B-1.1, r. 2 - Construction Code

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8.113. The installation of the following is prohibited:
(1)  aboveground outdoor piping on walls unless the walls are of non-combustible construction;
(2)  outdoor piping above windows;
(3)  outdoor piping above roofs, except roofs that are non-combustible and impermeable to petroleum products with provision for the collection of spillage to prevent a fire; and
(4)  piping containing petroleum products in service tunnels used for pedestrian traffic other than tunnels reserved for maintenance personnel.
O.C. 220-2007, s. 1.