How to Build a Storm Shelter with Cinder Blocks

Storm shelters, which are constructed in accordance with FEMA criteria, offer almost complete protection against harm and fatalities during severe weather events, such as hurricanes, storms, and tornadoes. If your area experiences severe weather, you might want to construct a storm shelter or safe room for your family to ensure everyone’s safety in case of an emergency. It might be too late for you to leave your house and seek safety elsewhere during a severe weather event. Having a storm shelter at home can facilitate your hasty escape.

How To Build a Storm Shelter

Category	Details
Types of Storm Shelters	Basement shelters Freestanding above-ground structures Garage installations Interior room retrofits, such as closets or bathrooms Outdoor underground shelters
Size Recommendations	Tornado structures: minimum of 3 to 5 square feet per person Hurricane structures: 7 to 10 square feet per person
How To Build a Concrete Storm Shelter	Remove the existing concrete slab and excavate to the depth you need. Construct a wooden form for the shelter’s walls and ceiling. Install reinforcing steel throughout the structure. Pour small-aggregate concrete to fill the entire form. Use vibration techniques to eliminate air pockets in the concrete. Allow the concrete to cure for 24 hours before removing the forms. Install a certified storm shelter door and electrical components.
Foundation Considerations	Proper foundation is essential. If retrofitting, ensure the shelter’s foundation is separate from the home’s foundation. If building a new home, integrate the shelter’s foundation into the home’s design.
Reinforcement and Materials	Concrete walls and roofing: 6 to 8 inches thick Extensive steel reinforcement Specially designed and tested doors and hardware Ventilation systems to maintain air supply
Outdoor Storm Shelter Options	Above-Ground Shelters Can double as storage space when not in use Little risk of flooding or trapped water Easy access for those with mobility issues Simpler installation process Underground Shelters Use earth’s natural shielding properties Can be challenging to access quickly May require a pump system to remove water More complex installation process Potential for flooding in high water table areas
Meeting Building Standards and Regulations	FEMA P-320 guidelines for residential safe rooms ICC 500 (International Code Council Standard for Storm Shelters) Local building codes and zoning regulations

Steps to Build a Storm Shelter with Cinder Blocks

Item	Description
TOOLS	A collection of necessary tools for construction including:
Level	Used to ensure surfaces are even and straight.
Shovel	For digging and moving soil.
Excavator	Heavy machinery for digging large holes.
Masonry trowel	Used to spread and shape mortar.
Measuring tape	For measuring distances accurately.
SUPPLIES	Essential materials required for construction including:
Cellar door	A secure entry point for the shelter.
Cinder blocks	Main building material for the walls of the shelter.
Cement	Used in mixing for the foundation and wall construction.
Rebar	Steel reinforcements for added strength.
Reinforcing mesh (optional)	Additional reinforcing material for walls.
STEPS TO CONSTRUCT	Process steps in building the storm shelter:
Get Permits	Research local codes and obtain necessary permits.
Dig the Hole	Excavate a hole for the shelter, adjusting dimensions for stability.
Build the Foundation	Create a solid base with concrete footings and reinforced steel.
Install Door Frame and Sturdy Door	Construct and install a secure entrance.
Lay Cinder Block Walls	Build walls using cinder blocks with mortar.
Create the Shelter’s Ventilation System	Ensure airflow to avoid harmful gas accumulation.
Build the Shelter’s Roof	Construct a protective roof using durable materials.
Install Support Beams	Add beams for roof support and stability.
Create a Moisture Barrier	Apply waterproofing to protect against water damage.
EXTRA CONSIDERATIONS	Important tips and considerations for the project:
Expert Skill Level	Recognize that this project is not simple and requires expert skills.
Time Required	Estimated completion time is around three weeks.
Cost	Expect total costs to be $1,000 or more.

Conclusion

In this guide, you learned about how to build a storm shelter with cinder blocks, how to build a storm shelter, the construction cost, and other interesting concepts. For more informative guides, stay connected to Buildersviller.

How to Build a Storm Shelter with Cinder Blocks