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Basement Waterproofing Systems

Excavation and Coating Methods

Outside excavation and coating methods of waterproofing can be effective, but can also be costly. Exterior excavation is commonly done when there is water penetration through the walls, in order to expose the exterior wall surface and apply a waterproofing coating or membrane. This method is usually effective, if done correctly, to stop water penetration through the walls. The major drawback to excavation is the additional expenses incurred in removal and replacement of any sidewalk and/or driveway, deck, plantings and anything else that may be close to the wall you are planning to excavate around. Make sure this is all discussed, planned and budgeted for with your contractor when deciding to utilize this method of basement waterproofing.

French Drain Systems

Another commonly known method is diverting surface water away from the foundation by the creation of a French Drain. This essentially is a trench, often containing perforated pipe covered with gravel or rock that redirects surface water away from an area. It involves the laying of pipe and utilizes gravity to drain water from a high point to a low point some distance away. It can involve chopping up and replacing established landscaping and concrete. A French Drain can last for some time without maintenance, but it can become clogged with sediment and cause a backup into the basement.

French Drains with Sump Pumps

In cases involving hydrostatic pressure (water pressure from things such as underground springs, rivers, ground water, high water tables, etc.), the solution is twofold: to relieve the pressure under the floor and around the foundation perimeter, and divert the water to a point where it can be pumped out or otherwise removed from the basement. Installation of a sump pump raises the water to a level where it can be carried off at or below ground level.

This basement waterproofing method controls ground water by cutting a trench along the wall, laying in perforated pipe and leading it to a pit in the floor (drain tile), installing a poly or metal sump liner to prevent caving in of the sides of the sump pit, and surrounding the sump liner with stones. After the lines are installed, the trench must be filled with gravel, bleeders should be installed in the block walls and the floor resealed with concrete. The sump pit then collects the water directed to it from the drain tile system and a sump pump or drain takes the water out of the basement.

Essentially, the sump pit is a hole where water gathers and must be emptied regularly in order to prevent overflow. The sump pump installed in the pit is automatically activated to drain the water out when it reaches a certain level. Pumps are designed to operate automatically and generally have a check valve on the water outlet pipe so water does not flow back into the sump when the pump shuts off. This type of system effectively controls any water that would usually enter your basement when it rains heavily enough, and in essence, “waterproofs” your basement.

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