Hello everyone,
we are currently planning an extension and renovation of our small detached house (built in 1938). I need advice regarding a potentially necessary underpinning.
The existing house has one and a half stories and a partial basement. The current (former coal) cellar has a clear height of 1.85 m (6 feet). The house base at the cellar is approximately 2.10 m (7 feet) deep. The part of the building without a basement has a strip foundation at a depth of about 80 cm (2.6 feet).
The extension is planned on the southern gable side of the house, measuring 10 x 5 m (33 x 16 feet), and would be placed partly on the cellar and partly on the non-basement section. Now my questions:
- If the extension is not basemented, is underpinning of the existing building still necessary when the extension is built with a strip foundation or a slab foundation?
- If the extension includes a basement (with a foundation footing about 2.40 m (8 feet) deep), as I understand, underpinning is definitely required. If this is done with masonry or concrete, does it have to be carried out in sections? Are there any current cost indications (per linear meter)? How much would the underpinning extend the construction time? Are there any experiences or estimates?
Thank you very much!
we are currently planning an extension and renovation of our small detached house (built in 1938). I need advice regarding a potentially necessary underpinning.
The existing house has one and a half stories and a partial basement. The current (former coal) cellar has a clear height of 1.85 m (6 feet). The house base at the cellar is approximately 2.10 m (7 feet) deep. The part of the building without a basement has a strip foundation at a depth of about 80 cm (2.6 feet).
The extension is planned on the southern gable side of the house, measuring 10 x 5 m (33 x 16 feet), and would be placed partly on the cellar and partly on the non-basement section. Now my questions:
- If the extension is not basemented, is underpinning of the existing building still necessary when the extension is built with a strip foundation or a slab foundation?
- If the extension includes a basement (with a foundation footing about 2.40 m (8 feet) deep), as I understand, underpinning is definitely required. If this is done with masonry or concrete, does it have to be carried out in sections? Are there any current cost indications (per linear meter)? How much would the underpinning extend the construction time? Are there any experiences or estimates?
Thank you very much!
ckcool1984 schrieb:
Our exterior walls on the ground floor as well as in the basement are made of 38cm (15 inches) thick brick walls.For a small house, that was above standard back then – and accordingly heavy.https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
I can’t tell you whether you need underpinning.
We have underpinning on the old retaining wall near the house.
Back then, it was determined by the structural engineer, expert, and contractor.
The work was done in 1.5 meter (5 feet) sections. They excavated 1.5 meters (5 feet), poured concrete, left 3 meters (10 feet) in between, then excavated another 1.5 meters (5 feet), and so on.
A few days later, they worked on the next 1.5 meters (5 feet), and after a few more days, the rest.
It roughly took 2 weeks.
We have underpinning on the old retaining wall near the house.
Back then, it was determined by the structural engineer, expert, and contractor.
The work was done in 1.5 meter (5 feet) sections. They excavated 1.5 meters (5 feet), poured concrete, left 3 meters (10 feet) in between, then excavated another 1.5 meters (5 feet), and so on.
A few days later, they worked on the next 1.5 meters (5 feet), and after a few more days, the rest.
It roughly took 2 weeks.
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