When finishing your basement adding a layer of properly installed vapor barrier with your french drain system can add an extra layer of protection in the event of any unforeseen leaks.
In a heavy rain this townhouse basement has water leaking thru (across) an exterior wall. You can see the white lines of salt deposits from the water erosion. These types of leaks are a very common occurrence with both heavy clay and sandy soils around the various areas of Northern Virginia. Fortunately we can fix it!