Install & Anchoring
Drainage in Underground Shelters
Also known as: shelter drainage, water management, perimeter drain
What good drainage looks like
- 6 inches of #57 stone surrounding the shelter shell
- 4-inch perforated PVC drain pipe at the footing, sloped to daylight or a sump
- Battery-backup sump pump in damp climates
- Slope the surrounding grade away from the entry hood