The basic theory of exterior waterproofing is very simple: the below-grade walls are provided with a waterproof covering that will force water to soak down the wall to be absorbed by drains at the base of the wall. The main advantage of this approach is that when installed properly, with no water table problem, it can provide a completely dry basement. The biggest disadvantage to this approach is that when it wears out or fails, it can be very difficult, expensive, or even impossible to replace because of landscaping and /or structures built over the back-fill area such as decks, porches, additions, paving, etc. Another major disadvantage of exterior waterproofing is that it cannot stop water from rising under the basement floor, as in the case of a high water table or perched water table. Fortunately, our Dry-Tec sub-floor system is installed without exterior excavation necessary. Our system is an affordable, permanent solution to one of the most frustrating and exhausting headaches a homeowner can endure. With our proven design, we confidently provide a full Life of the Structure Warranty for all our Dry-Tec waterproofing systems.