ᐅ Plot with a change in ground level – boundary wall between neighbors – foundation?
Created on: 10 Jul 2017 19:20
D
DReffects
Hello!
I hope this is roughly the correct section for my question; if not, please feel free to move it.
Situation:
The neighbor’s plot is significantly higher than mine, and their garage was built just 20cm (8 inches) from the property line. Since the development plan actually requires that there be no sudden changes in ground level, the neighbor should have compensated for the height difference with a slope at about 45°. My garden level means there would be a roughly 1.5m (5 feet) wide slope here—of course, at the expense of their plot. So, we agreed that instead of the slope (and demolishing part of the garage...), the neighbor must build a retaining wall on the property line, which also ensures that drainage happens where it’s supposed to.
We have not yet set the final ground level on our side; we plan to lower it by about 70cm (28 inches). Now, the neighbor has dug a trench along the property line, poured concrete into it, and is building a wall on this foundation using hollow blocks that they also plan to fill with concrete later.
If I remove about 70cm (28 inches) of soil on my side, this will expose all but 30cm (12 inches) of their foundation. From my point of view, 30cm (12 inches) is not enough to support a roughly 1.8m (6 feet) high wall along with the adjacent garage and garden.
The neighbor disagrees. Therefore, my question: is there an online calculator somewhere that can determine the required foundation depth? I would rather not have the neighbor’s wall collapse on my children in a year... My construction company has also expressed concerns and does not want to carry out any further earthworks until the wall issue is resolved.
Thank you
I hope this is roughly the correct section for my question; if not, please feel free to move it.
Situation:
The neighbor’s plot is significantly higher than mine, and their garage was built just 20cm (8 inches) from the property line. Since the development plan actually requires that there be no sudden changes in ground level, the neighbor should have compensated for the height difference with a slope at about 45°. My garden level means there would be a roughly 1.5m (5 feet) wide slope here—of course, at the expense of their plot. So, we agreed that instead of the slope (and demolishing part of the garage...), the neighbor must build a retaining wall on the property line, which also ensures that drainage happens where it’s supposed to.
We have not yet set the final ground level on our side; we plan to lower it by about 70cm (28 inches). Now, the neighbor has dug a trench along the property line, poured concrete into it, and is building a wall on this foundation using hollow blocks that they also plan to fill with concrete later.
If I remove about 70cm (28 inches) of soil on my side, this will expose all but 30cm (12 inches) of their foundation. From my point of view, 30cm (12 inches) is not enough to support a roughly 1.8m (6 feet) high wall along with the adjacent garage and garden.
The neighbor disagrees. Therefore, my question: is there an online calculator somewhere that can determine the required foundation depth? I would rather not have the neighbor’s wall collapse on my children in a year... My construction company has also expressed concerns and does not want to carry out any further earthworks until the wall issue is resolved.
Thank you
DReffects schrieb:
In the last picture, you can see that there is about an 8cm (3 inch) gap between the wall and the garage; behind it is a water pipe. So the wall will not contribute to the garage’s stability later on. Regarding the garage, I still don’t see anything that convinces me of good long-term stability. Otherwise, the wall is exactly as I had imagined from your descriptions: the neighbor basically made "L-shaped blocks according to their own recipe." From a construction perspective, this is not naive or foolish, even if it’s unconventional from an official planning permission point of view. It can definitely be done that way. Not “standard,” but it still looks precise. With some Rhineland calmness, one might even approve it.
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11ant schrieb:
Regarding the garage, I still don’t see anything that convinces me of lasting stability. Otherwise, the wall is pretty much what I had already imagined based on your description: the neighbor basically used “L-shaped blocks made to his own recipe.” From a construction perspective, that’s not a foolish or naive approach, although it’s unconventional from an official planning permission standpoint. It can definitely work that way. Not “standard,” but it still looks precise. With some Rhineland calmness, you could almost put a stamp on it.Uh, don’t get me wrong – but those L-shaped blocks are on his side. How are they supposed to resist the earth pressure on my side? Or am I misunderstanding something?
What about frost protection and drainage? I have since watched several foundation tutorials online; they always mention at least a 30cm (12 inches) gravel layer plus drainage for a foundation at least 80cm (31 inches) deep, like this one:
Thanks for the information! At least that’s somewhat reassuring. He started those extensions in his garden on Thursday after our site manager expressed serious concerns again. I still don’t quite understand why this would benefit his property – could you please explain it to me?
We were told that a neat solution using L-shaped angle brackets is possible, with the L-part positioned below our lawn due to the approximately 45° slope causing soil pressure, so that it can provide proper support.
How should this be assessed in terms of frost protection and drainage?
We were told that a neat solution using L-shaped angle brackets is possible, with the L-part positioned below our lawn due to the approximately 45° slope causing soil pressure, so that it can provide proper support.
How should this be assessed in terms of frost protection and drainage?
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