Hello everyone,
this is about the method our house builder is using to create a waterproof basement. To be honest, I have never heard of this before, and there is very little information available online about it... and what there is mostly relates to commercial or office buildings.
The method is called "fresh concrete composite membrane" (FBVK #waterproof) with double-layer exterior walls 20cm (8 inches) thick.
One step down would be the "WU-basement" with double-layer exterior walls 24cm (9.5 inches), joint flashing. Of course, this option is also cheaper (approx. 3,000 €).
The plan is to set up a home office in the basement. Therefore, we would prefer it to be "properly sealed," ideally without high humidity caused by water-resistant concrete.
A soil report is not available yet!
Are you familiar with the first method? Have you had any experience with it or any opinions?
It would also be interesting to know whether insulation is possible at all if there is a "membrane" facing the soil on the outside.
this is about the method our house builder is using to create a waterproof basement. To be honest, I have never heard of this before, and there is very little information available online about it... and what there is mostly relates to commercial or office buildings.
The method is called "fresh concrete composite membrane" (FBVK #waterproof) with double-layer exterior walls 20cm (8 inches) thick.
One step down would be the "WU-basement" with double-layer exterior walls 24cm (9.5 inches), joint flashing. Of course, this option is also cheaper (approx. 3,000 €).
The plan is to set up a home office in the basement. Therefore, we would prefer it to be "properly sealed," ideally without high humidity caused by water-resistant concrete.
A soil report is not available yet!
Are you familiar with the first method? Have you had any experience with it or any opinions?
It would also be interesting to know whether insulation is possible at all if there is a "membrane" facing the soil on the outside.
Specifications according to the offer are mentioned in the first post. Here is a summary again:
WU-BASEMENT
Version with FBVB (fresh concrete composite membrane)
Doing it yourself (or having it done) is unfortunately not an option, as this is a prefabricated basement and only available as a complete package
WU-BASEMENT
- Exterior walls 24cm (9.5 inches)
- Foundation slab 25cm (10 inches)
- Joint sheets in all component joints
Version with FBVB (fresh concrete composite membrane)
- Exterior walls 20cm (8 inches)
- Foundation slab 25cm (10 inches)
- Water pressure-resistant basement windows (up to 80cm (31.5 inches) water column)
- Sealing with the mentioned membrane
- Additional cost of about 3000 Euro
Doing it yourself (or having it done) is unfortunately not an option, as this is a prefabricated basement and only available as a complete package
I do think that these membrane systems have a long lifespan.
They are also commonly used in higher-quality commercial or public construction projects. However, it’s probably difficult to find detailed information or definitive statements about them—similar to watertight concrete (WU concrete), I would guess. A crack after 10 years, and suddenly water gets in :-/
Still, there are a few things I definitely want to clarify with Schwörerhaus. Thanks again for the feedback!
They are also commonly used in higher-quality commercial or public construction projects. However, it’s probably difficult to find detailed information or definitive statements about them—similar to watertight concrete (WU concrete), I would guess. A crack after 10 years, and suddenly water gets in :-/
Still, there are a few things I definitely want to clarify with Schwörerhaus. Thanks again for the feedback!
In both quotes, the waterproof concrete seems simply too thin, doesn’t it? It should be 25cm (10 inches), preferably 30cm (12 inches). No wonder they still need a membrane there... There should be a processing guideline or something similar for waterproof concrete; try googling it.
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