ᐅ Perimeter insulation for properties with boundary-adjacent construction

Created on: 24 Sep 2018 21:03
D
Dampfhammer
Hello,

we are building a house with a basement, and it is a party wall construction. The problem is that one wall of the basement partly borders the neighbor’s basement and partly a wall with a foundation and soil underneath. In short, it is not possible to create a working space to apply the insulation.

Therefore, my question is: is there a technique where, after excavation, the perimeter insulation / bituminous coating is applied first and then the basement wall is constructed? The plan was to build the basement using formwork, not a precast basement.

I hope I have explained myself clearly :-)
L
Lumpi_LE
25 Sep 2018 09:11
No, waterproof concrete or a sealant that can also be applied beforehand.
B
Bookstar
25 Sep 2018 11:05
You don't necessarily need the black coating for waterproof concrete. Only a small amount of water vapor passes through by diffusion—amounts comparable to a shot glass—which is not an issue with normal ventilation.

And in this case, the XPS boards are firmly bonded to the concrete, so it should matter even less.