Preparing subfloor and 25mm screed - some guidance please

23 Jun 2008
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United Kingdom
Our house, built in the eighties, has a concrete ground floor The screed is 25mm thinner in the kitchen and has had quarry tiles laid that bring the floor level up to the same as the rest of the building.

We're planning to lay an engineered oak throughout the rest of the house, thickness including underlay is 25mm, and in the kitchen we're removing the quarry tiles and laying Warmup insulation boards, electric ufh (supplementry rather than main heat source) and re-tiling. The thickness of that also comes to 25mm.

Having removed the quarry tiles, we have the top of the original screed with the remains of the tile cement. We're about to lay a 25mm screed on top of the original screed, and my question is what's the best method of doing that, ie what preparation of the subfloor surface, any particular manufacturer's prep or simple PVA?

Any additives that we should add to the mix for the thin screed, such as some of the latex additives that F.Ball produce? Would anyone recommend a technique for ensuring levelness? Apply self-levelling compound or use the tile adhesive between subfloor and insulation board, and between insulation board and tile to reach flat and level?

In short, any advice gratefully accepted. We would go ahead and just lay and float 6:1, but I'm sure there are other better approaches, and I'd like to hear them if anyone is willing to share.
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