3.2.9 Describe foundation drainage systems
- Foundation Handbook: Recommended Design and Construction Details
- Water management (CHBA 9.1.1)
- Surface Drainage
- Free-draining backfill
- Graded drainage pipe system
- Means to convey water away from the foundation drainage
- Waterproof coatings prevent water penetrating foundation walls, e.g. bitumen/felt layers
- A French drain is a trench filled with gravel or rock or containing a perforated pipe that redirects water away from an area.
- Board systems add additional protection to direct water to the French drain system.
- Dimple board
- Capillary break (see illustration)