2006 New York Code - Thickness Of Glass.

 
    §  27-646  Thickness  of  glass.  Thicknesses of glass panels shall be
  chosen either on the basis of  statistical  probability  of  breakage  (
  subdivision  (a)  of this section) or on the basis of table 10-7, at the
  designer's option.  (a)  Statistical  probability.  Thickness  of  glass
  panels  shall  be chosen so that the statistical probability of breakage
  when the glass is initially subjected to the design wind load  specified
  in  table  RS  9-5-1 does not exceed the values indicated in table 10-6.
  Probability or load factors used for design shall be  derived  by  test.
  The  sufficiency  and  validity  of  such  test data shall be subject to
  approval by the commissioner.
    (b)  Alternate  requirements.  Alternative  to  the  requirements   of
  paragraph  (a)  above,  the thickness of glass panels may be chosen from
  table 10-7.   For glass with  assured  minimum  thickness  greater  than
  required by reference standard RS 10-68, the maximum areas in table 10-7
  may be increased in proportion to the assured minimum thickness.
 
            TABLE 10-6  Probability of Breakage for Glass Panels
                 (Based on Coefficient of Variation of 25%)
  ========================================================================
     Elevation Above Grade
     of Mid-Point of Glass                Area of Panel--Sq. Ft.
  ------------------------------------------------------------------------
  -Ft......................   0-60      60-80     80-100   100-120   120+
  0-50.....................   1.0%      1.0%      1.0%     1.0%      1.0%
  50 or more...............   1.0%      0.8%      0.6%     0.4%      0.2%
  ========================================================================
 
                 TABLE 10-7  Maximum Area of Glass--Sq. Ft.
  ========================================================================
                                        Elevation Above Grade of Mid-
                                            Point of Glass--Ft.
  Nominal Thickness
  of Glass--Inches                   0-50      50-300    300-600     600+
  ------------------------------------------------------------------------
  Sheet Glass
    Single strength.............       9         9           8         7
    Double strength.............      13        13          11        10
     3/16"......................      25        25          21        19
     7/32"......................      32        32          27        24
  Plate and Float Glass
     13/64".....................      25        25          21        19
     1/4".......................      37        37          32        28
     5/16"......................      54        54          46        40
     3/8".......................      78        74          63        58
     1/2".......................     114       100          86        75
     5/8".......................     152       120         103        90
     3/4".......................     210       137         118       103
     7/8".......................     241       158         135       118
     1".........................     312       204         175       153
  ========================================================================