Make another attempt with a question about my floor, a bit more precise. I have a wooden floor that is quite uneven. Previously, there was a concrete slab of about 12 cm and tiles. I am now going to install waterborne underfloor heating. Between the wooden floor and the expected normal height, there is approximately 10-12 cm. How do I best level my rough wooden floor, foam board, sand, or foam beads on a ground cloth, or a thin concrete slab poured on something dense or some other good idea. The first layer will have underfloor heating, self-leveling compound, waterproofing, and tiles on it.
/Bosse
