Most homeowners don’t think about their foundation until something goes wrong. A damp corner in the basement. A musty smell. Water pooling after heavy rain. And when the panic kicks in, most “waterproofing companies” rush in with the same solution: Fix the problem from the inside. Seal the crack from the basement.Install interior drains.Add a sump pump.Paint the walls.Hide the symptoms. But here’s the truth that homeowners rarely hear: Interior systems don’t stop water from g