Nuclear Fallout Shelter Guide: Best Protection Strategies
Nuclear Fallout Shelter Basics
Not all shelters are created equal. The effectiveness of a shelter is measured by its Protection Factor (PF) — how much it reduces radiation exposure.
Protection Factor by Structure
| Shelter Type | Protection Factor | Radiation Reduction |
|---|---|---|
| Open air | 1 | None |
| Wooden house | 2-3 | 50-67% |
| Brick house (center) | 10-20 | 90-95% |
| Basement | 10-100 | 90-99% |
| Concrete building (center) | 100-200 | 99%+ |
| Underground parking | 200+ | 99.5%+ |
| Purpose-built shelter | 1000+ | 99.9%+ |
Key Principles
1. Mass Between You and Fallout
More mass = more protection. Concrete, earth, and water are the best shielding materials.
2. Distance from Contamination
Move away from outer walls, roofs, and the ground floor. The center of a multi-story building is ideal.
3. Time in Shelter
The longer you shelter, the more radiation decays. Aim for 24-72 hours minimum.
Improvised Shelter Tips
If no purpose-built shelter is available: