Walls should be constructed to resist vandalism and facilitate ease of maintenance. Exterior and interior walls within inmate housing and activity areas shall be constructed as follows:
  (1) Exterior walls:
    (A) a minimum 8" concrete block vertically reinforced by #3 bars 8" on center and all cells filled with 2500 psi grout, or
    (B) a minimum of 4" thick concrete plank reinforced with #4 bars 8" on center each way, or
    (C) a minimum 3/16" thick steel plate.
  (2) Interior walls:
    (A) a minimum 6" concrete block vertically reinforced by #3 bars 8" on center and all cells filled with 2500 psi grout, or
    (B) a minimum 4" thick concrete plank reinforced with #4 bars 8" on center each way, or
    (C) a minimum 3/16" thick steel plate. Innovative design concepts are encouraged and comparable materials and methods approved by the Commission may be utilized for exterior and interior wall construction.

Source Note: The provisions of this §259.240 adopted to be effective December 12, 1994, 19 TexReg 9376; amended to be effective February 4, 1999, 24 TexReg 591