Atlas Safe Rooms have been tested at Texas Tech for EF-5 simulated projectile impact testing. Atlas has had multiple 3rd party engineer reviews to reinforce that our shelters meet and exceed required storm shelter codes and standards. Each Atlas Safe Room comes with an American Tornado Shelter Association (ATSA) seal of approval.
Overturning stability depends on the thickness (mass) of the concrete slab plus the distance the slab extends beyond the footprint of the shelter. Atlas engineering reveals that an 8” slab that extends 2’ beyond the shelter on each side is sufficient. Existing concrete slabs vary in thickness, steel reinforcement and build methods and therefore Atlas Safe Rooms certifies the structural integrity of the shelter alone.