Unplanned retaining wall

2017-07-28 20:46:06

We had originally also planned to build with a slab foundation on a slope. But then the neighbor completely excavated towards our property, so that at a distance of 3.10m a height difference of about 2 meters to our ground floor screed level was created. Of course, the neighbor has to secure that, but I did not want to be dependent on his retaining walls. So redesign to a basement, additional costs including earthworks at about €90,000.

2017-07-28 20:57:11

Yes, foundation slab on a slope. I have drawn it with all my skill (see attachment).

1) Sidewalk
2) Street
3) House
4) Wall

There are about 3m between the house and the wall. The drawing is of course not to scale. The steps behind the wall are wider and not all that high. And I don't think there are that many either.

The L-stones are supposed to have an L-stone dimension (do I understand correctly that this is not the height, but that the foot is included?) of 2.8-3.1m.

I will address the basement, but I suspect it is too late for that (everything is already planned and approved) and a basement would probably be more expensive than €22k, right? Of course, you would then have to partly deduct the money for the thermal foundation slab, but I still think the basement would be more expensive, right?

Are all civil engineering services included in your construction contract, i.e., more than just the excavation work? Or are there still separate civil engineering contracts to be awarded? In your location, additional costs could quickly arise due to the creation of an access route or parking spaces for equipment...

2017-07-29 07:45:26

Hello, before you hire the construction company for a lot of money, you should consult with a structural engineer again. With a load dispersion angle of 45 degrees from the bottom edge of the slab, the retaining wall according to your sketch doesn’t actually carry that much load. Possibly, a slightly thicker slab or a reinforced stiffened foundation is enough to make the retaining wall load-free. However, you then live with the risk that the old retaining wall might one day end up in your garden, but surely the retaining wall could also be reinforced. There are always many options before you have to demolish everything and rebuild.

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Unplanned retaining wall

Marvinius II

Marvinius II

BratacDD