(1)
Roof surfaces that supply rainwater to a non- potable rainwater harvesting system shall be inaccessible to vehicular and pedestrian traffic. (See Note A-7.7.2.3.(1))
(2)
Roofing components and conveyance systems in contact with rainwater that is supplied to a non- potable rainwater harvesting system shall be constructed of materials that will not introduce substances into the rainwater that could adversely affect its intended end use. (See Note A-7.7.2.3.(2))