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Title: Section 1506  •  Size: 3957

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SECTION 1506 - ROOF DRAINAGE

1506.1 General. Unless designed for water accumulation in accordance with Section 1605.6 and approved by the building official, roof systems shall be sloped a minimum of 1/4 unit vertical in12 units horizontal (2% slope) for drainage.

1506.2 Roof Drains. Unless roofs are sloped to drain over roof edges, roof drains shall be installed at each low point of the roof.

Roof drains shall be sized and discharged in accordance with the Plumbing Code.

1506.3 Overflow Drains and Scuppers. Where roof drains are required, overflow drains having the same size as the roof drains shall be installed with the inlet flow line located 2 inches (51 mm) above the low point of the roof, or overflow scuppers having three times the size of the roof drains may be installed in adjacent parapet walls with the inlet flow line located 2 inches (51 mm) above the low point of the adjacent roof and having a minimum opening height of 4 inches (102 mm).

Overflow drains shall be connected to drain lines independent from the roof drain lines.

1506.4 Concealed Piping. Roof drains and overflow drains, when concealed within the construction of the building, shall be installed in accordance with the Plumbing Code.

1506.5 Over Public Property. Roof drainage water from a building shall not be permitted to flow over public property.

EXCEPTION: Group R, Division 3 and Group U Occupancies.

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