If the roof of a Class 1 or Class 2 magazine can be shot into from higher ground, it shall be protected by a sand tray or 4 inches of hardwood located at the line of eaves and covering the entire area except that necessary for ventilation. Sand in the sand tray shall be maintained at a depth of not less than 4 inches, or equivalent construction approved by the State Fire Marshal.
Conn. Agencies Regs. § 29-349-162