ᐅ Sealing Basement Walls – Perimeter Drainage with a Sump Pump?

Created on: 13 Sep 2017 13:29
J
jfwes
Hello,

I’m not sure if my topic fits here exactly. It’s not precisely about insulation, but it’s the same principle: it concerns the basement wall.
My builder suggested installing a perimeter drainage system with a sump pump around the basement. The basement is planned to be used as an office, which of course should remain dry.
My building expert recommends a waterproof concrete tank (white tank) according to load case 6. However, my builder considers that completely excessive.
Could you give me advice on how to waterproof a basement effectively without going overboard? I’m not aware of any particular moisture issues in the soil.
Thank you.
W
Wastl
14 Sep 2017 07:52
jfwes schrieb:
uh... there isn’t one. 🙂 the general contractor (turnkey) says he has built in the area before and doesn’t need one...
That’s nonsense... Maybe there’s a water vein running right beneath your property at a depth of 2.5 meters (8 feet)?
Is it really worth risking that just to save 1,500 €?
A waterproof concrete shell is only effective if combined with waterproof windows and light wells that are also sealed, which in turn require additional drainage. That can get quite expensive, especially for an office building (probably planned with large windows).
C
Caspar2020
14 Sep 2017 08:03
jfwes schrieb:
My building surveyor recommends a waterproof concrete shell (load case 6). However, my construction company thinks this is completely over the top.
Can you give me advice on how to waterproof a basement sensibly without going overboard? I am not aware that the soil is particularly damp.

If you don’t know the soil condition, I’m on the side of the building savings contract.

We don’t need drainage or any other special measures. The basement is dry.

If your builder is already suggesting that, the soil might not be entirely ideal....