ᐅ Gravel Base for Terrace - Waterproofing?!

Hello everyone,

For our house (no basement, concrete slab foundation), we are about to build the terrace.
It will have a gravel base, then crushed stone, and finally the surface layer.

Now I’m wondering:
Should I plaster the area of the base wall that will be covered by gravel and crushed stone beforehand?
There is a bituminous coating and insulation already applied. Should I also apply base plaster now?
And then a dimpled membrane?
Or is it enough to just put gravel there and leave it at that?

Attached is a quick "example photo."

Thanks and best regards

We had the terrace redone. From what I saw, we had a dimple membrane or skirt, as it is called, around the base.

Is gravel still used today? A few days ago, we were told that this type of terrace paving has been replaced by a kind of pedestal system. Four slabs rest on a pedestal at the intersection point.

Thick coating followed by base plaster, dimpled membrane, then mineral concrete, and ideally a drainage system in front or a birk drain.

Schimi1791 schrieb:

Is gravel still used today? A few days ago, we were told that this type of terrace installation has been replaced by some kind of pedestals. Four slabs rest on a pedestal at the intersection point.

Sorry for the late reply:

Those pedestals are called adjustable supports.
Nice solution, but you need a sufficiently level, concrete base for that (at least I don't know any other way). We don’t have that, so we are using the traditional method.

tomtom79 schrieb:

Thick coating, then base plaster, dimpled membrane, followed by lightweight concrete, and ideally drainage in front or a Birkorinne.

We are doing it similarly now.
An acquaintance who has been a site manager at a concrete house builder for years would do it "for himself" as follows:

Glue the missing Styrofoam insulation,
then base plaster/reinforcing mortar with reinforcement (because plaster on Styrofoam),
then waterproof slurry and in front of that the dimpled membrane.

This should cover everything.