Hello everyone,
I hope someone can help me here.
Recently, our concrete slab was poured – we don’t have a basement. Around the slab, a frost protection edge with a depth of 93 cm (37 inches) was installed. Three empty conduits were routed outside under the slab. Two of these are KG2000 pipes, and one is a Kabuflex pipe.
For the KG2000 pipes, collar sleeves were installed before the slab was poured. Unfortunately, this was forgotten for the Kabuflex pipe.
Here is a picture showing the situation before pouring:
And here is a picture of how it looks now:
The empty conduit exits the building about 20 cm (8 inches) below ground level.
Because the collar sleeve is missing, we are concerned that water might later enter the house at this point.
My understanding is that, due to the frost protection edge, water cannot accumulate under the slab, so water from beneath the slab cannot enter the building at the edge of the conduit.
Is that correct?
Therefore, the only potential source of water ingress would be at the point where the conduit passes through the edge of the slab.
Is there a way to seal this conduit exit afterwards?
Around the house, a 30 cm (12 inches) wide and 10 cm (4 inches) deep layer of gravel will be laid.
Would it help to make this gravel layer 20 cm (8 inches) deeper at the point where the conduit exits, so that the conduit would exit within the gravel layer?
I hope someone can help me here.
Recently, our concrete slab was poured – we don’t have a basement. Around the slab, a frost protection edge with a depth of 93 cm (37 inches) was installed. Three empty conduits were routed outside under the slab. Two of these are KG2000 pipes, and one is a Kabuflex pipe.
For the KG2000 pipes, collar sleeves were installed before the slab was poured. Unfortunately, this was forgotten for the Kabuflex pipe.
Here is a picture showing the situation before pouring:
And here is a picture of how it looks now:
The empty conduit exits the building about 20 cm (8 inches) below ground level.
Because the collar sleeve is missing, we are concerned that water might later enter the house at this point.
My understanding is that, due to the frost protection edge, water cannot accumulate under the slab, so water from beneath the slab cannot enter the building at the edge of the conduit.
Is that correct?
Therefore, the only potential source of water ingress would be at the point where the conduit passes through the edge of the slab.
Is there a way to seal this conduit exit afterwards?
Around the house, a 30 cm (12 inches) wide and 10 cm (4 inches) deep layer of gravel will be laid.
Would it help to make this gravel layer 20 cm (8 inches) deeper at the point where the conduit exits, so that the conduit would exit within the gravel layer?
A
Allthewayup14 Feb 2024 09:49Whether water collects beneath the foundation slab or not has nothing to do with the substructure but depends on the design flood level used. In theory, during a flood, water is present all around and beneath the house.
Is the construction more advanced than in your photo? Who is responsible for the waterproofing? Have you already spoken with the contractor responsible? If yes, what did they say? If not, why haven’t you addressed it?
Is the construction more advanced than in your photo? Who is responsible for the waterproofing? Have you already spoken with the contractor responsible? If yes, what did they say? If not, why haven’t you addressed it?
According to the soil report, the design water level is at ≤ 157.87 m NHN. The outlet of the empty conduit is approximately at 158.28 m NHN.
I thought the frost skirt prevents water from getting under the foundation slab. How exactly does the frost skirt stop water from freezing?
Our plot is on a small hill – so I consider flooding unlikely.
Construction is already somewhat advanced. The bitumen membrane has been glued over the foundation slab, and the house has been set in place. Otherwise, nothing has changed on the ground.
The empty conduits were installed by the foundation slab contractor. Therefore, I consider them responsible. Of course, we have already informed them but have not yet received any feedback. I wanted to gather some information in advance about what consequences this could have for us or if it is not as serious as I think.
I thought the frost skirt prevents water from getting under the foundation slab. How exactly does the frost skirt stop water from freezing?
Our plot is on a small hill – so I consider flooding unlikely.
Construction is already somewhat advanced. The bitumen membrane has been glued over the foundation slab, and the house has been set in place. Otherwise, nothing has changed on the ground.
The empty conduits were installed by the foundation slab contractor. Therefore, I consider them responsible. Of course, we have already informed them but have not yet received any feedback. I wanted to gather some information in advance about what consequences this could have for us or if it is not as serious as I think.
Now we have received feedback from the foundation slab contractor.
He says we are above the groundwater level, so it can only be rainwater in our case, and rainwater is not pressurized.
Therefore, he will not take any further action.
He also mentioned that in buildings without basements, wall collars are often not installed even on the sewer pipes.
He says we are above the groundwater level, so it can only be rainwater in our case, and rainwater is not pressurized.
Therefore, he will not take any further action.
He also mentioned that in buildings without basements, wall collars are often not installed even on the sewer pipes.