Levelling floor

danrv

stuart45 said:

Thermoplastic.

Yes, that's what I meant. Got mixed up with the building block.

danrv

I've removed the screed layer along the crack and may need to take up some more where the carpet tape goes across.
The tiles there have a slight concave shape.

Just wondering if a basic sand/cement mix would do ok to fill and level. Considering leaving the tiles off so the mix would have to be sufficiently solid.

stuart45

How thick would the screed be?
Is that a block and beam floor?

danrv

stuart45 said:

How thick would the screed be?

17mm on this bit and assuming the same on the next row. There's brickwork underneath.

stuart45

17mm is too thin for a standard sand/cement screed. You need to add SBR to the mix.

danrv

stuart45 said:

17mm is too thin for a standard sand/cement screed. You need to add SBR to the mix.

I may try a self levelling method with a runny mix rather than manual. I only need a very small amount of SBR and this is all I can find.
Hopefully will be ok.
https://www.wickes.co.uk/KA-Bond-SBR-Co-Polymer-Bonding-Compound---1L/p/139061

Also curious as to what the brickwork underneath the screed might be.
Foundation footing strip possibly?

danrv

mexican_dave said:

Might need more than cement and sand if the cavity in the external wall needs topping up. Run a bit of dpc over the top of any bare concrete. 

I've filled in the cavity wall gap near the back with some broken bricks and smoothed over after laying a bit of dpm on top of the bricks.

I noticed after it had dried, the black plastic sheet was preventing a solid screed adhesion in one area. 
Maybe would be an idea to stick this down onto the bricks as the screed layer here is a bit thin. Originally there was clear plastic sheet which ripped when I took up the floor.

Just wondering if a bit of liquid membrane or SBR could be used on the bricks instead?

danrv

It's OK. I'll improvise.

danrv

I've filled in the two areas as best as I can. Can't do much about the floor sloping from halfway along but it's an improvement anyway.
I'll get a couple of stick down LVT samples to lay over to see how it looks.

danrv

Should be ok over the problem area once stuck down.