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What is the best waterproofing application and materials in tunnel construction or even buildings below the ground?

What is the best waterproofing application and materials in tunnel construction or even buildings below the ground?


There are two waterproofing specification suggested. The cementitious and the polyurethane one. I am afraid because the application is too costly when the choice is wrong. I would like to know the advantage and disadvantage of the two suggested material. Application to wall and to floors of the underground structure is critical.



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