Land Studies for the State of Virginia

This set of diagrams illustrates how the Northern Virginia area largely falls within the Piedmont geological region. This region is challenged by water events, movement, and settlement. Red clay is a prominent sediment. It is dense, swells with the addition of water, and is slow to drain. It is known to create a gradual “sponging effect” against residential foundations.

Print Virginia Regions without Counties.tif (1 page)



March 17, 2014   No Comments

Water Table in the Backfill

This diagram is a simpler illustration of the water table that forms against your foundation after a heavy rain, or when your home is located along the path of traveling above- or below-ground water sources. The below diagram shows the resulting hydrostatic pressure that forms in greater detail. The reason why it’s confined to the area as depicted goes back to when your home was built. The original dig and backfill that followed has less integrity than the surrounding undisturbed land.


September 4, 2013   No Comments

Hydrostatic Pressure

This diagram illustrates the phenomenon known as hydrostatic pressure. When water builds up to a high degree against your foundation, the pressure reaches a point when it must be released. The easiest way for this to happen is in the form of water entering your home through various intrusion points in the foundation.


May 19, 2013   No Comments

Other Types of Leaks

This diagram illustrates additional points of water intrusion (beyond the most common: cover joint). These include leaks from a sump pump, window well, mortar joint, foundation top, wall crack, tie rod, pipe issue, porous concrete, floor drain, and floor crack.


January 12, 2013   No Comments

The Most Common Leak

This diagram illustrates how water most commonly enters a basement through the wall and floor joint (this is called the cove joint, and it’s present in all cinder block foundations).


October 30, 2012   No Comments