APPLY a masonry waterproofing product to the bare interior walls of the If the foil test showed that water soaks into the basement walls and leaves them damp, seal the inside of the walls with a high-quality waterproof paint, such as DRYLOK White Extreme Waterproof (available from Home Depot). Interior waterproofing methods, such as waterproof sealants, also help keep moisture levels low and prevent condensation. These coatings can be placed on the walls and floors of the basement creating a waterproof barrier. While these interior sealants are an important step in the overall waterproofing process, they do not address the underlying issues that cause moisture.
The biggest problems are usually found on the outside. Waterproofing is only necessary if you don't want the water to be damaged. If you manage it as an uninhabited outdoor space, you can live and let live and apply steam waterproofing on the roof above. Exterior waterproofing involves digging around the house to the full depth of the foundation walls, then installing a waterproof layer or membrane covered by drainage panels.
Meanwhile, in the real world, digging outside and applying waterproofing of walls there, together with a perimeter drainage system, is the only truly effective waterproofing. Exterior waterproofing is based on a waterproof membrane sprayed or brushed onto the outer face of the foundation walls of a house to create a barrier against water. The basement waterproofing industry has evolved a lot in recent decades in the development of hybrid basement waterproofing systems that are more effective with water flow than old-fashioned pipes and gravel, and require much less labor.