Aug 22, 2020 · CRC R903.4.1 Secondary (emergency overflow) drains or scuppers. Where roof drains are required, secondary emergency overflow roof drains or scuppers shall be provided …

Nov 2, 2009 · The old 2002 California Plumbing Code (2006 UPC) section 1101.11.2.1 stated that roof secondary drain / overflow scuppers needed to have "three times the size of the roof …

Oct 22, 2020 · At one time an overflow scupper was required to be 3 times the area of the primary drain. I size scuppers based on the scupper being clogged (with branches, leaves, & other …

May 4, 2022 · The structural sections don't take into account head height, which is used to determine the drain/ scupper flow rate. If, for example, the bottom of your overflow is at 2" …

Apr 6, 2015 · I know it's allowed in residential applications. Is there a scenario where a scupper would be allowable as the primary system of roof drainage? In this case it's a very low one …

Oct 16, 2009 · roof drain systems shall be sized in accordance with Section 1106 based on the rainfall rate for which the primary system is sized. Scuppers shall be sized to prevent the depth …

Nov 13, 2009 · Can a roof drain over a sidwalk? I am concerned that the roof drainage from the gutter and downspout will freeze on the sidwalk and cause a slip hazard. Is there a code …

Nov 27, 2019 · Here in California, our plumbing code 1101.12.2.1 1105.1 states: (9) Scupper openings shall be not less than 4 inches (102 mm) high and have a width equal to the …

Oct 16, 2009 · When a neighboring structure can transfer snow load onto another roof, do you treat that as a design responsibility, a maintenance issue, or something outside the scope of …

Nov 29, 2011 · For a tenant buildout for a restaurant we are constructing a roof dog-house over a rated shaft for HVAC and Exhaust ducts. The plan reviewer is requiring us to fire-rate the …