Section 27-336. Porticos, porches, etc

Porticos,  entranceways,  storm
  enclosures, bay windows, oriel windows, porches, or  similar  appendages
  may  be  constructed of combustible materials or assemblies on buildings
  of construction class II-E to an unlimited extent, and on  buildings  of
  construction  classes  II-A,  II-B,  II-C,  and  II-D  under  all of the
  following conditions:
    (a) The building is classified in occupancy group J-2 or J-3.
    (b) The building is not more than three stories or forty feet high.
    (c) The appendage has an exterior separation on all exposed  sides  of
  at  least  fifteen  feet,  measured  from  the  outermost surface of the
  appendage.
    (d) The appendage is so constructed that its  removal  or  destruction
  will  not reduce the structural stability or fire resistive integrity of
  the building.
    (e) The vertical surface area  of  the  combustible  portions  of  the
  appendage,  including any exterior trim, is not more than ten percent of
  the total wall area (windows excluded) of the building.
    (f) The appendage has  a  superficial  roof  area  not  exceeding  one
  hundred  fifty  square  feet  and is included in the area limitations of
  table 4-1 and 4-2 for the entire building.
    (g) The appendage is not higher than the sills  of  the  second  story
  windows.
    (h) The roof of the appendage has a class A roof covering.
    (i) The soffit or ceiling covering the combustible roof framing of the
  appendage has a one hour fire-resistance rating.
    (j) The requirements of subdivisions (h) and (i) of this section shall
  not  apply  in  the  case  of  roofs  or awnings over patios or entrance
  platforms where the area of vertical exposure of the patios or platforms
  to the outdoors is equal to at least that of the patio or platform area.
  Plastic  shall  be  slow  burning;  canvas  or  other  fabric  shall  be
  noncombustible  or  flameproofed  in  accordance  with the provisions of
  title fifteen of the administrative code.