ᐅ Foundation incorrectly positioned – what is the recommended course of action?
Created on: 19 Apr 2022 19:47
L
lars909
Hello everyone,
Unfortunately, during our new build today, we discovered that the foundation was positioned incorrectly on the plot. The concrete slab has not been poured yet. Because an incorrect boundary marker was assumed, the foundation formwork is located 3 meters (10 feet) too far back on the property. We briefly considered accepting this and submitting a new building permit/planning permission, but ultimately decided against it due to the lack of a garden.
The site manager immediately admitted the mistake. The plan now is to move the foundation forward by 3 meters (10 feet). From what I understand, a section will be added at the front and connected to the rest. At the back, another new section will also be added and connected—the 3 meters (10 feet) of overlapping “remainder” can stay, according to the site manager, as a terrace at the level of the sliding door is planned there anyway. The wastewater pipes and other utilities will, of course, also be relocated.
I am a layperson and honestly relieved that the concrete slab hasn’t been poured yet. However, I am wondering if this is the correct approach. Or should everything actually be removed and redone? I don’t want to cause unnecessary work and am satisfied with a reasonable solution. What is structurally sound and acceptable in such a situation? How is something like this typically handled in practice?
Good luck
Unfortunately, during our new build today, we discovered that the foundation was positioned incorrectly on the plot. The concrete slab has not been poured yet. Because an incorrect boundary marker was assumed, the foundation formwork is located 3 meters (10 feet) too far back on the property. We briefly considered accepting this and submitting a new building permit/planning permission, but ultimately decided against it due to the lack of a garden.
The site manager immediately admitted the mistake. The plan now is to move the foundation forward by 3 meters (10 feet). From what I understand, a section will be added at the front and connected to the rest. At the back, another new section will also be added and connected—the 3 meters (10 feet) of overlapping “remainder” can stay, according to the site manager, as a terrace at the level of the sliding door is planned there anyway. The wastewater pipes and other utilities will, of course, also be relocated.
I am a layperson and honestly relieved that the concrete slab hasn’t been poured yet. However, I am wondering if this is the correct approach. Or should everything actually be removed and redone? I don’t want to cause unnecessary work and am satisfied with a reasonable solution. What is structurally sound and acceptable in such a situation? How is something like this typically handled in practice?
Good luck
S
sergutsch19 Apr 2022 20:31lars909 schrieb:
Wait. Before going into too much detail here.
This is about the strip footings under the formwork blocks. NOT about the slab foundation. That has not been poured yet.as stated in your first post
sergutsch schrieb:
Take a look here 🙂 (sign sign sign)However, I understand it as the pour simply not having been done yet, but the formwork being "complete" in the wrong place and should be poured as is, then extended so that the finished slab reaches the correct position. The house would then be positioned on the intersection of both areas, partly on the incorrect slab and partly on the extension; the unused part of the "wrong" slab would then be used as a terrace. In this case, construction phase I of the slab would be under the heated house and the unheated terrace; conversely, the house would partly rest on slab construction phase I and partly on slab construction phase II. This sounds like trickery typical of @goalkeepers’ favorite neighbors :-(lars909 schrieb:
This concerns the strip footings under the formwork blocks. NOT the slab. That has not been poured yet.Which formwork blocks again – to which part of the building are they supposed to belong?https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
As I understand it, the strip foundation will be extended accordingly, and the concrete slab should be correctly poured as a single unit. The 3 meters (approximately 10 feet) extending into the garden at the back are to remain.
I have no knowledge of structural engineering, but my gut feeling is that the extension is acceptable. However, the section attached at the back cannot be insulated and therefore represents a thermal bridge, at least in my opinion.
He will probably want to keep it as is because demolishing it means opening the foundation, exposing the steel reinforcement. This can lead to corrosion and possibly cause the foundation to crack or break apart after many years.
Consult a professional! From YOUR side. Until then, halt construction.
I have no knowledge of structural engineering, but my gut feeling is that the extension is acceptable. However, the section attached at the back cannot be insulated and therefore represents a thermal bridge, at least in my opinion.
He will probably want to keep it as is because demolishing it means opening the foundation, exposing the steel reinforcement. This can lead to corrosion and possibly cause the foundation to crack or break apart after many years.
Consult a professional! From YOUR side. Until then, halt construction.
A construction stop can only be issued by the authorities – and you can count yourself lucky if you never have to hear that word. But I also understand it the same way as @Joedreck.
I actually knew of a construction project with two staggered semi-detached houses (back then, architectural gimmicks like that were still common). During that, there was a planning error, and they had to pour an additional ground slab for one corner; the other part was too much. However, since thermal bridges were not widely discussed in 1998, it wasn’t considered a problem. The house is still standing.
I would suggest bringing in an expert or appraiser to get their opinion on it. You don’t have one, do you?
I actually knew of a construction project with two staggered semi-detached houses (back then, architectural gimmicks like that were still common). During that, there was a planning error, and they had to pour an additional ground slab for one corner; the other part was too much. However, since thermal bridges were not widely discussed in 1998, it wasn’t considered a problem. The house is still standing.
I would suggest bringing in an expert or appraiser to get their opinion on it. You don’t have one, do you?
Since there still seem to be some misunderstandings: The slab has not been poured yet. The house will also not be built on an oversized slab later. This is “only” about the strip foundations beneath the slab or the formwork blocks.
We do not have any experts involved. The structural engineer is currently calculating the necessary work to correct the strip foundation.
What would the demolition of the foundation approximately cost?
We do not have any experts involved. The structural engineer is currently calculating the necessary work to correct the strip foundation.
What would the demolition of the foundation approximately cost?
S
sergutsch20 Apr 2022 10:35lars909 schrieb:
...
How much would the demolition of the same approximately cost?It really shouldn’t cost you anything since you didn’t order it, and of course you can demand the restoration of the original condition. If you have it buried again, that would be a personal concession on your part—a favor you do for the construction company. That’s how I see it.
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