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1510.5 Towers, Spires, Minarets, Domes and Cupolas
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Towers, spires, minarets, domes, cupolas, and similar features shall be of a type of construction having fire-resistance ratings not less than required for the building on top of which such feature is built. Such features greater than 85 feet (25 908 mm) in height above grade plane as measured to the highest point on such feature, and either greater than 200 square feet (18.6 m2) in horizontal area or used for any purpose other than a belfry or an architectural embellishment, shall be constructed of and supported on Type I or IIA construction.
Features greater than 60 feet (18 288 mm) in height above the highest point at which such feature contacts the roof as measured to the highest point on such feature, or that exceeds 200 square feet (18.6 m2) in area at any horizontal section, or which is intended to be used for any purpose other than a belfry or architectural embellishment, or is located on the top of a building greater than 50 feet (1524 mm) in building height shall be constructed of and supported by noncombustible materials and shall be separated from the building below by construction having a fire-resistance rating of not less than 1.5 hours with openings protected in accordance with Section 711. Such features located on the top of a building greater than 50 feet (15 240 mm) in building height shall be supported by noncombustible construction.
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