Roof Scupper: A Drainage System for Flat Roofs

A roof scupper is a drainage device installed on flat or low-slope roofs to manage water runoff. It provides a way for water to flow off the roof surface and into the external drainage system, preventing water accumulation that can cause leaks and structural damage.

Roof scuppers are typically installed during construction or retrofitting of a building. They are placed on the parapet wall or perimeter edge of the roof and connected to a downspout or leader pipe, which directs the water away from the building. Proper installation is crucial for efficient functioning and requires consideration of factors such as roof slope, rainfall intensity, and building codes.

Roof scuppers find extensive use in various commercial and residential applications, including buildings with flat or low-slope roofs, green roofs, and industrial buildings. Regular maintenance is essential to ensure proper functioning and prevent water accumulation and damage to the roof and building.

Overall, roof scuppers play a critical role in effective water management on flat or low-slope roofs and are an important component in building construction and maintenance.

Types of Roof Scuppers There are different types of roof scuppers available, including:

Metal scuppers: These are made of durable materials like copper or aluminum and are typically more expensive than plastic scuppers.
Plastic scuppers: These are made of PVC or ABS and are less expensive than metal scuppers. They are also more lightweight and easier to install.
Parapet scuppers: These are designed for buildings with parapet walls. They have a wider flange that extends over the parapet wall to prevent water from leaking behind the wall.

Codes (U.S.)

2018 International Building Code | SECTION 1502 ROOF DRAINAGE

• 1502.1 General
• 1502.3 Parapet wall roof drainage scupper and overflow scupper location
• 1502.4 Gutters

ASTM STANDARDS

• B101 Standard Specification for Lead-Coated Copper Sheet and Strip for Building Construction
• B32 Solder
• A924 Standard Specification for General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip Process