We don’t want water in our house. Any water.
Belt and Braces
If, somehow, water gets past the Preprufe membrane, it needs to get through 10 inches of concrete. Since we poured a concrete slab and then put in shotcrete vertical retaining walls, there will be a ‘cold joint’ where the concrete slab meets the vertical retaining walls. Cold joints represent weaker areas where it is easier for water to penetrate.
To add additional protection in the cold joint, Bill Brown recommended (ok, he specified) that we use SuperStop in the cold joint. SuperStop is a bentonite strip that goes inside the joint in the concrete slab and if any water penetrates the cold joint then the bentonite will expand and seal the leak.