Lone Star Safe Rooms use a Simpson Strong-Tie Wedge-All anchoring system to secure the safe room during an F5 tornado. Each safe room is bolted down to your concrete slab by drilling 5/8” x 3 ½” holes and inserting specialty designed anchoring bolts at the appropriate locations around the perimeter of the safe room to ensure the safe room stays in place as the rest of the house is torn away from the slab.