Tex. Health & Safety Code § 791.023
(b) Each facility subject to this section and Section 791.002 that has a lot area greater than 8,000 square feet shall provide, in addition to the fire escape required by Section 791.002, one additional fire escape for:
Acts 1989, 71st Leg., ch. 678, Sec. 1, eff. Sept. 1, 1989.