I am working on drainage and will be installing double Pordrän boards. The instructions for Pordrän recommend leveling the small ledge at the bottom so that it slopes outward, which I have done with Byggmax mortar and plaster mix (https://www.byggmax.se/gjutning-och-husgrund/cement-och-bruk/mur-och-putsbruk-b-p0112). The ledge only protrudes 5-10 cm, so at the thickest point it's maybe 4 cm of mortar.
I will then apply Pordrän's floating membrane EP on this (and 10 cm up, 5 cm down, I think it was), but how long does the mortar need to cure/set before I can apply the floating membrane?
