Stair tread pan design with bolt-in pre-cast concrete/other material tread capability

Abstract

A stair tread pan includes a plurality of stair risers, each of the plurality of stair risers comprising a uniform depth and width, whereby the stair tread pan consistently satisfies code requirements. The stair tread pan further comprising predetermined assembly tolerances are less than approximately ½ inch for drainage of the stair tread pan in an exterior use. The stair tread pan comprises at least one tread nosing formed into the stair tread pan for yielding a uniform for reliable and durable tread nosing. The stair tread pan further comprising a poor stop at a top end of the stair tread pan for receiving poured concrete, thereby illuminating the need for tea-bars or other concrete containing structures for forming a top landing on the stair tread pan. The the stair tread maybe read a leap replaced without disturbing the structured integrity outside stair tread pan in a building environment.

We claim: 
     
         1 . A stair tread pan, comprising:
 a plurality of stair risers, each of said plurality of stair risers comprising a uniform depth and width, whereby said stair tread pan consistently satisfies code requirements;   said stair tread pan further comprising predetermined assembly tolerances are less than approximately ½ inch for drainage of said stair tread pan in an exterior use; and   wherein said stair tread pan comprises at least one tread nosing formed into said stair tread pan for yielding a uniform for reliable and durable tread nosing;   said stair tread pan further comprising a poor stop at a top end of said stair tread pan for receiving poured concrete, thereby illuminating the need for tea-bars or other concrete containing structures for forming a top landing on said stair tread pan;   and further whereby he said stair tread maybe read a leap replaced without disturbing the structured integrity outside stair tread pan in a building environment.   
     
     
         2 . The stair tread pan of  claim 1 , wherein said predetermined assembly tolerances are sufficiently precise for production style assembly of said stair tread pan. 
     
     
         3 . The stair tread pan of  claim 1 , wherein said predetermined assembly tolerances are sufficiently small for providing additional support for pre-cast treads and material treads. 
     
     
         4 . The stair tread pan of  claim 1 , wherein said predetermined assembly tolerances are sufficiently small for permitting a lighter tread for satisfying a plurality of predetermined load requirements.