Hello everyone,
briefly outlining the situation. It’s a single-family house from 1948, so it was built quite simply. The wall is 36cm (14 inches) thick with a cavity. According to the neighbor, the house was supposed to be replastered in the 1970s, but when the plaster was removed, the bricks became loose, so the walls were opened up, filled with concrete, and then insulated with “sauerkraut boards.” Unfortunately, this was not done in the basement. When I drill here, individual bricks move.
Now, a detached extension is planned.
My concern is that the old building might be damaged.
1. Increased load on the basement walls due to concrete in the upper walls.
2. Lack of earth pressure when excavating the strip foundation.
3. Vibrations during compaction.
I want to reinforce the old basement wall. My idea would also be to open the wall and fill it with concrete. However, in the timber-frame forum, someone advised against fully filling a cavity wall with concrete. What are the reasons against this? If the concrete pressure is too high, I could also pour it in layers. Partially digging out the wall and gradually building the strip foundation in front of it seems much more complicated to me.
Thanks for your advice.
briefly outlining the situation. It’s a single-family house from 1948, so it was built quite simply. The wall is 36cm (14 inches) thick with a cavity. According to the neighbor, the house was supposed to be replastered in the 1970s, but when the plaster was removed, the bricks became loose, so the walls were opened up, filled with concrete, and then insulated with “sauerkraut boards.” Unfortunately, this was not done in the basement. When I drill here, individual bricks move.
Now, a detached extension is planned.
My concern is that the old building might be damaged.
1. Increased load on the basement walls due to concrete in the upper walls.
2. Lack of earth pressure when excavating the strip foundation.
3. Vibrations during compaction.
I want to reinforce the old basement wall. My idea would also be to open the wall and fill it with concrete. However, in the timber-frame forum, someone advised against fully filling a cavity wall with concrete. What are the reasons against this? If the concrete pressure is too high, I could also pour it in layers. Partially digging out the wall and gradually building the strip foundation in front of it seems much more complicated to me.
Thanks for your advice.
In der Ruine8 Sep 2021 21:3611ant schrieb:
The exposed part looks like the foundation / ground floor. Get the building records, otherwise you can’t really compare such spot checks with the plan. That is already the basement wall. The basement extends about 1m (3 feet) above ground. I’ll check the plans from 1948 tomorrow.
In der Ruine9 Sep 2021 08:56The structural engineer states that if DIN 4123 is followed, excavation without support is not a problem. However, DIN requires excavation to be done in sections. So, not all at once after all.
It looks like the ground floor is supposed to be built up with the same wall thickness (which would be unusual). Were the plans created before the war, and was permission then possibly obtained or extended based on the old plans, but with improvisation due to the postwar material market situation?
Where exactly are you planning to build the extension?
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
Where exactly are you planning to build the extension?
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
In der Ruine9 Sep 2021 12:10You’re not asking me now about the shady dealings that happened shortly after the war, are you? Nobody knows anymore. I only know that the building materials come from the Berlin rubble heaps. Ecological recycling more than 70 years ago. Only the mortar was missing, which you can tell from the masonry. The extension is based on the first plan "below".
In der Ruine schrieb:
I only know that the building materials come from the rubble piles in Berlin.
Ecological recycling more than 70 years ago. Only the mortar was missing, which you can tell from the masonry. No, that doesn’t seem to explain the entire discrepancy.
In der Ruine schrieb:
The extension is according to the first plan, "below." So on the gable side. Please show the ground floor (existing floor plan).
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
In der Ruine9 Sep 2021 12:51Sorry, but "above" in the plan. The bathroom window will become the door.
The structural engineer will come by again next week.
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