ᐅ Costs for Earthworks/Basement Construction (Rhein-Sieg District), North Rhine-Westphalia
Created on: 9 Mar 2012 10:39
P
Projekt 2012P
Projekt 20129 Mar 2012 10:39Hello everyone,
We are still undecided about whether we want or can build with a basement. The reason is quite varied cost estimates from different consultants and advisors in our private circle, especially regarding the earthworks costs, since from about 2 m (6.5 ft) depth the soil class 7 (compact rock/sandstone of the Devonian) is encountered here.
Perhaps you have opinions or experience regarding the cost of earthworks (excavation and disposal to a landfill)? Here are the details from the soil report:
Construction location: Rhein-Sieg district (60 km (37 miles) east of Cologne)
Ground floor area: 10 m x 11 m (33 ft x 36 ft)
Up to 0.3 m (1 ft) depth: soil class 1/topsoil
0.3 m to 1.2 m (1 ft to 4 ft) depth: sandy silts (soil classes 2-4)
1.2 m to 1.8 m (4 ft to 6 ft) depth: soil class 5 clay and rock fragments
1.8 m to 2.0 m (6 ft to 6.5 ft) depth: soil class 6 weathered rock
From 2.0 m (6.5 ft) depth: transition from soil class 6 to soil class 7 compact rock
The foundation base is planned at -3.20 m (-10.5 ft), so in weathered rock/solid rock.
Best regards and thanks
Projekt 2012
We are still undecided about whether we want or can build with a basement. The reason is quite varied cost estimates from different consultants and advisors in our private circle, especially regarding the earthworks costs, since from about 2 m (6.5 ft) depth the soil class 7 (compact rock/sandstone of the Devonian) is encountered here.
Perhaps you have opinions or experience regarding the cost of earthworks (excavation and disposal to a landfill)? Here are the details from the soil report:
Construction location: Rhein-Sieg district (60 km (37 miles) east of Cologne)
Ground floor area: 10 m x 11 m (33 ft x 36 ft)
Up to 0.3 m (1 ft) depth: soil class 1/topsoil
0.3 m to 1.2 m (1 ft to 4 ft) depth: sandy silts (soil classes 2-4)
1.2 m to 1.8 m (4 ft to 6 ft) depth: soil class 5 clay and rock fragments
1.8 m to 2.0 m (6 ft to 6.5 ft) depth: soil class 6 weathered rock
From 2.0 m (6.5 ft) depth: transition from soil class 6 to soil class 7 compact rock
The foundation base is planned at -3.20 m (-10.5 ft), so in weathered rock/solid rock.
Best regards and thanks
Projekt 2012
B
Bauexperte9 Mar 2012 11:13Hello,
We are currently building in Hennef as well as Troisdorf; excavation, transport, and disposal costs last October for "normal" soil conditions were around €12.50 per cubic meter.
If you plan to build with a basement, I strongly recommend getting a detailed quote for the earthworks. If you don’t have a civil contractor at hand, I can gladly recommend one from Rösrath.
Giving a general figure is difficult to impossible because heavy machinery will likely be needed in deeper layers. However, in my opinion, you should budget about half of the basement cost extra for the necessary earthworks; not every civil contractor owns heavy equipment, as these machines are quite expensive.
Kind regards
Projekt 2012 schrieb:
Maybe you have some opinions/experiences regarding the costs of earthworks (excavation and disposal at a landfill)? ... The foundation slab is supposed to be at -3.20 m (10.5 feet), so in weathered rock/bedrock
We are currently building in Hennef as well as Troisdorf; excavation, transport, and disposal costs last October for "normal" soil conditions were around €12.50 per cubic meter.
If you plan to build with a basement, I strongly recommend getting a detailed quote for the earthworks. If you don’t have a civil contractor at hand, I can gladly recommend one from Rösrath.
Giving a general figure is difficult to impossible because heavy machinery will likely be needed in deeper layers. However, in my opinion, you should budget about half of the basement cost extra for the necessary earthworks; not every civil contractor owns heavy equipment, as these machines are quite expensive.
Kind regards
B
Bauexperte9 Mar 2012 14:48Hello,
Contact me via email (through my profile here) and then I will give you his address; of course, I would like to know who I am dealing with.
A true waterproof concrete shell (“white tank”) is unlikely; that would be a “basement within basement” system, although nowadays few still know that. You probably mean an additional waterproofing layer. For a 10 x 11 meter (33 x 36 feet) footprint, around 50 to 55 thousand euros including protection against seepage water or rising damp would be realistic.
No, that would be new to me if it were fee-based. He will visit the site, want to see the soil report or excerpts from it, and then provide you with a quotation.
The usual “suspects”: soil classes 3 to 5.
Kind regards
Projekt 2012 schrieb:
I’m always grateful for tips or recommendations, so I appreciate the mention of the Rösrather contractor....
