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R903.4.1 Overflow Drains and Scuppers
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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 and having a minimum opening height of 4 inches (102 mm) shall be installed in the adjacent parapet walls with the inlet flow located 2 inches (51 mm) above the low point of the roof served. The installation and sizing of overflow drains, leaders and conductors shall comply with the International Plumbing Code.
Related Code Sections
R903.4.1 Roof Assemblies, Overflow Drains and Scuppers
(51 mm) above the low point of the roof, or overflow scuppers having three times the size of the roof drains and having a minimum opening height of 4 ...
Residential Code 2009 of Tennessee > 9 Roof Assemblies > R903 Weather Protection > R903.4 Roof Drainage > R903.4.1 Overflow Drains and Scuppers
R903.4.1 Roof Assemblies, Secondary (Emergency Overflow) Drains or Scuppers
Where roof drains are required, secondary emergency overflow roof drains or scuppers shall be provided where the roof perimeter construction extends ...
Residential Code 2018 of Tennessee > 9 Roof Assemblies > R903 Weather Protection > R903.4 Roof Drainage > R903.4.1 Secondary (Emergency Overflow) Drains or Scuppers
1503.4.1 Roof Assemblies and Rooftop Structures, Secondary (Emergency Overflow) Drains or Scuppers
Where roof drains are required, secondary (emergency overflow) roof drains or scuppers shall be provided where the roof perimeter construction ...
Building Code 2012 of Tennessee > 15 Roof Assemblies and Rooftop Structures > 1503 Weather Protection > 1503.4 Roof Drainage > 1503.4.1 Secondary (Emergency Overflow) Drains or Scuppers
1108.1 Storm Drainage, Secondary (Emergency Overflow) Drains or Scuppers
Where roof drains are required, secondary (emergency overflow) roof drains or scuppers shall be provided where the roof perimeter construction ...
Plumbing Code 2012 of Tennessee > 11 Storm Drainage > 1108 Secondary (Emergency) Roof Drains > 1108.1 Secondary (Emergency Overflow) Drains or Scuppers
R908.1 Roof Assemblies, General
an existing roof covering shall not require the secondary (emergency overflow) drains or scuppers of Section R903.4.1 to be added to an existing roof ...