And that is exactly the minimum thickness needed to make the wall watertight. With WU, the tightness is achieved through the thickness of the material. WU itself is watertight but still vapor-permeable. Is there going to be anything applied outside? Because of residential use and such?
Thanks for the info regarding material thickness – are there documents or DIN standards available on this?
What do you mean by outside? The basement is clad with "perimeter insulation." Those are polystyrene panels, 12 cm thick. How does that relate to residential use?
1) Electrical wiring inside the basement interior walls
I have already relocated it as much as possible; only for the main office room this is only very limitedly possible.
2) Installation level on the exterior walls (which has the advantage that the concrete look/comfort is significantly improved; but should be planned by a professional because of the aforementioned vapor permeability of WU)
That sounds very good in the first place – comfort is always good. I am an amateur in this regard – isn’t such a basement otherwise ‘comfortable’? I am assuming the basement walls are ‘normally’ plastered... Where can I find info regarding such installation layers? The concrete seems to want to “breathe,” right?
3) Have thicker exterior walls built
That is too late; we are just beginning sanitary installation.
It depends. Depending on the manufacturing method and exposure class, at least 24 cm is also recommended.
For example, with groundwater pressure and in-situ concrete.
Where can I find information about the exposure classes, etc.? Honestly, I don’t even know if we actually need a WU concrete basement at the site – I was told the builder just uses it in principle for all houses.
There are standard and deep flush-mounted boxes. For 1 to 2 cables you can use standard ones; for more cables and possibly certain inserts, deep boxes have to be used. Don’t forget cable routing on/in concrete walls.
If there is only one wall per room, maybe drywall it and install the flush-mounted boxes there.
Hm, but doesn’t that rule out furniture mounting on that wall as well? The problem is also that one of the exterior walls has a fan installed...
I have the same situation; I also have no flush-mounted boxes in the WU exterior walls. I have planned most of the electrical installation in the masonry interior walls as much as possible. However, only one room of my basement will be made more comfortable; there I will probably drywall the exterior walls with Fermacell. There are some that already have a thinner polystyrene layer on them, which then is sufficient for standard hollow wall boxes. There are also baseboard ducts where cables can be accommodated along with compatible sockets, etc., so that everything appears seamless. In an office room, dado trunking makes sense in certain places because many sockets, LAN, etc. are needed and some flexibility is desired.
Is the “breathability” of the WU concrete still ensured with this?
You may have noticed I am an amateur in this regard... that’s actually why we decided on a turnkey construction...