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Decks and balconies greater than 6 feet (1.8 m) above grade, greater than 4 feet (1.2 m) deep, and with an area greater than 40 square feet (3.72 m2) attached to new Group R-1 and R-2 occupancy buildings protected in accordance with Section 903.3.1.2.that are three or more stories in height and with 30 or more units shall be protected with sprinklers under the balcony or deck framing and under attic eaves when both of the following two conditions exist:
  1. The building has an unsprinklered attic; and
  2. The building has combustible siding.

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