September 20th, 2014 8:45 PM by Dan Howard
The contractor jack hammers up the floor. He then drills holes in the walls to collect the water running through the foundation walls into a four inch pipe with holes. There is some gravel poured around the pipe. The pipe is then connected to a covered plastic basin with a pump. The pump then sends the water outside of the house through a plastic pipe. The top concrete is then replaced. The customer then writes a very big check and cleans up concrete dust for the next month.
When you leave an opening in the floor to allow water to go down, the gases, mold and radon can come up from those openings a house acts like a chimney pulling air from low areas into upper areas. That is how radon and other gases that are under a basement floor get into the living area of homes.
In most systems of these systems, there is a plastic corrugated material installed between the concrete floor and block wall. This is installed to allow water to run into the drain. This is referred to as "egg crate." There are also systems with other materials and shapes that are similarly open.