Concrete Foundation Walls - Water Leakage
Problem: Water leakage through foundations - 1.
Cause: Inadequate site drainage.
Solutions: Ensure that rainwater is diverted away from the foundation.
- While a 2 percent slope away from foundation walls is commonly specified, a 10% slope away from the wall for the first 6 1/2 feet which is 8 inches, is recommended. This increase will ensure positive slope away from the building after the ground has settled around the foundation as shown in figure 21.
Figure 21 - Proper Site Drainage
- Locate downspouts around the perimeter of the building to ensure that rainwater is directed away from the building. Provide splash blocks to promote positive flows and to prevent erosion.
- On a sloping site, place the building at an angle to the slope to prevent the house form acting as a dam to natural run-off, or grade from the center of the house to the corners to direct water away from the building as shown in Figure 22a and 22b. Provide swales to promote drainage.