Introduction
Building your own underground storm shelter can provide a safe haven during severe weather events. This guide will walk you through the process of constructing a 10×6 ft shelter for under $2,000. Follow these steps to ensure a sturdy and effective shelter that meets your safety needs.
Site Selection
Choosing the right location is crucial for the success of your project. Here’s how to select the ideal spot:
- Location: Opt for a hillside near your home with natural drainage. This minimizes the risk of water accumulation and ensures easy access.
- Excavation: Dig a 20×20 ft hole, ensuring the bottom is 18 inches above valley level. This prevents water from seeping into the shelter.
- Water Diversion: Create a trench around the perimeter of the hole, wide enough for a shovel. This trench will divert water away from the structure.
Drainage System
Proper drainage is essential to prevent water from entering the shelter. Here’s how to set up a French drain:
- French Drain Installation: Dig a trench downhill from the shelter and install a 6-inch septic pipe. This pipe will channel water away from the shelter.
- Rock Layer: Cover the pipe with 8 inches of rock to enhance drainage. This layer acts as a filter, ensuring clean water flow.
Structure Assembly
The core of your shelter is the septic tank. Here’s how to assemble it:
- Septic Tank: Purchase a 1500-gallon concrete septic tank, which costs around $750. This tank forms the main body of the shelter.
- Reinforcement: Reinforce the tank with steel rebar to increase its strength. Drill vent holes at the bottom left and top right corners for ventilation.
- Sealing: Seal the seams of the tank with hydraulic cement and apply a Dam Tight coating to ensure watertight integrity.
Door Installation
The door is a critical component for safety and accessibility. Here’s how to install it:
- Doorway Cutting: Cut a doorway that is 1 inch larger than the tank opening. This extra space allows for a proper fit.
- Door Frame: Use 1/8-inch steel plates to create a 2-inch above-roof door frame. This frame provides structural support and security.
- Seal Application: Apply a rubber seal around the door frame to ensure a watertight closure. This prevents water and debris from entering the shelter.
Insulation & Backfilling
Insulation and proper backfilling are necessary for maintaining a comfortable and safe environment inside the shelter. Here’s how to do it:
- Insulation: Add pink foam insulation to the interior walls using Liquid Nails. This insulation provides thermal protection and reduces noise.
- Retaining Walls: Use 4×4 PT posts as retaining walls to hold back the soil. These walls prevent the shelter from collapsing due to soil pressure.
- Backfilling: Backfill the area with 83 cubic yards of dirt. Apply 4 inches of dirt on the back and 2 inches on the front to ensure stability.
Front Wall Reinforcement
The front wall is the most exposed part of the shelter and requires extra reinforcement. Here’s how to fortify it:
- Concrete Blocks: Install 2x2x4 ft concrete blocks, each weighing one ton. Stack three blocks high to create a 6-inch barrier.
- Additional Soil: Add 4 inches of dirt in front of the structure to further protect it from potential water damage.
Interior Finishes
The final touches make the shelter comfortable and functional. Here’s how to finish the interior:
- Flooring: Use industrial rubber floor mats to separate the dirt from the shelter floor. These mats provide a clean and slip-resistant surface.
- Acoustics & Headroom: Add thin insulation to the ceiling for acoustics and to ensure adequate head clearance.
- Ventilation: Install a ventilation system to maintain air quality inside the shelter. Consider options like a battery-powered fan or a passive ventilation system.
Conclusion
By following these steps, you can build a reliable underground storm shelter for under $2,000. This project requires careful planning and execution but provides a safe haven during severe weather events.