Raising some slate flag stones.

Ader1

OK thanks for that reply. But how about the flag stones? Should they be lifted and a dpc etc laid underneath?

cyclonebri1

Ader1 wrote: »

OK thanks for that reply. But how about the flag stones? Should they be lifted and a dpc etc laid underneath?

In an ideal world they should, but that will mean removing a fair amount of the substrate, then crushed stone and sand blinding etc on top. Then 50mm of polystyrene then the concrete then the new tiles. I don't thing you would salvage enough to replace them.
As you can see that's a lot of work and a lot of expense, so you have a choice but given you don't feel there is damp, maybe letting sleeping dogs or slates lie is the best option.
It's certainly another good reason not to run water and drain pipes below.

To do this correctly you would also need building regs approval.

Oh, yes you can just sand or emery cloth any sharp chips/corners then re-seal with a slate sealer/tile sealer.

Back to the water pipes, it's impossible to guess your layout, but is it possible to run all the pipes behind and under the units to get out or to the supply?, it's a far better option.

Ader1

I have an island in the middle of the room so I'm afraid there isn't a way around it.

I haven't seen much evidence of dampness at all on the stone floor and the place was empety for a year and the rain we had last winter makes me think that there shouldn't be too much of a problem. There was a little dampness on one wall which had lime plastering which had been covered in several layers of wall-paper. I've taken the paper off so it will hopefully allow the wall to breather as lime plaster does. Thanks for your replies.