ᐅ Moisture Sealing of the Concrete Slab

Created on: 3 Feb 2020 13:01
T
trksglm
Hello everyone,
for better moisture protection, the waterproof membrane will then be extended up along the exterior walls, similar to a basin.
When I mentioned this to the builder, they responded:
the waterproof membrane will NOT be extended up the exterior wall.

The installation complies with the requirements of the DIN standard.

How necessary is this? Should I insist on having the membrane extended up the wall?

Corner with white tiled walls, dark, dirty floor and moisture at the base.


Corner: white wall meets gray tiles, dark floor; dust, stains and chipping at the base.


Empty room with white wall blocks and dark gray floor.
N
Nordlys
3 Feb 2020 16:39
It is not necessary. The flashing only needs to slightly overlap the material beneath the walls. This way, everything will be sealed properly.
T
Tx-25
5 Feb 2020 15:28
Nordlys schrieb:

It’s not necessary. The membrane just needs to slightly overlap the material under the walls. That way, everything is sealed – and good.
Does this mean that no adhesion is required between the damp-proof membrane and the wall barrier? That would also explain why many membranes only have adhesive strips on the sides. So, the front edges are not glued.
N
Nordlys
5 Feb 2020 22:25
That will be welded. Or am I misunderstanding something?
B
Bookstar
5 Feb 2020 22:41
I always wonder what the point of that is—where is the moisture supposed to come from?
N
Nordlys
5 Feb 2020 22:44
Oh, believe me, a C20/25 concrete slab is not waterproof. Water will seep through from underneath or the sides. That’s why a barrier is necessary.
B
Bookstar
5 Feb 2020 22:56
Nordlys schrieb:

Oh, believe me, a C20/25 concrete slab is not waterproof. Water will seep through from underneath or from the sides. That’s why you need a barrier.
So why is such a barrier not always necessary for waterproof (WU) basements? Is that made with a different kind of concrete?