For several decades, the entire waterproofing industry installed ‘open system’ drains where a 1/4-1/2″ gap was left between the floor and the wall. The theory behind this was that if any water ran down the wall, it could get into the drain rather than end up on the floor. That sounds logical, but the problem is that by leaving the gap, moisture in the form of water vapor and RADON are able to escape and enter the home. Only in recent years has the waterproofing industry realized the shortcomings of an open system. In fact, most companies around today still have not adopted a ‘closed system’ policy, because it is easier to sell an ‘open system’ to most homeowners who are only looking for the cheapest and fastest way to solve their immediate problem. Only a customer who educates themselves to understand the larger picture can see that a ‘closed system’ is the only way to truly protect their home and family’s health in the long run.