ᐅ Building Site: Extensive Fill or Is It Better to Have a Basement with Excavation?
Created on: 31 Mar 2019 19:14
T
Thierse
We own a sloped plot (about 3 m (10 ft) height difference between the street and the future garden level at the basement) and originally planned to build with a residential basement because the land slopes downward from the street.
However, today we visited the site with an experienced civil engineer who specializes in foundations for prefabricated houses. He believes it would be more practical and cost-effective to build without a basement and instead raise the ground level by up to 3 m (10 ft) using recycled gravel. Even if that requires around 500 m³ of gravel.
This could be well compacted with a roller, and settlement would not be an issue. The parking spaces and the house facade would need to be filled in anyway to reach the entrance.
Otherwise, due to the relatively high position of the sewer connection, we would need a pump system in the basement, and disposing of the excavated material (clay soil, about 200 m³) would be very expensive in the region because there are almost no landfills available (35 €/m²).
Who has experience with these issues? I thought a basement was usually more cost-effective and safer on sloped plots than large-scale fill?
However, today we visited the site with an experienced civil engineer who specializes in foundations for prefabricated houses. He believes it would be more practical and cost-effective to build without a basement and instead raise the ground level by up to 3 m (10 ft) using recycled gravel. Even if that requires around 500 m³ of gravel.
This could be well compacted with a roller, and settlement would not be an issue. The parking spaces and the house facade would need to be filled in anyway to reach the entrance.
Otherwise, due to the relatively high position of the sewer connection, we would need a pump system in the basement, and disposing of the excavated material (clay soil, about 200 m³) would be very expensive in the region because there are almost no landfills available (35 €/m²).
Who has experience with these issues? I thought a basement was usually more cost-effective and safer on sloped plots than large-scale fill?
Build with the terrain.
I don’t understand why someone would want to alter a plot of land so drastically. Everything should be contained at the edges.
A little grading for a level terrace or driveway is fine, but a basement can be used effectively. Okay... a lift station... but it will probably work for the kitchen.
I always prefer a direct route from the living or family room to the garden...
However, the orientation, terrain, and plot are not known here at all.
I don’t understand why someone would want to alter a plot of land so drastically. Everything should be contained at the edges.
A little grading for a level terrace or driveway is fine, but a basement can be used effectively. Okay... a lift station... but it will probably work for the kitchen.
I always prefer a direct route from the living or family room to the garden...
However, the orientation, terrain, and plot are not known here at all.
G
Grantlhaua1 Apr 2019 11:14Thierse schrieb:
I do have concerns about stability and settlement when filling with gravel up to 3m (10 feet) in height. Is it really possible to manage that well?I would hardly include the transport costs. After all, the gravel still needs to be transported to your construction site. Regarding the soil, you might want to ask farmers you know, as they sometimes need soil themselves.
M
Mottenhausen1 Apr 2019 12:29Something seems to be mixed up here.
1. Lifting station: If there is no wastewater generated in the basement, you don’t need a lifting station. In that case, the pipes are simply routed sideways just below the basement ceiling (above the backflow level) to the outside. So it’s basically the same situation with or without a basement. Guests can also easily use the stairs to reach the guest bathroom. Condensate drainage of the
2. 200m³ (260 cubic yards) of excavation: That’s only part of the story. Even when building without a basement, the mineral aggregate base is not just dumped in the soil. Especially on a slope, the clay will need to be excavated to create a reasonably level surface for the mineral aggregate; otherwise, the house and the mineral aggregate base would slide down the slope. Long story short: In the end, you will still have 100m³ (130 cubic yards) or more of excavation, even without a basement.
3. Backfilling excavation on the property? Slopes are naturally suitable for raising the lower part or shaping the garden into terraces.
1. Lifting station: If there is no wastewater generated in the basement, you don’t need a lifting station. In that case, the pipes are simply routed sideways just below the basement ceiling (above the backflow level) to the outside. So it’s basically the same situation with or without a basement. Guests can also easily use the stairs to reach the guest bathroom. Condensate drainage of the
2. 200m³ (260 cubic yards) of excavation: That’s only part of the story. Even when building without a basement, the mineral aggregate base is not just dumped in the soil. Especially on a slope, the clay will need to be excavated to create a reasonably level surface for the mineral aggregate; otherwise, the house and the mineral aggregate base would slide down the slope. Long story short: In the end, you will still have 100m³ (130 cubic yards) or more of excavation, even without a basement.
3. Backfilling excavation on the property? Slopes are naturally suitable for raising the lower part or shaping the garden into terraces.
Steven schrieb:
Hello Thierse,
you might as well ask how much a car costs.
A standard bathroom, including a sink and shower, fully tiled, can become quite expensive if you hire a premium company. If you’re willing to do some work yourself and hire a versatile tile installer, you can stay under 1,000 euros plus materials.
Steven If I’m not mistaken, the question was about the cost of a sewage-compatible lifting station, not the bathroom. Its costs don’t change depending on the location.
What is the average cost of a sewage-capable lifting station when installing a bathroom in the basement? Are we talking about 1,000 € or 10,000 €?
A bathroom is to be installed in the basement because it will become a living space (the garden side is completely exposed due to the slope).
The excavation soil is quite clayey and not suitable for backfilling.
A bathroom is to be installed in the basement because it will become a living space (the garden side is completely exposed due to the slope).
The excavation soil is quite clayey and not suitable for backfilling.
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