To solve the leaky foundation problem in advance requires attention to: site conditions, proper specifications and details, project scheduling, choice of the correct waterproofing material, protecting the membrane, and quality of application of the proper waterproofing material. Three of the many methods to make excavations moisture-free are described: dewatering systems- these methods use subsurface drains or well points to provide a means of pumping or drawing water out of the excavation continually until the foundation has been made water tight. Freeze wall design- this consists of pumping a brine solution into the earth at specified intervals to build a strong ice wall; slurry trench- this method , while very expensive ,fills a need in the industry where conditions call for it. Specifications and details for a job below grade must indicate proper method for building a watertight envelope around foundation walls, base slab, terminations and projections. Foundation waterproofing operations must be planned in terms of the overall construction schedule. For example, the base slab and foundation walls should be allowed to cure thoroughly and then dry of minimum of 28 days before the waterproofing system is applied. This period will aviate the problem that arises when entrapped moisture in the concrete blows the waterproofing system off. This period also permits shrinkage cracking to develop. Ideally, though often impractical, foundation waterproofing below grade should be delayed until the entire superstructure is built so that most of the weight is already on the foundation walls and all deflection and shrinkage cracking is completed.