I actually have a question about that. Our neighbors also had a platform poured. The setup was as follows: normal soil then 30-40cm of sand about 20cm of concrete with steel mesh. Now the curious part in my opinion. The steel mesh was actually partially drilled INTO the clinker brick. Also, there was no studded membrane or similar between the front door and the concrete. No machine was used, at most a hand tamper was used. Now I wonder if the whole platform won’t settle over time and the platform will then hang on the clinker brick because steel mesh was incorporated there.