Sealing terrace area against moisture

Hello everyone,
I am currently working on protecting the facade in the terrace area against moisture. It is a house without a basement, built with a timber frame construction. So far, I have applied a layer of sealing slurry. The plan is to install a dimpled membrane before filling with gravel. However, I am concerned that the dimpled membrane might be damaged during the compaction of the gravel due to the existing cavities between the facade and the foundation slab (see photo). Does anyone have a tip for this? Or another idea for the waterproofing?

Is drainage needed in front of the terrace door if a terrace roof will be built soon?

I would appreciate some feedback.

Thank you in advance and best regards

I am currently working on that as well. Always apply sealing slurry in 2 layers. I would install a channel despite having a roof; there are nice narrow "design channels" if you want it to be a bit less noticeable. Even though I have a conservatory, I chose a standard channel from ACO, just with a somewhat "nicer" grate. You place the channel directly in front of the window - as close as possible for you. As backfill protection, we lay a studded membrane with fleece, but cut it off below the patio slabs and then continue with the ceramic tiles up to the facade. But only where the patio roof is to visually avoid this "gap." For the rest of the house, we extend the membrane up to the terrain surface.