Folks This may not be the right Forum to post this on but I'm sure some of you will be knowledgeable in this field?! I have been asked to prep a kitchen prior to installation of some fancy units etc. The floor tiles tiles are 600 x 900 x 15 polished limestone so my first question is will 4" grinder or Sigma touch these? Secondly & most importantly is the floor prep! The current floor 'make up' is as follows 20mm Quarry tiles 70 sand/cement (or poss concrete) DPM Compacted earth! The building is circa 1540's which explains a lot! Anyway the customer is also wanting UFH but can't afford to raise the floor height. What would you recommend? My thoughts are as follows. 15mm Tile 3mm Adhesive 35mm Liquid screed (encapsulating UFH) Polythene 35mm Celotex DPM Any advice/recommendations would be awesome....thank you!