I am confused after discussing with an engineer from a waterproofing specialist. He said that additive added to concrete or screeding for waterproofing purpose could not be waterproof but just to decrease the porosity of concrete and screeding. Therefore, waterproofing screeding is NOT waterproof. In other words, only waterproofing lying can be treated as fully waterproof treatment. Would anyone introduce some link or technical paper for this issue.
Thank you in advance.
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