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// CODE SNIPPET

Section 1502 Roof Drainage

Building Code 2021 of Illinois > 15 Roof Assemblies and Rooftop Structures > 1502 Roof Drainage
JUMP TO FULL CODE CHAPTER

[P] 1502.1 General

Design and installation of roof drainage systems shall comply with this section, Section 1611 of this code and Chapter 11 of the International Plumbing Code.

[P] 1502.2 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 above the roof in such a manner that water will be entrapped if the primary drains allow buildup for any reason. The installation and sizing of secondary emergency overflow drains, leaders and conductors shall comply with Section 1611 of this code and Chapter 11 of the International Plumbing Code.

1502.3 Scuppers

Where scuppers are used for secondary (emergency overflow) roof drainage, the quantity, size, location and inlet elevation of the scuppers shall be sized to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by Section 1611.1. 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 locating and sizing scuppers.

1502.4 Gutters

Gutters and leaders placed on the outside of buildings, other than Group R-3, private garages and buildings of Type V construction, shall be of noncombustible material or not less than Schedule 40 plastic pipe.

Related Code Sections


Section 1502 Roof Assemblies and Rooftop Structures, Roof Drainage
Design and installation of roof drainage systems shall comply with Section 1502 of this code and Sections 1106 and 1108, as applicable ...
Building Code 2018 of Illinois > 15 Roof Assemblies and Rooftop Structures > 1502 Roof Drainage
Section 1502 Roof Assemblies and Rooftop Structures, Roof Drainage
Design and installation of roof drainage systems shall comply with this section, Section 1611 of this code and Chapter 11 ...
Building Code 2021 of Illinois > 15 Roof Assemblies and Rooftop Structures > 1502 Roof Drainage
1502.3 Roof Assemblies and Rooftop Structures, Scuppers
Where scuppers are used for secondary (emergency overflow) roof drainage, the quantity, size, location and inlet elevation of the scuppers shall ...
Building Code 2018 of Illinois > 15 Roof Assemblies and Rooftop Structures > 1502 Roof Drainage > 1502.3 Scuppers
1502.4 Roof Assemblies and Rooftop Structures, Gutters
Gutters and leaders placed on the outside of buildings, other than Group R-3, private garages and buildings of Type V construction, shall ...
Building Code 2021 of Illinois > 15 Roof Assemblies and Rooftop Structures > 1502 Roof Drainage > 1502.4 Gutters
1502.4 Roof Assemblies and Rooftop Structures, Gutters
Gutters and leaders placed on the outside of buildings, other than Group R-3, private garages and buildings of Type V construction, shall ...
Building Code 2018 of Illinois > 15 Roof Assemblies and Rooftop Structures > 1502 Roof Drainage > 1502.4 Gutters
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