Internal drainage system (Internal waterproofing)

Foundation interior drainage systems are one of the most important aspects of residential construction. Because these systems are buried and cannot be easily modified or corrected, it is vitally important that they are installed correctly.

Foundation drainage systems, which are installed properly, can serve a dual role. Foundation drain tile systems are the means by which groundwater can be transported away from your basement. If you want a dry basement and sound foundation, you must have an adequate foundation drainage system. The water content in the soil surrounding your house can fluctuate seasonally. There is always a point at which you can dig and hit water.

DrainageGeologists often refer to this as the water table. This water table rises and falls in response to the amount of precipitation in any given time period. Water will take the path of least resistance. If there is no exterior waterproofing water can go sideways through a crack in your foundation, or it can go down alongside your foundation into a pipe.

Interior drainage systems work extremely well for many customers. Depending on your circumstances, this may be an effective solution. Many water control system companies claim to be waterproofers and offer this method as a solution to every basement water problem. If a company proposes opening the floor on the inside for any reason, they are offering an interior drainage system. Only an exterior excavation to the footer or bottom of the foundation accomplishes waterproofing.


Pressure relief systems, also known as drainage systems and French drains, are an extremely efficient way to prevent water seepage through the basement floor caused by hydrostatic pressure. Hydrostatic pressure is a force exerted by water against an item such as a foundation.

When the groundwater levels outside the basement rise above the level of the floor, the basement acts like a boat in a pond. If a boat is sitting in water, water will leak in through any open cracks, holes or porous areas. It works the same way with a basement. Hydrostatic pressure can push water through hairline cracks. Symptoms of this are water coming up through the basement floor or water coming in at multiple locations.

Properly installed systems will remove the water before it has a chance to rise above the level of the basement floor. This water is then diverted to a sump well recessed in the floor where a pump discharges it to a safe and legal location. To accomplish this there are two popular methods of installation on today’s market, the top of footer method and the deep system method.