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P-1114.2 Green Roof design. Green roof designs shall comply with Section 1101.7. Support for the weight of the green roof system shall be accounted for in the building structural design and prepared by a licensed design professional for all new building construction and alterations or retrofits to existing structures.
P-1114.2.1 Green roof rainfall rates. The green roof drainage system shall be designed based on the reduced rainfall rate in accordance with Section 1106.1 only where approved through the Philadelphia Water Department and satisfy the design, installation and maintenance requirements set forth by the Philadelphia Water Department stormwater management regulations and, if applicable, the City of Philadelphia Zoning Code.