ᐅ Insulating the bathroom floor

Hello everyone!
I cannot insulate my bathroom from the basement and now want to do it under the floor tiles instead. Which material would you recommend? It will of course reduce the ceiling height, so the thinner, the better.
Thanks and best regards

Hello,

a bit more information would be really helpful.

Olli

Well, vacuum insulation panels would be the thinnest option, but they need to be installed by a professional company. That would be 2cm (about 0.8 inches) plus a screed of 2.5cm (about 1 inch) for the drywall construction.

Describe your floor construction. It sounds like you do not want to remove the screed (or whatever the current floor covering is).

PUR boards are suitable; they are not as thin as vacuum insulation panels but noticeably thinner than conventional materials. The supplier of the PUR boards can calculate the U-value (thermal transmittance) for you. Ideally, you should aim for the legal requirement (U = 0.30), with at least 4 cm (1.6 inches) of insulation thickness; otherwise, you won’t see a significant effect.

All the best

Susanne Junghans

Hello,
first of all, thank you for the advice! More information: My house is older than 1945, built with a steel beam and concrete structure, which contains a high proportion of sand and some small stones. The screed needs to be removed; it mainly consists of sand... Currently, the water pipes are embedded in it and will also have to be removed. Removing it will not affect the height; there will definitely be a step to the adjacent room due to the insulation because the floor will be retiled. The entire house is meant to meet KfW standards, the consultant says there is some flexibility here and there, and the architect believes that the space below still allows room for a thin layer of insulation. So, the plan is to add insulation from above and below, according to him.