Floor slab concrete before tiling

[ollyfly]

Hi there,

Background: My house hallway is being renovated. I have removed a layer of original victorian tiles (unfortunately heavily damaged) and now revealed the original Yorkshire Stone slabs - see image.

//media.diynot.com/40000_39785_64107_45841523_thumb.jpg

I intend to lay a replica victorian floor but first must get the floor ready.

Questions:

- If i remove the Yorkshire stone floor what must I do to prepare it for the tiles? Dig down? Damp proof? Hardcore? Concrete? Screed? What should i use?

- Or is it possible to screed directly over the stone floor and lay tiles on top? Possible cracking later on?

Any help much appreciated.

Olly

 

[noseall]

It depends what you want to achieve.

As long as the sub-floor is sound and there is enough depth for a membrane and a decent thickness of screed then it will be ok.

However, do you want to insulate the floor? Are there any signs that the floor has sunk? Any hollow spots?

 

[ollyfly]

Hi, cheers for the reply.

The floor has some visible subsidence which looks like it occurred a long time ago - the house is 200 years old. I think i might have to add a damproof layer and some insolation to be on the safe side.

If i do remove the stone flags it will be earth underneath. I'm guessing i'll have to dig down, lay compacted hardcore, then some sand, then a damproof layer, then alittle more sane and then a concrete screed. Is that correct?


Also, the flooring is 15m2 total area so:

How far do i need to dig down?
How much hardcore should i buy to fill the hole?
Where can i buy it from?

Appreciate any help you make have,

Cheers Olly

 

[saladdays]

How thin can screed be applied? 15mm?

 

[ollyfly]

Yes 15mm of screed all over would work. I'm thinking about removing the Slabs though now as I believe they are worth rather a lot on money.

 

[AdamCH]

Yes 15mm of screed all over would work. I'm thinking about removing the Slabs though now as I believe they are worth rather a lot on money.

Be a crime to tile over them.