§ 60. Supervision of plastering by building department. The building department of every city of the first class shall have jurisdiction over all plastering except where it conflicts with the duties of any other department or conflicts with any law conferring on any other department supervision of any portion of plastering. For such purpose there shall be appointed in each building department in a city of the first class by the head thereof a sufficient number of inspectors to perform such work as is necessary in the enforcement of this article who, in addition to such qualifications as may be required by the civil service law, shall be competent plasterers of at least ten years' practical experience.