I have a floor to overboard, UFH and tile in an old farmhouse. Currently there are t&g floorboards, the odd loose one but on the whole not too bad. The guy has got a Matki tray down.
As you can see from the small diagram at the bottom of page there is a lip that i need to get up to. The height is roughly 30mm from the t&g, prehaps a touch more.
Was thinking, 12mm ply, 6mm insulation, UFH, leveller and tile (8mm) SPF ?
Any suggestions / advice please, thanks.