Basement Waterproofing - Double checking the thickness of the floor

Standard basement floors are 4 inches thick and standard concrete blocks are 8 inches high. Therefore, if you can see more than 4 inches of the bottom block there is a good chance that the floor is thinner. This means that adjustments have to be made to the drainage system design. If adjustments are not made there is a chance that the crew could damage the footer, and that is a huge "no-no" since the footer is the main structural support.