WU concrete - compression during the construction phase

Neither is the black tank a permanent, practical solution against pressing water, nor is drainage a universal cure-all.

In the soil report, a recommendation for the basement construction method is usually given. No engineer will recommend a black tank as sufficient when dealing with stagnant/pressing water, whether it is groundwater, stratified water, or seepage water. Modern solid houses have a design half-life of over 80 years. There is no room for "tinkering" in the basement. Every geologist, architect, expert, and engineer plays it safe here and recommends the white tank.

Without knowing the soil survey, I would assume that this concerns "temporarily pressing water," i.e., stagnant water caused by precipitation events. If I am mistaken, please feel free to post the relevant section from the report.

Different options can then be chosen for waterproofing...

1: If a perimeter drainage according to DIN 4095 is planned, all earth-contacting components must be sealed according to DIN 18533-1:2017-07 to W1.2-E (soil moisture). The permanent functionality of the drainage must be guaranteed at all times.
-So, a drainage and a bitumen coating. The tricky part is that this only works as long as the drainage functions without interruption. I would generally only recommend this in certain cases and on sloped terrain.

2: Alternatively, reference is made to DIN 18533-1 W2-E. Here, the maximum embedding depth of the lower edge of the basement floor slab is distinguished:
For basement floor slab lower edge < 3 m, DIN 18533-1 W2.1-E "moderate impact of pressing water"; situation 1 from stagnant water - "temporarily pressing water" applies.
-The waterproofing for W2.1-E can be done with bitumen and polymer bitumen membranes, plastic and elastomer membranes, or PMBC.

3: Alternatively, a watertight concrete construction according to the DAfStb guideline (WU guideline, German Committee for Reinforced Concrete) is also possible. Here, at least stress class 1 (pressing water) must be applied.
-This is then the white/grey tank. If executed correctly, the permanently "safest option."

Since variant 3 was executed incorrectly here, I could already imagine an additional drainage to prevent water from reaching the house wall at all. As already described, insist on an extension of the guarantee.

The black tank is permitted according to DIN 18533, and there are plenty of products with corresponding approval for W2.1E. The statement is nonsense in this absoluteness. At least the engineers from Weber, PCI & Co will recommend their products to you. Whether it is the best solution can certainly be discussed. But it is certainly better than a leaking WU basement.

Hello,

we have already discussed this before in the topic. Of course, a [weiße Wanne] is the right solution, but it is simply faulty and no one will tear down the house anymore.

Therefore, the [schwarze Wanne] could be the solution. It is also permissible with temporarily pressing water.

Regards

It may all be true about the great products and their building authority approvals. But how long do the manufacturers guarantee them (and how long will the house stand), and how high is the risk of incorrect installation, etc.? A drainage system is difficult to impossible to install in cohesive soils such as clay, because the house must effectively be surrounded by a gravel layer from below the base slab up to the finished ground level. Over the years, the gravel will then be washed away again. A geotextile may delay this somewhat, but once compacted and built over, it is no longer effective. In this region, a retention structure was built many years ago. The groundwater level slightly rose, and since then hundreds of basements have been wet, some of which are houses less than 20 years old with a black tank waterproofing system installed. Some remained dry (presumably due to flawless execution), but many were unlucky.

For me, under the given circumstances of the original poster, a black tank is a no-go. Hopefully, the injection of the waterproof concrete construction will succeed for the original poster, and only a compensation will be negotiated. An alternative waterproofing by means of a black tank is more likely to backfire on him than the injected waterproof concrete.

How long does the concrete plant provide a warranty? And how long does the manufacturer of the injection material? It may be that the solution is not ideal, but a concrete cellar with professionally applied PMBC will last a very long time. The sealing is additionally protected by the insulation in this case. If the load case is W2.1E, no drainage is needed either.