Waterproofing is a system or treatment intended to resist liquid-water passage under specified conditions. Performance depends on design, preparation and installation details.
What this means at your property
A coating on a wall does not automatically correct roof leakage, plumbing faults or poor drainage. Joints, transitions and penetrations remain important even when the main surface uses a waterproofing product.
What should a proposal demonstrate?
Ask which water-entry mechanism was identified and how the selected system addresses it. Identify substrate preparation, detailing, drainage connections and maintenance requirements, and clarify the limits of any product or workmanship warranty.