Failed tightness test - who is liable?

Hello,

I hope you can help me. We had a detached single-family house without a basement built in August 2014. The concrete slab, pipes, etc. were done by the builder. We moved in April 2015 and have now had to undergo a leak test. Unfortunately, we did not pass this test, but we have no information yet on whether a seal or a pipe may be defective. Of course, we have already completed the outdoor facilities, etc. This means you can't just dig up to fix the "damage." Now the question: Who is financially responsible for fixing the error (in full)? Is it our personal bad luck, or can we hold the builder accountable? This does not only refer to "digging up" and possibly replacing the defective pipe but also to the resulting damage to terrace, paving, garden, etc.

I would be very happy to hear your opinions.

Kind regards

Modjo

what exactly is not "sealed"? Is moisture entering the house?

It depends on what the warranty situation is like for you...

Hello,

I am not exactly sure about that. I don't think moisture is penetrating. According to the test report, the following is stated:
Pipes 30 meters long DN 125 (mixed water)
Test duration 30 minutes
Water loss: 3.8 liters

He said the boss has to calculate that, but he thinks that is too much.
The tightness test of the external channel was okay.

He inspected it beforehand with the camera and found no "damages". He suspects that some gasket somewhere "might" not be seated properly.

I don't know more. Is there a way to calculate ourselves where the limit values are?

Regards

I have found the following calculation, I hope I researched correctly:

d= 0.125 (DN125)
L= 30 meters
Water loss limit: 0.1l m³ (DIN EN 1620 + DWA-A 139)

F= 0.125 x PI x 30 = 11.78m²
V= 11.78 x 0.1 = 1.18 liters

According to (if calculated correctly) there should have been only 1.18 liters of water loss.

I hope I miscalculated and the limit values are higher :-(
Regards

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