Load spread angle at foundation neglected

Good morning,

I have a problem. We are building a house with a Swedish ground slab (load-bearing insulation under the concrete - only on one side a strip foundation because of the garage attached to the house.
Now the earthworks company was here and in my opinion made a mistake.

They excavated the ground according to the soil report down to the load-bearing layer and then filled and compacted up to street level with F1 gravel to a height of 1.9m. BUT:

This cushion is all around only 50cm larger than the house footprint.
(House is 11.5 x 9m / The foundation cushion is 12.5 x 10m)
I heard a long time ago that a foundation cushion must always be larger on each house side by the size of its height.

So here it should have been built: 15.3 x 12.8m.

My architect says I should ask the structural engineer. The structural engineer says I must clarify this with the ground slab manufacturer. – He in turn says the earthworks contractor should know everything. GREAT. Everyone is leaving me hanging and I bet everyone knows.

In parallel, I have commissioned an expert who can only come to the construction site on 27.01. Until then, construction is stopped.

The earthworks company says it is sufficient because my house will not be as heavy as others since I am building with wood and the ground slab transfers the load evenly into the ground and not at the usual load transfer angle. – He is not aware of any fault.

I am cautiously asking here in advance if anyone can say from experience what might happen. Or maybe someone has had a similar situation before.

Thanks + best regards

oh yes, what the earthworks construction manager also said is that everything is OK, as the dynamic plate load test delivered best results twice. (He was really proud of that)

What does the soil report say about the backfilling?

Who determined the filling material?

Who gave which orders to whom?

The expert clearly stated that he cannot say anything about the load distribution angle; he said that in the report he only has to point out that it must be considered. The fill material was specified by the base slab. It was called F1 gravel, compacted every 20 cm. (The report states "base course material - gravel" - the civil engineer said it is the same.) I gave the orders to the civil engineer and the expert. But always everything after consulting with everyone else, so I did not make a single decision on my own.

A load distribution angle with about 80 cm width was made for us. 50 cm would have sufficed as well.

Our civil engineer was actually a professional (and still followed #-Safety), and if it were as you claim, then our foundation wouldn't have fit on the property in some places anymore. So honestly, I consider that a rumor.

If the backfilling with gravel was done according to the specifications of the soil report, it should be fine for you at the construction site with a wooden frame house.

Regards
Thorsten

PS: During the installation of gas/water/electricity, the nice city at that time installed it 5 cm from the house wall. Crazy!!. Completely destroyed the angle on one side over more than 4 meters. It was a huge hassle until they repaired everything and rerouted it differently…..

So a RWE construction consultant told us that some time ago. Apparently, this also depends on the height of the foundation cushion. If you have 80cm around your house, you will have filled up a maximum of 80cm, right?

This is also stated in an RWE soil consultant.

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Good day,

link removed; please observe the forum rules.

Thank you very much!
Construction expert