ᐅ Backfilling and compacting the excavation pit immediately after erecting the basement walls?

Hello everyone,

We are currently formwork and pouring the basement walls.
Most of the excavated soil has been stored on the neighboring property, whose general contractor said construction would not start until February next year. Therefore, the neighbor allowed me to keep the excavation material on their land.
Now, however, the general contractor wants to start in about two weeks, so I need to remove the soil. I want to avoid any conflict with the neighbor and must decide whether to have the soil hauled away or to backfill it now.

So here is my question:
As soon as the basement walls (just the exterior walls – 24cm (9.5 inches) thick) are in place, without interior walls or ceiling, can I backfill the excavation pit with the soil and compact it? Or are the walls not stable enough without load-bearing interior walls and a ceiling?

It would be great to find someone who knows this or has already done it that way.

The concrete should cure for about 1 month.
You still need to seal and insulate.
Whether it will be stable enough without a ceiling or if you will need supports can only be determined by a structural engineer.
You will have to dig up again for all the utility connections...
You won’t be able to manage that in two weeks.
I would get a statement from a structural engineer and then proceed accordingly. Is the neighboring property also so small that the excavation material has to be removed?
How much are we actually talking about?

So, it’s about 100 cubic meters (130 cubic yards). The neighbor needs enough space for their own excavation... The architect said it “shouldn't be a problem.” I also thought it was quite risky. I could manage the insulation and compaction so far, as well as laying the pipes. But if the walls shift even slightly, it’s definitely too risky for me, and I will probably have to dispose of the excavation material and order new materials...

Has it been clarified whether your excavation material can actually be compacted?

goalkeeper schrieb:

Has it been confirmed whether your excavation soil is compactable at all?

yes

You can fill at least 50% of the walls without any concerns, even without interior walls and a ceiling. This is common practice. You take the rest and just dump it in a corner of your property.

What’s the problem?