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When the cleaning of roof gutters, repairing of roofs, or the conducting of similar work, in places projecting over, or facing public streets, roads or places, is to be undertaken, the parties concerned shall post up such notice, or lights, as will sufficiently warn those passing of the inconvenience or danger of the place. Under no circumstances shall dry mortar, or any material of a similar nature, be thrown across public streets, roads or places.