Hotdogxxxx
2021-05-05 10:55:05
- #1
Hello knowledgeable ones,
we are planning the construction of a new house and want to build it with a basement. According to the soil report, the soil consists of impermeable glacial till clay up to a depth of about 5 m. Below that, there is permeable sand. There is no problem with rising groundwater here. However, surface water can be conducted to the basement wall due to the soil. The expert says that the basement could be constructed either with masonry with wall drainage panels or with watertight concrete. For masonry, ring drainage should be used and possibly a soakaway pit installed. When using watertight concrete, according to the report, no drainage is necessary.
The construction company now recommends a masonry basement with waterproofing against pressurized water and perimeter insulation boards. In addition, a ring drainage and a soakaway pit. Alternatively, one could also work with watertight concrete and open water management. In principle, they would still recommend ring drainage with a soakaway pit for the watertight concrete to avoid long-term problems.
The execution of the basement is made more expensive by these measures/recommendations by about €17k for the masonry basement, and with watertight concrete (with open water management) by €7k or watertight concrete (with ring drainage and soakaway pit) by €16k.
Basically, we would rather work with watertight concrete, but the recommendation to still work with drainage makes us suspicious and sounds a bit like a double safety net. The construction company justifies this by the pressurized water and the expected higher humidity in the basement due to capillary action.
Since we are building the house with a central ventilation system, we could quite easily connect the basement rooms to it.
We now have to decide what to do and are somewhat puzzled. What is your opinion on this? Does anyone have experience with watertight concrete and glacial till clay? Is moisture an issue here?
Thank you very much for your opinion.
we are planning the construction of a new house and want to build it with a basement. According to the soil report, the soil consists of impermeable glacial till clay up to a depth of about 5 m. Below that, there is permeable sand. There is no problem with rising groundwater here. However, surface water can be conducted to the basement wall due to the soil. The expert says that the basement could be constructed either with masonry with wall drainage panels or with watertight concrete. For masonry, ring drainage should be used and possibly a soakaway pit installed. When using watertight concrete, according to the report, no drainage is necessary.
The construction company now recommends a masonry basement with waterproofing against pressurized water and perimeter insulation boards. In addition, a ring drainage and a soakaway pit. Alternatively, one could also work with watertight concrete and open water management. In principle, they would still recommend ring drainage with a soakaway pit for the watertight concrete to avoid long-term problems.
The execution of the basement is made more expensive by these measures/recommendations by about €17k for the masonry basement, and with watertight concrete (with open water management) by €7k or watertight concrete (with ring drainage and soakaway pit) by €16k.
Basically, we would rather work with watertight concrete, but the recommendation to still work with drainage makes us suspicious and sounds a bit like a double safety net. The construction company justifies this by the pressurized water and the expected higher humidity in the basement due to capillary action.
Since we are building the house with a central ventilation system, we could quite easily connect the basement rooms to it.
We now have to decide what to do and are somewhat puzzled. What is your opinion on this? Does anyone have experience with watertight concrete and glacial till clay? Is moisture an issue here?
Thank you very much for your opinion.