After an eternity using a laser and making sure we have a slope of 1cm per meter we now have the base layer done :) If I understand correctly I now need to rent a machine to compact everything tightly before putting the visqueen layer and the armature.
This is my next nemesis : routing the conduits to my basement while keeping as much as possible of the 12cm foreseen for the slab. It’s an old staircase when they still needed to shovel coal in the basement. At some point someone closed it roughly with some prefab slab. So clearance is limited if I want to keep it as is and not take it apart (which would be… a long and shifty process). I’m currently missing about 3cm. I’ll see this week if I can grind them somehow.