My drain leaked from the upstairs bathroom down to the boiler room. The floor consisted of quite thick tiles, a concrete slab about 10 cm, beneath that a tar paper that goes a bit up the wall, with more layers at exposed spots, and underneath, a rather rough uneven wooden floor. The drain is level with one of the walls, there it was cast on top of insulation. Under the wooden floor, there is about 10 cm of insulation, regular insulation mat, a thin paper resting on slightly thinner joists that are the ceiling of the lower floor. The house was built in 1959. I will be closing up the floor where the drain was and will reroute the drain through the bathroom floor and the lower floor's ceiling, running it visibly in the boiler room. I plan to install a new waterborne underfloor heating system. Now to my question. How should I construct the floor, what do I place next to the rough, somewhat uneven existing wooden floor, should I lay the underfloor heating as high as possible or lower down, and what do I need for sealing before I cast, for example? I haven't done anything similar before, so any information is appreciated. Regarding the underfloor heating, is it better to lay it in ready-made panels or loose in reinforcement mesh? The bathroom floor is barely 4 m2. Grateful for tips.
/Bosse
