ᐅ New construction, basement insulation, cement plaster, bitumen coating?

Hello,

I have the following question:

What is the common procedure nowadays for new construction? I asked two people and got three different opinions ;-)

Either bitumen primer, thick bitumen coating, insulation, and then the dimpled membrane

or

cement render, bitumen coating, insulation, and then the dimpled membrane?

Basically, it’s about whether I should plaster the masonry first and then apply only the bitumen coating, or skip the plaster and replace it with the thick bitumen layer.
Which option is better or more cost-effective?

Thank you very much

What is the plaster for? I would go with the first option...

In my opinion, neither of the two options is completely optimal.

Since I am currently working on a construction site where we are applying the building waterproofing, I would recommend the following approach:

- Primer coat on the bare masonry
- Waterproofing membrane (make sure it is two-layered!)
- Sealing penetrations (e.g., electrical, gas, telephone, etc.) with liquid applied membrane
- Insulation (installed in two layers to prevent thermal bridges at the joints)
- If necessary, a drainage sheet (dimpled membrane) if the insulation is not water-resistant/water-repellent

If you want to be absolutely sure, you can also install edge strips at the top and bottom of the waterproofing membranes, although in my opinion this makes little sense, as the weight and pressure of the soil should prevent the membranes from sagging anyway.