basement waterproofing at the base of a mountain during 100mm per day rain.

Basement waterproofing at the base of a mountain during 100mm per day rain. Three days from pouring water to dry.
There is a lot of salt in the substrate of this wall which will likely cause the membrane to delaminate if the salts dry behind the membrane.
Cementitious membranes are not vapour proof barriers, water vapour can still evaporate through the membrane slowly. The salt molecules however are too large to pass through the membrane so they accumulate behind the membrane. As the salt crystals accumulate with high volume they can break the bond between the masonry and the membrane causing the membrane to crack and the crack in the membrane will obviously let the water escape from the wall once again.
This is not membrane failure. This is mechanical damage to the membrane from the accumulation of salt deposits behind the membrane.
Salt crystallises at around 300mpa. Your standard residential concrete is around 25mpa. The crystallisation of salt is a chemical reaction of (for example) sodium and chloride bonding together as they move from a liquid state back to solid (a crystal).
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