Exterior drainage systems are most often based on 4″ water from around the outside of the footer and drain it to another nearby location. Ideally these locations are substantially lower than the footer they are trying to drain. If there is not adequate pitch it is possible for the drains to actually add water to the foundation rather than drain it from the foundation. Without proper discharge the water will not be able to drain in time causing back up at the footer. Another problem is that this back and forth movement of water introduces mud, silt and stone into the drain pipes, clogging them at a much faster rate.
Below is an images of exterior waterproofing being installed.
- Excavate the foundation to the footer
- Clean foundation wall and footer
- Apply foundation waterproof membrane
- Install Drain tile with proper pitch
- Cover drain tile with washed stone
- Install window well drains ( If Needed )
- Back fill foundation
- New window well and covers ( If Needed )