Bauexperte
2015-02-18 15:35:32
- #1
Hello,
You sent me the soil report for the municipality. Thank you very much!
Really very rough, because – even if one of the boreholes was conducted near your property – there are some differences in the 6 boreholes. For example, in the borehole posted here no moisture was encountered, whereas in 4 others moisture was found, though at different depths and only declared as weak moisture.
In the report for the planned roads, mainly silts are encountered; these belong to the category of cohesive soils and thus to soil class 4. Provided your building partner covers this soil class with his performance description, you will not have much concern regarding additional costs for earthworks. Unless your property is situated lower or higher and thus requires necessary earthworks. Based on the pictures, it looks as if some plots might be slightly sloping; even then additional foundation costs arise.
Cohesive Soil
Cohesive soil differs from loose soil by its plate-like structure. Due to the nature of the plates, cohesive soil can absorb and retain water. The surface of the plates softens, reducing the friction between the plates. This changes the consistency and the load-bearing capacity of the soil deteriorates. As the water content decreases, the soil’s load-bearing capacity improves again. Cohesive soils are silts and clays as well as mixtures of silts and clays. They may also contain a non-cohesive portion of up to 15%. The individual grains of cohesive soils can no longer be seen with the naked eye. For cohesive soils, the load-bearing capacity of the soil can deteriorate and, in extreme cases, lead to foundation settlement, although usually other causes are involved.
At first glance, I would therefore suspect that you do not have to expect "major problems" regarding foundations (unless the property is situated higher or lower, slightly sloping). BUT – it always depends on 2.00 m where soil conditions can be quite different. Therefore, I can only advise you to have a soil report prepared specifically for your preferred property. It’s not as if you want to build a basement and precisely on your property the mentioned weak moisture is higher. There must be some reason that 2 boreholes show no moisture measurement, while 4 do.
Rhine regards
You sent me the soil report for the municipality. Thank you very much!
My question would be whether one of the experts present here could give a very "rough" estimate of the necessary earthworks?
Really very rough, because – even if one of the boreholes was conducted near your property – there are some differences in the 6 boreholes. For example, in the borehole posted here no moisture was encountered, whereas in 4 others moisture was found, though at different depths and only declared as weak moisture.
In the report for the planned roads, mainly silts are encountered; these belong to the category of cohesive soils and thus to soil class 4. Provided your building partner covers this soil class with his performance description, you will not have much concern regarding additional costs for earthworks. Unless your property is situated lower or higher and thus requires necessary earthworks. Based on the pictures, it looks as if some plots might be slightly sloping; even then additional foundation costs arise.
Cohesive Soil
Cohesive soil differs from loose soil by its plate-like structure. Due to the nature of the plates, cohesive soil can absorb and retain water. The surface of the plates softens, reducing the friction between the plates. This changes the consistency and the load-bearing capacity of the soil deteriorates. As the water content decreases, the soil’s load-bearing capacity improves again. Cohesive soils are silts and clays as well as mixtures of silts and clays. They may also contain a non-cohesive portion of up to 15%. The individual grains of cohesive soils can no longer be seen with the naked eye. For cohesive soils, the load-bearing capacity of the soil can deteriorate and, in extreme cases, lead to foundation settlement, although usually other causes are involved.
At first glance, I would therefore suspect that you do not have to expect "major problems" regarding foundations (unless the property is situated higher or lower, slightly sloping). BUT – it always depends on 2.00 m where soil conditions can be quite different. Therefore, I can only advise you to have a soil report prepared specifically for your preferred property. It’s not as if you want to build a basement and precisely on your property the mentioned weak moisture is higher. There must be some reason that 2 boreholes show no moisture measurement, while 4 do.
Rhine regards