Section 11-8-3 - Foundation(a)Structure-supported vaults. The supporting structure shall be of adequate strength to carry the entire load of the vault and its contents. There shall be no combustible material in any portion of the supporting members of the structure. Structural members of the building which support the vault shall have all steelwork protected by at least four inches of fireproofing concrete.(b)Ground-supported vaults. Foundations for ground-supported vaults shall be reinforced concrete adequate for the entire load of the vault structure and contents. Supporting structural members shall have all steelwork protected by at least four inches of fireproofing concrete.Conn. Agencies Regs. § 11-8-3