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Where an addition is added to an existing Group E occupancy located in an area where the shelter design wind speed for tornados is 250 mph (402.3 km/h) in accordance with Figure 304.2(1) of ICC 500 and the occupant load in the addition is 50 or more, the addition shall have a storm shelter constructed in accordance with ICC 500.
Exceptions:
  1. Group E day care facilities.
  2. Group E occupancies accessory to places of religious worship.
  3. Additions meeting the requirements for shelter design in ICC 500.
303.2.1 Required Occupant Capacity
The required occupant capacity of the storm shelter shall include all buildings on the site, and shall be the total occupant load of the classrooms, vocational rooms and offices in the Group E occupancy.
Exceptions:
  1. Where an addition is being added on an existing Group E site, and where the addition is not of sufficient size to accommodate the required occupant capacity of the storm shelter for all of the buildings on-site, the storm shelter shall at a minimum accommodate the required capacity for the addition.
  2. Where approved by the code official, the required occupant capacity of the shelter shall be permitted to be reduced by the occupant capacity of any existing storm shelters on the site.
303.2.2 Occupancy Classification
The occupancy classification for storm shelters shall be determined in accordance with Section 423.3 of the International Building Code.

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1106.1 Additions, Addition to a Group E Occupancy
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Section 1106 Additions, Storm Shelters
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