R.C.S.A. § 29-349-298
Floor construction
Cite as Conn. Agencies Regs. § 29-349-298
All flooring in storage and handling areas shall be of noncombustible material or protected against impregnation by ammonium nitrate and shall be without open drains, traps, tunnels, pits, or pockets into which any molten ammonium nitrate could flow and be confined in the event of fire.