Any person, official, board, commission, council, agency or authority desiring an exemption from the requirements of this section with regard to any public building or structure may apply to the State Building Commission for an exemption from the requirements of the provisions of this section and the State Building Commission may grant such exemption if concurred in by the Alabama Director of Emergency Management and the Governor. In making a determination on the question of whether the requirement of radioactive fallout protection is economically impracticable, the State Building Commission shall grant an exemption in any case where application is made therefor if the cost of inclusion of radioactive fallout protection would create an additional net cost in the cost of such public building or structure in excess of the percentages of the estimated costs of such public building or structure as follows:
Ala. Code § 39-6-1 (1975)