Section 27-434. Construction

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Heliports shall be permitted only on buildings
  classified  in  noncombustible  construction  group  I.   All   heliport
  construction  above  the  building  roof  shall  be  noncombustible.  No
  openings in the roof shall  be  permitted  in  the  landing  area.  Roof
  openings  outside  the  landing  area  shall be protected from flammable
  liquid spillage by four inch curbs and  shall  be  surrounded  by  metal
  railings  at  least  three  feet  complying  with  the  requirements  of
  subchapter nine of this chapter. The landing area shall be enclosed with
  a substantial metal fence or skirt.

                    
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