Create sidewalk and parking lot from concrete

What do you think a forum is for then? For discussion about a topic and for gathering information about a topic.

If I had enough money to pay several hundred euros for a structural engineer for a sidewalk or the wall thickness for a pool wall, then I could also have it done by a company.

In my opinion, a forum is made up of people who either have experience through their education in the field and can therefore provide answers OR have implemented it themselves and can report from their experience.

Everything that concerns static matters should be calculated by a professional. No one knows the local conditions. There is a significant difference whether it is a walkway or a walkway that simultaneously serves as a basement ceiling. And whether, for example, excavations for a pool are carried out directly next to a house, whether groundwater or [Schichtenwasser] is present, no one knows here either. Therefore, everything is very negligent (including the answers from some here).

So, this weekend I’m going to the hardware store to buy materials so that I can hopefully finish everything before the onset of winter. I have actually decided against concrete. Now, porcelain stoneware terrace slabs in 120x60x2 cm will be laid.

Now I have a question about the construction and will therefore refer back to this topic without opening a new thread.

Once again, a brief summary of the situation: The slabs will be placed at the house entrance. There is a basement room as a substructure that is built with solid masonry and has a reinforced concrete ceiling. A layer of screed with a slope has already been applied on top.

I want to build up as follows:

- Apply a layer of waterproof slurry on the screed and at the transition to the house wall and insert a tape in the edge area towards the house so that everything is sealed there. I would apply the waterproof slurry directly to a thickness of 1.5 cm with a trowel.
- Then a layer about 3 cm thick of natural stone laying mortar on the waterproof slurry, since it contains trass and therefore there will be little to no efflorescence caused by moisture.
- Then lay the terrace slabs with flexible adhesive onto the still moist mortar on the back and press them in with a rubber mallet to level them.

Is this sufficient to avoid moisture problems in the basement room below or do I need to insert a drainage mat between the waterproof slurry and the natural stone laying mortar? Is one layer of waterproof slurry enough or should another material be used?

Thanks for your answers.