Installing vinyl in a new building basement. How to make it waterproof?

Hello

I believe there is a small misunderstanding.
An overflow from the public sewer is not to be feared. The drainage of the basement runs through the pump shaft and a "loop" above the backwater level.



The scenario is that the pump shaft is filled via the drain in front of the basement outer door, the pump starts but at some point during prolonged heavy rain the water behind the loop no longer flows away because the sewer is already "full". Then, at first, the pump shaft would fill up and eventually the water, according to my humble knowledge of physics, would come through or rise at the highest point, that is through the basement door and the drain in the floor of the laundry room. That means it is rainwater. Of course, that doesn’t make things much better.

Hello " " It is -admittedly- always difficult to describe the situation precisely with few words, admittedly. The now clear situation for me was also present in my mother's single-family house built in the early 1960s. Just like the neighbors' (built identically). The problem could only be resolved by generously covering the wetted area, thus keeping rainwater away, and sealing off and deactivating the floor drain. That’s how it worked in the buildings of that time. How the scenario actually looks in practice, when the backflow pours into the basement rooms, still comes from my memory. There are, to put it mildly, some other leisure activity conditions favored by me than the necessary area cleaning :-) ------------------- Good luck: KlaRa

Don't worry so much. Just lay it on the floor and that's it. Vinyl is extremely durable. Either glue it (have it glued) or make it easy for yourself and get some click rigid vinyl with integrated sound insulation and just click it together.

We have a house from [BJ83] and have had laminate flooring for years (with a vapor barrier and 5mm XPS underneath) in the basement. No problem at all.