I've seen houses ripped off slabs during a tornado. How do your storm shelters not blow away as well?

I’ve seen lots of news reports that show houses and other buildings being torn off of slab foundations during tornadoes. What keeps your storm shelters anchored to the slab? It seems like they would be sucked away also?

Houses lift off their slabs because they’re made of wood & brick and anchored every 4 feet or so. They are not designed to withstand 250 mph EF5 winds like a safe room. Tornado Alley Armor Safe Rooms are made of tempered steel and anchored every 10” around the entire perimeter.

The slabs always stay behind because they have enough mass and a low profile, and our safe room is engineered with enough anchors to provide hold down and shear resistance that is orders of magnitude greater than maximum F5 forces. There is a mountain of evidence online documenting the level of safety of above ground safe rooms, and verifying they are just as safe as anything below ground.

If a safe room is built by a National Storm Shelter Association Producer Member, all aspects of the design, construction, documentation, installation and quality control measures have been independently verified to meet or exceed FEMA, ICC-500 and NSSA design recommendations. Other associations or non-associated producers don’t offer that level of compliance verification.

Thanks for your question!