Section 27-647. Special glasses

For  types  of  glass  other than single
  annealed  sheet  and  plate  glass,  allowable  maximum  areas  may   be
  determined  by  multiplying  values  in  table  10-7  by the appropriate
  multiplying factor listed in table 10-8.
 
         TABLE 10-8  Multiplying Factors for Various Types of Glass
  ========================================================================
       Glass Type                                  Multiplying Factor
  ------------------------------------------------------------------------
  Full tempered .......................................   4.0
  Heat strengthened ...................................   2.0
  Factory-fabricated double glazing ...................   1.5*
  Laminated ...........................................   0.6
  Wired ...............................................   0.5
  Sandblasted or etched ...............................   0.4
  ========================================================================
  * For asymmetrical units base strength on thinner lite.