Concrete depth (unidrain)

[jonil152]

Hi Working in a basement. Chipped away 15 square meters of concrete. To be backfilled with 10 cm of macadam, 15 cm of insulation, underfloor heating (water) 7 cm of concrete. Now to the question. Unidrain wall-mounted drain wants about 2-3 cm slope toward the drain. Then the concrete becomes quite thin at the back. Are there stronger materials to use for the slope? Regards, Johan

 

[C.Lundin]

70 mm concrete in itself is already borderline, any thinner won’t work. Even without underfloor heating, it's tight with the cover layer, reinforcement, and ballast. I would have considered another solution or possibly dug further.

Edit: Realized I might have phrased it a bit strangely. No need to cover any ballast, if it could be interpreted that way.

 

[basseman]

Replace some of the macadam with isodrän or pordrän so you can get thicker concrete while maintaining the same thickness of the insulating layer
https://www.isodran.se/uploads/5914a99f788a4ed37dfb2be68e4653fc.pdf