Land planning on a gentle slope

  • Erstellt am 2024-09-28 18:49:03

Tim1985

2024-09-28 18:49:03
  • #1
Hello dear forum community,

I have been reading along and browsing the forum for quite some time now. For our planned construction project, I ask for your assessment and your advice. It concerns a plot of land on a slight slope and the planning of the building on it. To better illustrate, I am attaching a sketch plan with the measured elevation points as well as the maximum building footprint. We are currently in the floor plan planning stage; the footprint might end up somewhat smaller as a result. The height difference within the max. building area is about 1 m depending on the arrangement, possibly slightly more diagonally. If the building footprint ends up a bit smaller, the max. height difference would also be reduced.

We have already commissioned a soil survey in advance, which recommends either a load-bearing slab with frost skirts or a strip foundation (we had already indicated beforehand that a basement is not necessarily desired). The transition to solid rock occurs at about 2.80 m.

Our plans, based on the soil survey, foresee a building without a basement. The plan is to place the building as lightly as possible into the slope to reduce the height difference somewhat. Now I have read a bit here on the forum and am no longer sure whether this is sensible and works as planned. How do you assess the situation? Is a slab foundation sensible and structurally possible? Are (southeast-side) L-elements necessary, or can the slope possibly be cut back due to the size of the plot? How high do you estimate the overall costs for the earthworks?

Note: The terrace is expected to run around the southeast corner of the building.

Thanks in advance for your advice!

[ATTACH alt="Lageskizze_Höhepunkte.JPG"]87934[/ATTACH]
 

ypg

2024-09-28 22:07:47
  • #2

Yes, why not?

What do you want to build?

Then just show it.
 

11ant

2024-09-29 00:14:27
  • #3

Two point eighty from where? – I don’t see any borehole points marked, and to which one(s) would that apply?
Slope in the terrain also means slope for surface water, which limits the options for omission. If you have not only read but also understood the 11-ant basement rule, then you know: it’s not only the basement that costs, but also the terrain modelings not used for a basement.
How one can approach a floor plan without having processed the deductions from the topographical findings is beyond me. You can almost plan the same cloud-cuckoo lands as if you didn’t know the property yet.
There are several people here who understand soil reports and can work with them. You should show that, more urgently than your own floor plan etudes.
 

Tim1985

2024-09-29 13:35:52
  • #4

I have become uncertain about the construction with a slab foundation due to the above-mentioned height difference caused by the slight slope. We are still at the beginning of the floor plan design. It will take a while before I can show something. First, we must clearly determine whether a basement is necessary or sensible.


Two boreholes were made for the soil investigation - one each in the SW corner and in the NE corner of the marked building footprint. 2.80 m from the ground surface. More details enclosed in the key statements of the geotechnical report. It is clear that additional costs arise from the excavation work and terrain modifications.



The starting point here was the geotechnical report, which, as described, recommends either a load-bearing slab foundation with frost skirts or a strip foundation. We are still relatively early in the floor plan design, and while researching here in the forum, I came across the topic of basement / slab foundation / earthworks again. It is completely clear to me that a basement naturally has an impact on the floor plan.

For further assessment, enclosed are the key statements of the geotechnical report with the request for your evaluation.

 

11ant

2024-09-29 21:17:10
  • #5

That's how it is, and therefore I also have no idea where ...

... this assumed specific footprint along with its location comes from, for which, by the way, two boring points are very sparse.

Two point eighty below 452.56 would be 449.76, that would be only 1.09 m below 450.85. Apples and oranges.
 

hanghaus2023

2024-10-01 13:47:52
  • #6
Here so that can better imagine it. In the house, 1.5 m difference. Of course with a basement or better a lower ground floor if the budget does not allow it.

Is there no development plan?

 

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