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dbr
For anyone interested in DIY underfloor heating install in an existing concrete floor...
I worked out that the blades of a cut and break saw were spaced wide enough to accommodate a 16mm ufh pipe quite comfortably, I rented it for a day and probably only needed it for half the day tops for this bit...
It's an extremely messy and dirty job, it's a trade off between keeping everything wet enough to stop dust rising and having concrete mud splattered everywhere by the blades. I suspect with very thorough preparation that could be managed though but in this instance the whole lot is being redecorated so I don't mind.
I used levelling compound to fill in around the pipes before tiling...