ᐅ Sewer pipe installed below the frost protection barrier (frost skirt).
Created on: 10 Sep 2022 21:40
C
clatimoWe are building a bungalow. When the house’s wastewater pipe was supposed to be connected to the sewage system (about 70cm (28 inches) too deep, so we were advised to install a lifting station – which we declined due to the electricity costs), we dug new trenches ourselves and discovered that the wastewater pipes were laid through the frost protection foundation. Additionally, the pipes were sealed with expanding foam, which is now crumbling out. Can anyone provide some insight on this? What could happen in the worst case? We are at a loss.
Hello,
I assume the pipe is not now located 80cm (31.5 inches) below ground level, right?
I consider the penetration through the frost protection strip to be structurally, like a thermal bridge, not particularly significant. Normally, pipes should also be frost-free, so around 80cm (31.5 inches) above ground level.
Here we only see a drop that protrudes a few centimeters (inches) outside the building. Based on what can be seen here, I wouldn’t worry too much.
How many centimeters (inches) are there between the pipe and the ground surface?
Best regards,
Jann
I assume the pipe is not now located 80cm (31.5 inches) below ground level, right?
I consider the penetration through the frost protection strip to be structurally, like a thermal bridge, not particularly significant. Normally, pipes should also be frost-free, so around 80cm (31.5 inches) above ground level.
Here we only see a drop that protrudes a few centimeters (inches) outside the building. Based on what can be seen here, I wouldn’t worry too much.
How many centimeters (inches) are there between the pipe and the ground surface?
Best regards,
Jann
Hello, thanks for your response. The wastewater pipe from the house is buried at a depth of 1.50 m (5 feet). However, since we want to add about 20 cm (8 inches) of fill, it will then be at around 1.70 m (5.6 feet). I had read that water can be washed under the foundation if the foundation skirt, as in this case, is damaged. I am not a professional.
For water to cause any undercutting, there must be a current.
What is your usual groundwater level?
At the moment, I wouldn’t share the concern.
At that depth, you might consider wrapping the section of pipe with light insulation.
The house was probably built recently, right?
In that case, I would simply notify the construction company in writing. That at least gives you a record.
This falls under the warranty period and, even after handover, the burden of proof lies with the construction company, since you wouldn’t have been able to raise this pipe afterward.
But I would try to ease your major concerns about soil failure.
Best regards
What is your usual groundwater level?
At the moment, I wouldn’t share the concern.
At that depth, you might consider wrapping the section of pipe with light insulation.
The house was probably built recently, right?
In that case, I would simply notify the construction company in writing. That at least gives you a record.
This falls under the warranty period and, even after handover, the burden of proof lies with the construction company, since you wouldn’t have been able to raise this pipe afterward.
But I would try to ease your major concerns about soil failure.
Best regards
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