Contact me via email (through my profile here) and then I will give you his address; of course, I would like to know who I am dealing with.
Projekt 2012 schrieb:
According to the soil report, the basement is supposed to be built with a waterproof concrete shell ("white tank")....I’m estimating around 50 to 60 thousand euros, right?
A true waterproof concrete shell (“white tank”) is unlikely; that would be a “basement within basement” system, although nowadays few still know that. You probably mean an additional waterproofing layer. For a 10 x 11 meter (33 x 36 feet) footprint, around 50 to 55 thousand euros including protection against seepage water or rising damp would be realistic.
Projekt 2012 schrieb:
Two small questions:
1) Is an estimate or offer from the Rösrather contractor subject to a fee, and if so, how much?
No, that would be new to me if it were fee-based. He will visit the site, want to see the soil report or excerpts from it, and then provide you with a quotation.
Projekt 2012 schrieb:
What soil classes are hidden behind the "normal soil conditions" you mentioned?
The usual “suspects”: soil classes 3 to 5.
Kind regards
P
Projekt 20129 Mar 2012 15:23What specific information do you need about me?
"Hardly a true tanked basement, that would be a 'basement within a basement' system, although nowadays very few people still know that; you probably mean an additional waterproofing layer."
As a layperson, could you please briefly explain the (true tanked basement) to me again? The report states: "In the case of a basement, groundwater ingress must be expected, and construction against external water pressure and rising seepage water with appropriate buoyancy protection is required. This can be achieved either by a 'tanked basement' or waterproofing according to DIN 18195 T6...."
What costs are associated with the described method compared to a "true tanked basement"?
Best regards
"Hardly a true tanked basement, that would be a 'basement within a basement' system, although nowadays very few people still know that; you probably mean an additional waterproofing layer."
As a layperson, could you please briefly explain the (true tanked basement) to me again? The report states: "In the case of a basement, groundwater ingress must be expected, and construction against external water pressure and rising seepage water with appropriate buoyancy protection is required. This can be achieved either by a 'tanked basement' or waterproofing according to DIN 18195 T6...."
What costs are associated with the described method compared to a "true tanked basement"?
Best regards
B
Bauexperte11 Mar 2012 18:36Hello,
Your real name and where you live, so I can inform my deep foundation specialist who will be contacting you
The term "white tank" originally comes from railway construction terminology. A true white tank—in its original sense—meant a "basement within a basement." A masonry wall was built, and behind it, another masonry wall was constructed...
Today, the term "white tank" refers to a waterproof basement (concrete basement made of waterproof concrete) which also receives—like in your case—an additional waterproofing layer (here against groundwater layers). You would need a waterproof concrete basement (this is usually cost-neutral compared to a masonry basement). For a 10.00 x 11.00 m (33 x 36 ft) size, the additional cost for the waterproofing/sealing against water pressure would be approximately 5,000 to 6,000 euros.
Kind regards
Projekt 2012 schrieb:
What exact information do you need about me??
Your real name and where you live, so I can inform my deep foundation specialist who will be contacting you
Projekt 2012 schrieb:
As a layperson, could you please briefly explain the term "real white tank" again?
The term "white tank" originally comes from railway construction terminology. A true white tank—in its original sense—meant a "basement within a basement." A masonry wall was built, and behind it, another masonry wall was constructed...
Projekt 2012 schrieb:
The report states: "For a basement construction, groundwater layers must be expected, and waterproofing against external water pressure and rising seepage water with appropriate buoyancy protection is required. This can be executed as a ‘white tank’ or waterproofing according to DIN 18195 Part 6...."
What costs are associated with the described method compared to the "real white tank"?
Today, the term "white tank" refers to a waterproof basement (concrete basement made of waterproof concrete) which also receives—like in your case—an additional waterproofing layer (here against groundwater layers). You would need a waterproof concrete basement (this is usually cost-neutral compared to a masonry basement). For a 10.00 x 11.00 m (33 x 36 ft) size, the additional cost for the waterproofing/sealing against water pressure would be approximately 5,000 to 6,000 euros.
Kind regards
P
Projekt 201216 Mar 2012 13:15Sorry for the somewhat delayed response!
The basement is off the table for now, as two prefabricated construction companies have quoted us costs of about 50,000 to 60,000 euros for the waterproof structure with interior finishing, plus approximately 20,000 euros more for the excavation work, including soil classification 6/7. The total of 80,000 to 85,000 euros is just a bit too much for us...
Best regards
Projekt 2012
The basement is off the table for now, as two prefabricated construction companies have quoted us costs of about 50,000 to 60,000 euros for the waterproof structure with interior finishing, plus approximately 20,000 euros more for the excavation work, including soil classification 6/7. The total of 80,000 to 85,000 euros is just a bit too much for us...
Best regards
Projekt 2012
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