ᐅ Cutting open the concrete slab due to incorrectly installed drainage pipes
Created on: 5 Nov 2018 19:13
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Heik0
Hello everyone,
I am new to this forum and have become quite frustrated today regarding our house construction. We are currently building a single-family bungalow with an architect and separate contracts for the trades. The foundation slab and masonry work are being done by the same company.
Today, the first outer row of bricks was laid on the foundation slab. It was then discovered that the three drain pipes from the guest bathroom (sink, toilet, shower) were all installed 70cm (28 inches) too far to the left. The drains from the toilet and sink are now located in the hallway, and the shower drain is directly in front of the bathroom door. The architect says this is not a major issue. For the sink and toilet drains, they plan to cut into the slab and reposition the pipes 70cm (28 inches) to the correct location within the slab. For the shower, there seems to be some other solution. The architect assures me this poses no structural problem. It should be noted that we do not have strip foundations, but a base layer of 25cm (10 inches) foam glass gravel, followed by a 25cm (10 inches) load-bearing slab made of waterproof concrete.
I am paying the architect for construction supervision (phase 8), and yet something like this happens—this shouldn’t be the case. He said that when he inspected the site, there was no formwork board at that location for the slab, so he couldn’t measure it then. Of course, he measured everything else beforehand.
What can and must I do now? Is this really harmless? What rights do I have, and what should I pay attention to in order not to make a procedural mistake? Should I file a defect notice? Document everything? Request a new structural analysis? Do I have to accept it as is? Why build a 25cm (10 inches) slab with reinforcement if it can be cut open and removed without issue in some places?
Best regards,
Heiko
I am new to this forum and have become quite frustrated today regarding our house construction. We are currently building a single-family bungalow with an architect and separate contracts for the trades. The foundation slab and masonry work are being done by the same company.
Today, the first outer row of bricks was laid on the foundation slab. It was then discovered that the three drain pipes from the guest bathroom (sink, toilet, shower) were all installed 70cm (28 inches) too far to the left. The drains from the toilet and sink are now located in the hallway, and the shower drain is directly in front of the bathroom door. The architect says this is not a major issue. For the sink and toilet drains, they plan to cut into the slab and reposition the pipes 70cm (28 inches) to the correct location within the slab. For the shower, there seems to be some other solution. The architect assures me this poses no structural problem. It should be noted that we do not have strip foundations, but a base layer of 25cm (10 inches) foam glass gravel, followed by a 25cm (10 inches) load-bearing slab made of waterproof concrete.
I am paying the architect for construction supervision (phase 8), and yet something like this happens—this shouldn’t be the case. He said that when he inspected the site, there was no formwork board at that location for the slab, so he couldn’t measure it then. Of course, he measured everything else beforehand.
What can and must I do now? Is this really harmless? What rights do I have, and what should I pay attention to in order not to make a procedural mistake? Should I file a defect notice? Document everything? Request a new structural analysis? Do I have to accept it as is? Why build a 25cm (10 inches) slab with reinforcement if it can be cut open and removed without issue in some places?
Best regards,
Heiko
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Bauling20187 Nov 2018 18:44Here is the solution:
The construction company made two core drillings into the slab and inserted pipes. From the outside, they dug a hole and pushed a pipe under the gravel towards the core drilling. They did this twice. This was for the toilet and the washbasin. For the shower, we are installing a side drain; we have already gained 40cm (16 inches), and for the remaining 30cm (12 inches), they will remove some concrete without cutting any rebar. The rest will be embedded in the 6cm (2.4 inches) insulation on the floor.
The construction company made two core drillings into the slab and inserted pipes. From the outside, they dug a hole and pushed a pipe under the gravel towards the core drilling. They did this twice. This was for the toilet and the washbasin. For the shower, we are installing a side drain; we have already gained 40cm (16 inches), and for the remaining 30cm (12 inches), they will remove some concrete without cutting any rebar. The rest will be embedded in the 6cm (2.4 inches) insulation on the floor.
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Caspar20207 Nov 2018 18:57Bauling2018 schrieb:
Dug a hole from the outside and pushed a pipe under the gravel towards the core drilling.And hopefully properly sealed as well...
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Bauling20187 Nov 2018 19:04Where exactly do you mean to seal? Under the slab, there is 25 cm (10 inches) of glass foam gravel — capillary-breaking. The original pipes were also not specially sealed towards the concrete,
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