House with slab foundation on a slope

Hello fsbau

if you have a height measuring point on the street and two on the property, then you can determine the differences exactly.
Otherwise, buy a cheap hose level and measure yourself.

Steven

What makes me suspicious is the slope; I have been on site several times and after 1.5m it does not look like that on the construction site.

Now that you yourself have doubts, I took a closer look at the development plan and the contour lines and reread your slope data, and I have to admit that I was misled by your non-to-scale sketch with dramatically appearing underpinning. If you rotate the house by 90°, meaning the slope runs along the narrow side (9.44m), the height difference at the residential building—assuming a uniform slope—is only 1.5m / 18m * 9.44m = 0.79m. If the road runs differently than the existing terrain, then we are back in areas where one can actually speak of a slight slope, and the foundation slab can lead to a sensible and cost-effective solution. ’s request from #20

Height information in measuring points would be helpful; only having contour lines is better than nothing but gives a less clear picture.

should therefore be an absolute basis for further discussion.

Unfortunately, I cannot provide that. I only have the two measured bore points from the soil survey in relation to the street. I will try to take some pictures. The street definitely has a slope; the building plot (property) has probably already been leveled. When I calculate with the street's slope of 8.3% and the width of the base plate of 10.90m, I come to 90 cm. I can imagine leveling, meaning excavating 0.45m on the left and filling 0.45m on the right. Thus, dividing the property with a width of 18m into three parts and building it in a stepped manner: the first part on the left is the garage, the second part the house with each 45 cm excavated/filled, and in the third part on the right the parking space on the third height. The sketch with the 1.5m refers to the slope of the street and the bore points measured on it.

Our architect said maybe 1-2 m over 20 m length is not noticeable to an untrained eye, especially if there are no references.

Get yourself a laser pointer and a measuring tape and a spirit level.

What makes me suspicious is the slope; I have been on site several times and after 1.5m it doesn’t look like that on the construction site.

Nothing from the quite wild radio traffic between your vestibular organ and your leg to neck muscles, etc., is printed out for your consciousness. As a result, you simply stand upright and are unaware of the effort involved. The underestimation of the perspective distortion of the visually still perceived slope does the rest, causing your body as a "corrupt measuring instrument" to doubt the results of the learned land surveyor.

attached are 3 pictures, one of the north side, one of the south side, and one of the east side.