Waterproofing the exterior foundation walls requires excavating down to the bottom of the foundation. (Remember, any obstacles including; driveways, sidewalks, decks, patio rooms, landscape lighting, sprinkler systems, plants, shrubs and etc. will need to be removed and also re-installed which can be very costly.) Once the soil is removed and hauled away, the walls are scraped, power washed and inspected for cracks and a new waterproofing material is applied. New 4 inch PVC drainage pipe is then installed alongside the footing at the bottom of the foundation wall which drains to city sewers or a sump pump. Washed stone is then used to cover and surround the new drainage pipe. The open trench is then backfilled with washed stone and topped off with new soil. This system is costly and used for the most extreme situations.