When anchoring a storm shelter, it’s crucial to ensure that the concrete slab meets specific requirements to guarantee the safety and stability of the shelter. Below are the essential requirements for the concrete slab:
1. Concrete Strength:
- The concrete should have a test strength of 3000PSI or greater. This meets the recommendations set by both FEMA (Federal Emergency Management Agency) and NSSA (National Storm Shelter Association).
2. Slab Thickness:
- The slab must be a bare minimum of 4 inches thick.
- For a stand-alone pad, a thickness of 6 inches is recommended.
3. Reinforcement:
- The slab should be reinforced with one of the following:
- Rebar
- 6×6 wire mesh
- Post-tension cables
It’s essential to embed the chosen reinforcement in the slab during the pour.
4. Pillars or Foundation Depth:
- If you’re using a continuous foundation around the perimeter, it should extend 8 inches down and be 8 inches wide.
- If you’re using pillars at intervals around the slab, they should extend 24 inches down.
5. Slab Size:
- The size of the slab should be at least 12 inches larger on each side than the footprint of the shelter. This ensures adequate space for anchoring and stability.
Note on Installation by Storm Shelters of Iowa:
Storm Shelters of Iowa specializes in the installation of storm shelters. However, it’s essential to note that:
- The company does not pour the concrete for their storm shelters.
- The concrete slab must already be in place before the installation process begins.
- If you are in need of a concrete slab, Storm Shelters of Iowa can recommend a concrete installer
Please ensure that your concrete slab meets the above requirements before scheduling an installation with Storm Shelters of Iowa.
By adhering to these requirements, you can ensure the safety and longevity of your storm shelter, providing peace of mind for you and your loved ones during severe weather events.