Section 408.30786. Sizing of secondary drains.

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Rule 786. Section 1108.3 of the code is amended to read as follows:

1108.3. Sizing of secondary drains. Secondary, or emergency, roof drain systems shall be sized in accordance with section 1106 based on the rainfall rate for which the primary system is sized in tables 1106.2 and 1106.3. Scuppers shall be sized to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by section 1101.7. Scuppers shall not have an opening dimension of less than 4 inches (102 mm). The flow through the primary system shall not be considered when sizing the secondary roof drain system.

History: 1998-2000 AACS; 2001 AACS; 2003 AACS; 2013 AACS.

                    
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