Section 27-684. Footings

Inspections  of  subgrade of footings, piers and
  walls shall comply with the requirements of section  27-723  of  article
  thirteen of this subchapter.
    (a)  Wood  footings.  Wood  footings  may  be used only for wood frame
  structures. Wood footings shall be given  a  preservative  treatment  in
  accordance with reference standard RS 11-4.
    (b)  Pole  buildings.  Buildings  not  more than one story high may be
  supported on poles embedded in the ground. Wood poles shall  conform  to
  the  requirements  of  reference  standard  RS 11-5 and shall be given a
  preservative treatment in accordance with reference  standard  RS  11-4.
  Steel  poles  embedded in the soil shall be protected as required by the
  provisions of paragraph one of subdivision (c) of section 27-685 of this
  article.
    (c) Grillages. Grillage beams shall be provided with  proper  spacers,
  stiffners,  and  diaphragms,  or  the  space  between the beams shall be
  filled with concrete or grout. In addition, all steel grillages shall be
  fully protected against corrosion  by  encasement,  coating  with  metal
  protection  of  a  type  satisfactory  to  the  commissioner or by other
  approved device.
    (d) Design.
    (1) CONCRETE FOOTINGS. Concrete  footings  shall  be  proportioned  in
  accordance   with   the   provisions  of  reference  standard  RS  10-3.
  Reinforcement shall extend to within four inches of  the  edges  of  the
  footing.
    (2)  MASONRY  FOOTINGS.  Masonry used for the construction of footings
  shall be of solid units.
    a.  Reinforced  masonry  footings  shall  meet  the  requirements   of
  reference  standard  RS  10-2 and shall be proportioned similarly to the
  proportioning of reinforced concrete footings.
    b. Unreinforced masonry footings shall be of  such  dimension  that  a
  sloping  plane  extending  downward from the top of the footing where it
  intersects the pier of wall, to the bottom of the footing, and  measured
  at  the  angle  with  the  horizontal  that  is indicated below, will be
  contained entirely within the footing:
    Soil bearing capacity of three tons per square foot  or  less--  sixty
  degrees
    Soil  bearing capacity between three tons per square foot and six tons
  per square foot--seventy degrees
    Soil bearing capacity greater than six tons per square foot  shall  be
  investigated.
  The  compressive stress in the footing, based on the assumption that the
  vertical load is uniformly distributed over horizontal sections  bounded
  by  said planes, shall not exceed the values given in reference standard
  RS 10-1.