First, this is not a knock on concrete because we use concrete as our backfiller for our Safehand Shelters Steel Storm Shelters along with our added steel rebar anchors to make your Steel Storm Shelter, slab or concrete all one piece. So concrete is incredibly strong in most cases. Of course it is used in every aspect our lives, so of course by nature we think its good for everything. However, using the product as a underground storm shelter is not what we professionally recommend.  Here is our best professional answer we can provide you for you to educate yourself and do more research so you are able to make the best decision for you and your family. The first thing about underground concrete storm shelters failing is do to shifting earth soil, changing temperatures and earthquakes!

As temperatures fluctuate in the earth, the ground will swell and contract.  This puts a substantial amount of pressured force on any buried structure. If you didn't know concrete is a rigid product by nature, so when the earth shifts or when we have earthquakes the results is cracking.  Once your underground concrete is cracked, new problems quickly follows and these problems don't go away they continue to exist.  One of those problems we often see is that Moisture or water will start to seep into the shelter from the surrounding earth. Mold is often the next thing that starts to follow. Moisture and mold are two things shelter owner should not want as a problem. Our Shelter Maintenance Service (SMS) 

What you should know is that concrete storm shelters used today are basically modified septic tanks.  If you notice these units are installed 2 pieces (top and bottom) that are connected by metal brackets. That in itself is also a problem that is clearly visible because these units are fabricated with a large seam that wraps around the entire shelter when they put the lid on.  Why is this an issue? This is another point of potential failure in these shelters due moisture.

We can all agree that concrete has many strengths. However, recommend our Safehand Shelters steel fabrication shelters to ensure the shelter is never affected by leaks, moisture, cracking or mold. Our Shelter Maintenance Service (SMS) is annual service you can purchase additionally for us to maintain your Safehand Shelters Steel Shelters (Learn More). Steel does expand and contract with the changing temperatures but with know cracks ensuring that it will last for generations to come.