Yes, they might lock into each other by default. I hadn't thought of that.
 
Hello,
Curious about how this build turned out!? Considering something similar. What do you think about this solution?

Diagram showing a sectional view of a garage foundation using lightweight concrete, ISODRÄN, aggregate layers, and structural elements.
 
Hi, I didn't receive a notification about posts in the thread so I missed your post. But for the future and for others looking to solve similar problems, I contacted an engineer about this and discussed various solutions. The strongest is L-support.

So the solution was 3 m high custom-cast 20KN L-supports, enormous..., assembled according to the factory's recommendations (inter-casting in grooves) and bolted together with iron on it. These L-supports run along the entire body of the house and additionally towards the neighbor, creating an extra parking space. Between the L-supports and the house, there are isodränskivor. Under the L-supports, there are drains. On the inside of the L-supports, there is a Platon mat and additional drainage. At the top of the house, there is plastic protection from above so no water comes in from downpours.

It became very expensive, but I feel confident that neither water nor ground pressure will occur and press against the house. It hasn't moved in 3 years so far, and there have been large trucks here afterward (construction of garage, driveway, etc.).

If you live nearby (southern 08), you're welcome to come and take a look if you want :)
 
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Hello.
I read your thread. Didn't anyone suggest/talk about using foam board as a base and gravel on top to reduce ground pressure?
 
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