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neutronbx4 Jul 2019 21:00Hello everyone,
We had a site soil investigation carried out for our new single-family home. The original plan was to build on a slab foundation without a basement.
This has now changed, and we are planning to include a basement. Unfortunately, the boreholes were only drilled to a depth of 3m (10 feet) due to the previous plan for a slab foundation.
Now I have two questions:
1. Can I still use this report for the basement planning, or do I have to bite the bullet and commission a new (more expensive) investigation?
2. Is the soil suitable for a basement, or is it better to avoid it due to potentially high additional costs? I can't really interpret all the measured parameters.
We had a site soil investigation carried out for our new single-family home. The original plan was to build on a slab foundation without a basement.
This has now changed, and we are planning to include a basement. Unfortunately, the boreholes were only drilled to a depth of 3m (10 feet) due to the previous plan for a slab foundation.
Now I have two questions:
1. Can I still use this report for the basement planning, or do I have to bite the bullet and commission a new (more expensive) investigation?
2. Is the soil suitable for a basement, or is it better to avoid it due to potentially high additional costs? I can't really interpret all the measured parameters.
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neutronbx6 Jul 2019 15:21Anyone have an idea or advice?
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neutronbx7 Jul 2019 15:34rick2018 schrieb:
You will have to dig deeper than 3 meters (10 feet) for the basement.
Either get a new survey, which won’t give you 100% certainty, or just take the risk.
In my experience, I would do it without an additional survey. Thank you for your input. Do you mean I need to dig deeper than 3 meters (10 feet) during excavation or when drilling for the soil survey? Why would you choose to proceed without an additional survey in my situation? As I mentioned, I’m not familiar with all the geological data at all.
I think you need to dig at least 4 meters (13 feet).
That accounts for one floor height plus ceiling, floor, foundation slab, and substructure.
If you plan to drill again, consider 5 to 6 meters (16 to 20 feet) to be on the safe side.
Why I would take that risk: what are the chances that it will differ compared to 3 meters (10 feet)?
How many drillings do you have? We drilled in three locations, did five test pits, and even had one hole from the old house.
In the end, there was a clay lens running across the building area. We found that with no investigation beforehand. This is why I said that an additional drilling does not guarantee 100% safety.
Your soil is classified as Z0 Max. Z1.1, so it is easy to dispose of. You might even be able to use it for landscaping on your property.
Soil classes 4-5 can also be removed easily with smaller machines.
If you are willing to cover the costs of a basement, your soil is not a problem.
That accounts for one floor height plus ceiling, floor, foundation slab, and substructure.
If you plan to drill again, consider 5 to 6 meters (16 to 20 feet) to be on the safe side.
Why I would take that risk: what are the chances that it will differ compared to 3 meters (10 feet)?
How many drillings do you have? We drilled in three locations, did five test pits, and even had one hole from the old house.
In the end, there was a clay lens running across the building area. We found that with no investigation beforehand. This is why I said that an additional drilling does not guarantee 100% safety.
Your soil is classified as Z0 Max. Z1.1, so it is easy to dispose of. You might even be able to use it for landscaping on your property.
Soil classes 4-5 can also be removed easily with smaller machines.
If you are willing to cover the costs of a basement, your soil is not a problem.
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