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We are digging it up and relaying it deep enough for the underfloor heating to be laid and then reconcreting/screeding on top. So, I guess it is better to say that the top layer of concrete and screed will be consistent across the whole area, but the hard core base of some of it will be 25 years old

Thanks again for this. We are having under floor heating on all the concrete, new and old and you are correct that we do not want a break in the tiling. Your suggestion that the vulnerability is between the old and new concrete feels right, but the additional cost is very significant (and a...

.....and many thanks for taking an interest, I am a novice at this

Picking up the points you made 1. How long has the concrete been down ? A few weeks for some of it, rest 25 years, sectioned off by room rather than within room 2. Was it a pumped screed, or was it a normal sand\cement one? The recent concrete came made up in a mixer if that is...

We are in the middle of a refurb and have a concrete kitchen floor with under floor heating which we are planning to lay porcelain tiles onto. We have just been told that we will need to lay Ditra matic under the tiles. Given concrete is pretty solid and the additional cost for laying Ditra...