Hello everyone,
This question has been asked many times and you have always provided great answers.
We have the old problem again but with a small change.
We are building without a basement, and the neighbor has a basement.
We agreed that the neighbor will start first with their basement wall on our side, and then the underpinning will be built on that wall. The costs will be shared.
Now the question came up: if we build with a two-week gap instead of a 1–2 year gap, do we still need the underpinning at all?
The neighbor is increasing the thickness of the basement concrete wall from 17cm (7 inches) to 26cm (10 inches) to get better support.
We will fill in soil and compact it until it is sufficient to support the foundation slab.
There are different opinions on this. We will consult the structural engineer for advice.
Could you please also help us with your advice?
Thank you in advance,
HarryBo
This question has been asked many times and you have always provided great answers.
We have the old problem again but with a small change.
We are building without a basement, and the neighbor has a basement.
We agreed that the neighbor will start first with their basement wall on our side, and then the underpinning will be built on that wall. The costs will be shared.
Now the question came up: if we build with a two-week gap instead of a 1–2 year gap, do we still need the underpinning at all?
The neighbor is increasing the thickness of the basement concrete wall from 17cm (7 inches) to 26cm (10 inches) to get better support.
We will fill in soil and compact it until it is sufficient to support the foundation slab.
There are different opinions on this. We will consult the structural engineer for advice.
Could you please also help us with your advice?
Thank you in advance,
HarryBo
H
Harrybo19818 Feb 2021 14:52Hello everyone,
Thank you for your replies.
We have made some progress. We are waiting until the neighbor’s basement is finished. Our house has been taken into account in the neighbor’s structural design.
Unfortunately, our structural engineer says that our house will only remain stable as long as the neighbor’s house is not demolished. The risk is always there.
The neighbor might also be concerned that the load from our house will be transferred onto their walls, which could cause cracks later on.
The suggestion was to build underpinning to prevent such problems in the future.
We waited until the basement was completed, so this will avoid issues related to underpinning.
We agreed to build a strip foundation and either concrete walls or piles will be installed within it.
Whether the distance is 30 cm (12 inches) or 1 m (39 inches) will still be calculated. The shared wall is 12 m (39 feet) long.
We will see how to best resolve this and how to share the costs. Currently, the retaining wall is only for us, so the neighbor is not involved with it.
Thanks in advance,
Regards,
Harish B
Thank you for your replies.
We have made some progress. We are waiting until the neighbor’s basement is finished. Our house has been taken into account in the neighbor’s structural design.
Unfortunately, our structural engineer says that our house will only remain stable as long as the neighbor’s house is not demolished. The risk is always there.
The neighbor might also be concerned that the load from our house will be transferred onto their walls, which could cause cracks later on.
The suggestion was to build underpinning to prevent such problems in the future.
We waited until the basement was completed, so this will avoid issues related to underpinning.
We agreed to build a strip foundation and either concrete walls or piles will be installed within it.
Whether the distance is 30 cm (12 inches) or 1 m (39 inches) will still be calculated. The shared wall is 12 m (39 feet) long.
We will see how to best resolve this and how to share the costs. Currently, the retaining wall is only for us, so the neighbor is not involved with it.
Thanks in advance,
Regards,
Harish B
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