Embankment with RCL? Land about 60cm too low

Hello,

first of all, thank you very much for this forum! I read many useful posts here. Now to my question:

Unfortunately, our plot is about one meter below street level, the house itself is already planned and a construction company (GU) has also been found and signed, no basement is planned. Since we do not want to build too far below street level, the current compromise (this is also what was submitted to the building authority) is to raise the plot slightly (still below street level); the neighbors did this years ago. According to the soil survey, we have 20-30 cm of topsoil, which of course must be removed. Afterwards, we would have to fill about 50 cm (according to the soil survey, with RCL 45). A load-bearing slab will then be poured on top. The base area, +1 m on each side, of the house is about 95 m2. According to my calculation, that would be about 47.5 m3, so (according to an online calculator) about 90 tons of RCL.

My GU offers me a price of €48 per ton of RCL including delivery, compaction, etc.

Now to the questions:
- Does it even make sense to gravel up that high?
- Is the price per ton reasonable? I mean, I don’t have much choice left, but purely out of interest.

Many thanks & regards

Hello,
so 1m3 of RC material weighs approx. 1470 kg. There are many combinations, the decisive factor is that it is suitable and tested for the foundation. I pay 40 € for installed recycled gravel. Don’t you have a soil report? It should state which materials are recommended.

Are the 60 cm over the entire property?

If you pile up the floor slab, do you have stairs to the garden?

Or do you also want to pile up earth then?

Hello, so 1m3 of RC material weighs about 1470 kg. There are many combinations, the decisive factor is that it is suitable and tested for the foundation. I pay 40 € for recycled gravel installed. Don’t you have a soil report? It should say which materials are recommended there.

Well, the soil report says RC 45 grain size would be acceptable. Hence the question.

Are the 60 cm spread over the entire property?

If you pile up the base slab, do you have a staircase leading into the garden?

Or do you also want to pile up earth then?

I will pile up the rest of the garden with normal soil so that it fits. As far as I know, this does not have to be a special material but, if in doubt, topsoil from another construction site. Of course, what is under the base slab is important, that is not possible.. in the garden I have no problem if the piled up soil settles over time and I have to "top it up" again.