Section 27-502. Projecting signs

(a) Location.  Projecting signs, other than
  temporary  signs,  shall not be constructed on those streets and avenues
  listed in reference standard RS 7-2, and shall  not  be  constructed  to
  project beyond the street line except as permitted in subchapter four of
  this chapter.
    (b) Limitations. Projecting signs whose width when measured at a plane
  parallel  to  the building wall, does not exceed two feet may extend not
  more than five feet above the main roof level of the building  to  which
  they  are  attached;  except that for buildings thirty-five feet high or
  less, such projecting signs may be erected to a maximum height of  forty
  feet  above  grade  but in no case to a height of more than fifteen feet
  above the main roof level.
    (c)  Materials.  All  projecting  signs  shall   be   constructed   of
  noncombustible  materials  except  as  permitted  in sections 27-506 and
  27-507 of this article.
    (d) Supports. Projecting signs shall be constructed and  supported  to
  resist  loads acting in any direction on the sign in accordance with the
  provisions of subchapter nine of this chapter. Attachment  shall  be  by
  means  of  metal  anchors, bolts, supports, chains, wire ropes, rods, or
  other similar devices. No staples or nails shall be used to  secure  any
  projecting  sign  to any building. Turnbuckles or other equivalent means
  of adjustment shall be  placed  in  all  chains,  wire  ropes,  or  rods
  supporting or bracing projecting signs. All chains, wire ropes, or rods,
  and  their  attachments,  shall  be galvanized or of corrosion-resistant
  material, and no such supports shall be attached to an unbraced  parapet
  wall.