Whenever it shall come to the knowledge of the Board of Health that the sanitary condition of any building or premises is injurious to the health of the occupants or of the public, the Board of Health shall make a thorough examination of the building or premises and shall direct and instruct the owner or person in charge thereof as to the remedy for the condition, and if the condition is not remedied within a reasonable time, the Board of Health shall cause the building or premises to be put in good sanitary condition at the cost of the person responsible for or causing the unhealthy or dangerous condition.
('69 Code, § 13-25)