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317.2 Rooftop Garden or Landscaped Roof Size
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Rooftop garden or landscaped roof areas shall not exceed 15,625 square feet (1450 m2) in size for any single area with a maximum dimension of 125 feet (39 m) in length or width. A minimum 6-foot-wide (1.8 m) clearance consisting of a Class A-rated roof system complying with ASTM E108 or UL 790 shall be provided between adjacent rooftop gardens or landscaped roof areas.