Hi currently have radiators off boiler. knocking out rooms and extending to provide large kitchen din lounge. Pulling up carpets and underlay and 22mm floor boards found a concrete slab over existing building. I assume i have approx 40mm for ufh and 10mm tile. Is that enough for ufh? Can i get kit and connect everything except manifold and boiler side? The boiler is in the kitchen one of the rooms to be heated, what would i need and what do i need prof to do? If i heated the open area approx 65m2, im also putting on a new hall would it be better to rip up floors on all of ground floor and take out existing rads and extend ufh? We sleep downstairs so upstairs rads would only be on occasionally to stop damp and once in blue moon for guests? Or keep rads in snug hall and bedroom where rapid heat increase/decrease might be useful?