Excavate to a depth of fifty two inches (52”) with a length of one hundred eleven inches (111”) and a width of eighty seven inches (87”). This allows for a six inch (6”) base of gravel and a three inch (3”) exposure of the base above ground.

In poorly draining soil, excavate an additional drainage pit (see illustration) and fill with free-draining rock. Compact soil after setting base.

We also recommend installing drain tile around the base of the storm shelter and running it to daylight to ensure proper drainage.

Place butyl seal around base lip (see inset). Set lid on base being careful not to dislodge the butyl seal.

Bolt shelter with straps provided. Slope soil away from shelter.

Click to enlarge image.