Just ask the neighbors. Did they drill into the rock?
The geologist should know from experience what to expect there.
The foundation recommendations are quite clear.
I see no need for drilling. In my opinion, the report meets the requirements of the building authority.
Since the foundation is supposed to go down to the rock anyway, I don’t see what the drilling should achieve.
Since rock was detected in all test pits, I see the probability that there is none somewhere as rather low.
How expensive is the excavation in the rock?
I wrote to the neighbors yesterday and am still waiting for a reply. We probably have an architect, but I of course found him just before his vacation; he should be back next week, then we’ll discuss everything together.
Basically, it’s only about being able to estimate the earthworks. I would be fine if the slab is solid. Apparently, that would save me the waterproof concrete basement (according to the managing director of the soil surveyor) and some foundation work.
It basically is just about being able to estimate the earthworks. I would be fine if the slab is solid. Apparently, that saves me the WU basement (according to the managing director of the soil expert) and some on the foundation.
Which slab? If walls are backfilled, always build WU. Regardless of whether basement or underground level.
The rock slab, sorry. I meant a solid rock. I am only interested in the 4 m below ground level or 2 m above street level. If it is only a 50 cm rock slab, the earthworks will probably cost me less but the foundation more.
The engineer of the soil surveyor said that if there is continuous rock, I can save myself the waterproof basement if I install drainage around the house. Do you have a different opinion?