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henning8917 Jul 2016 11:45Hello,
I am planning to build a single-family house with a basement in Hamburg.
Since I am purchasing the land from the city, there are some special requirements. For example, the house design must be approved by a specific advisory board (IBA Hamburg). Unfortunately, this is the only way to obtain an affordable building plot.
As a result, I have to commit to a house design from a construction company before a soil survey can be carried out. Additionally, I would like to build with a basement because, due to the regulations, more floor area on the ground floor and upper floor is not possible. The basement is intended for hobby use as well as storage and a utility room (with the utility room in the basement, I gain the additional room needed on the ground floor).
The following is currently known about the soil:
"The soil in Fischbeker Heidbrook consists of sands and mixed-grain soils such as glacial till and silts. In areas with low hydraulic permeability of the soils, weather-related occurrences of perched water layers can be expected. The groundwater level is between approximately 4 and 13 meters (13 and 43 feet) deep."
Furthermore, connecting a drainage system to the sewer is not permitted. Therefore, I have asked the construction company to initially plan the basement as a waterproof concrete shell ("white tank").
My question is whether the specifications in the offer correspond to a white tank, as the term is not explicitly mentioned.
"Reinforced concrete basement floor C 25/30 XC 4, clean layer of a Delta MS dimple mat, reinforcement 2x Q524, thickness 25 cm (10 inches)"
"Basement exterior walls made of hollow-core wall elements with cast-in-place concrete C 25/30 XC 4, thickness 30 cm (12 inches), including a joint sheet at the wall/floor transition, reinforcement of the walls 2x Q257"
"Horizontal waterproofing on the basement floor under the interior walls with Delta-Softflex, extending 10 cm (4 inches) inward"
"Basement exterior waterproofing:
Forming a sealing fillet in the wall foot area with a mineral mortar and a silicification sequence according to the manufacturer's guidelines.
All edges milled, substrate cleaned of light contamination.
Application of a filling and scratch coat as a pore sealer on the primed surfaces, in accordance with DIN 18195, edition 2000-08, using a two-component, polymer-modified bitumen thick coating. Waterproofing of the surfaces against rising seepage water, in accordance with DIN 18195 Part 6, Section 9, edition 2000-08, with KMB and full-surface fabric reinforcement. Dry layer thickness 4 mm (0.16 inches). Thickness control and documentation according to DIN 18195 Part 3, paragraph 5.4.4."
"Waterproofing of the basement base areas of the exterior masonry horizontally and vertically with a polymer-modified bitumen thick coating and fabric reinforcement in the wall foot area."
The basement insulation (KFW40 standard) is done with 160 mm (6.3 inches) WLZ038 under the floor slab and 180 mm (7 inches) WLZ031 on the walls.
I am planning to build a single-family house with a basement in Hamburg.
Since I am purchasing the land from the city, there are some special requirements. For example, the house design must be approved by a specific advisory board (IBA Hamburg). Unfortunately, this is the only way to obtain an affordable building plot.
As a result, I have to commit to a house design from a construction company before a soil survey can be carried out. Additionally, I would like to build with a basement because, due to the regulations, more floor area on the ground floor and upper floor is not possible. The basement is intended for hobby use as well as storage and a utility room (with the utility room in the basement, I gain the additional room needed on the ground floor).
The following is currently known about the soil:
"The soil in Fischbeker Heidbrook consists of sands and mixed-grain soils such as glacial till and silts. In areas with low hydraulic permeability of the soils, weather-related occurrences of perched water layers can be expected. The groundwater level is between approximately 4 and 13 meters (13 and 43 feet) deep."
Furthermore, connecting a drainage system to the sewer is not permitted. Therefore, I have asked the construction company to initially plan the basement as a waterproof concrete shell ("white tank").
My question is whether the specifications in the offer correspond to a white tank, as the term is not explicitly mentioned.
"Reinforced concrete basement floor C 25/30 XC 4, clean layer of a Delta MS dimple mat, reinforcement 2x Q524, thickness 25 cm (10 inches)"
"Basement exterior walls made of hollow-core wall elements with cast-in-place concrete C 25/30 XC 4, thickness 30 cm (12 inches), including a joint sheet at the wall/floor transition, reinforcement of the walls 2x Q257"
"Horizontal waterproofing on the basement floor under the interior walls with Delta-Softflex, extending 10 cm (4 inches) inward"
"Basement exterior waterproofing:
Forming a sealing fillet in the wall foot area with a mineral mortar and a silicification sequence according to the manufacturer's guidelines.
All edges milled, substrate cleaned of light contamination.
Application of a filling and scratch coat as a pore sealer on the primed surfaces, in accordance with DIN 18195, edition 2000-08, using a two-component, polymer-modified bitumen thick coating. Waterproofing of the surfaces against rising seepage water, in accordance with DIN 18195 Part 6, Section 9, edition 2000-08, with KMB and full-surface fabric reinforcement. Dry layer thickness 4 mm (0.16 inches). Thickness control and documentation according to DIN 18195 Part 3, paragraph 5.4.4."
"Waterproofing of the basement base areas of the exterior masonry horizontally and vertically with a polymer-modified bitumen thick coating and fabric reinforcement in the wall foot area."
The basement insulation (KFW40 standard) is done with 160 mm (6.3 inches) WLZ038 under the floor slab and 180 mm (7 inches) WLZ031 on the walls.
H
henning8917 Jul 2016 13:37I would like to have a soil survey done, but the building area is still being developed, and the seller (City of Hamburg) is not allowing me onto the property yet. The plots have not even been marked out, so the soil surveyor would first have to carry out their own measurements.
The situation is certainly not ideal, but I have no influence over these conditions, and there are no other reasonably affordable plots in sight. I have reserved the plot so far and am only allowed to purchase it after obtaining an approved building permit / planning permission. This process involves certain deadlines, which means planning has to start before the soil survey.
The survey will definitely be done before construction begins. However, I want to estimate the construction costs beforehand, so I have asked the builder to include a waterproof concrete shell (commonly known as a “white tank”) as a precaution in the calculation. My question is whether the offer corresponds to a waterproof concrete shell. For example, is concrete classified as XC4 the same as waterproof concrete (WU concrete)?
The situation is certainly not ideal, but I have no influence over these conditions, and there are no other reasonably affordable plots in sight. I have reserved the plot so far and am only allowed to purchase it after obtaining an approved building permit / planning permission. This process involves certain deadlines, which means planning has to start before the soil survey.
The survey will definitely be done before construction begins. However, I want to estimate the construction costs beforehand, so I have asked the builder to include a waterproof concrete shell (commonly known as a “white tank”) as a precaution in the calculation. My question is whether the offer corresponds to a waterproof concrete shell. For example, is concrete classified as XC4 the same as waterproof concrete (WU concrete)?
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Bauexperte17 Jul 2016 15:12henning89 schrieb:
The following is known about the building ground so far:
"The soil in the Fischbeker Heidbrook area consists mainly of sands and mixed-grain soils such as glacial till and silts. In areas where the soils have low hydraulic conductivity, seasonal seepage water is expected. The groundwater level ranges approximately between 4 and 13 meters (13 and 43 feet) in depth."
"Basement exterior waterproofing:
... according to DIN 18195 ... according to DIN 18195 Part 6 The planned construction is based on the soil conditions known so far.
Regards, Bauexperte
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