ᐅ Is a drainage membrane absolutely necessary? Eaves strip, splash protection

I have already used the search function but haven’t found any precise information yet.
We are building a new single-family house with a slab-on-grade foundation, KfW70 standard, using 36cm (14 inch) solid bricks. The slab was insulated before pouring: first the wooden formwork was set up, then the insulation, followed by reinforcement, and finally the concrete.
The base area was treated with a waterproofing slurry (also approved by our construction expert). The base has a special base coat plaster and was painted with base paint.
We have now had the terrain around the house raised and compacted by 25cm (10 inches) using recycled concrete aggregate (RCA). On top of that, gravel and paving or a terrace will be laid in the near future. Directly next to the base, in the area not protected from rain, we want to install a drip strip.
Yesterday, someone told us that we absolutely should have installed a dimpled membrane (also called a drainage membrane or cavity membrane). Nice to get this tip a day later. Neither our builder nor our expert mentioned this. The latter only said that we should install the drip strip.

What do you think? Should we tear up the entire base area and install the dimpled membrane now? Or is it too late for any benefit?

Thanks in advance for your answers.

Since you have an expert who is familiar with all the conditions on site, I would recommend checking with the expert again regarding this matter.

Yes, thanks, I will do that first thing on Monday. It just fit perfectly with Friday, leaving you unsure for a full two days.

Always install dimpled membrane! The base of the wall is unprotected against rising damp.
Leave the membrane in place until the splash guard is completed, paved, and swept.
Only then cut the membrane so that it aligns with the splash guard.

I assume your general contractor provided you with various informational materials, for example, on proper ventilation or which chemicals should not be used for cleaning the windows...
Perhaps the information about the dimpled membrane is included there as well.
We were already informed about this during the pre-planning meeting. It also states in the building specifications that this is to be done by the homeowner.

Check your documents to confirm.

We have already gone through our documents and the construction specifications thoroughly and found nothing.
We also did not receive anything like what you are describing. There was no information on proper ventilation, either—I even asked the screed installer in person about this.
To be honest, I can imagine that our general contractor deliberately withheld this information. I wouldn’t put anything past them. They would probably say it’s our own fault for not asking, but you can’t ask about something you don’t know exists.
My research shows that in our case, the studded membrane is not necessarily intended as a moisture barrier, but rather to protect the base from damage caused by the backfill material. Since the base in our case has already been waterproofed against moisture, there might be a risk that the moisture protection could be compromised if damaged.
Is it even possible to expose the base afterwards without damaging it?

Man, it’s such a long wait until Monday...

Our base was also waterproofed. It consists of several layers of reinforcing mesh and plaster, followed by a coat of paint. Still, we need to protect it from moisture, since sand and stones could damage the protective layer.

I believe it’s possible to address this issue again. This would also be the case during a renovation. However, in your situation, I would recommend consulting the expert beforehand. After all, this concerns warranty claims against the general contractor.

Who did you build with? Feel free to send a private message.