insul/VCL/screed to follow)

Would i be better breaking up the exisiting oversite concrete and compact the whole lot?

The rooms with soil will need approx 500mm of fill and the other rooms just 200mm.

Thanks for any info.

Cheers Neil

 

[mac391]

If you are planning to have a solid concrete floor as you finished floor level you will bridge your existing dampcourse and will have to install a new one.