How do I waterproof a foundation from the inside?

Kurt Brenner Published: Nov. 14, 2017, 9:47 a.m.Last updated: Nov. 30, 2019, 1:44 p.m.

We have a self-adhesive membrane on the outside wall of our foundation but the water enters through the joint between the walls and the floor. How can I waterproof this? The house is only 3 years old so the French drains shouldn't be clogged, though the ground does not slope away from the foundation so we know we will have to change that. 

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