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What is the difference between a scupper and a roof drain?
What is a roof scupper?
How much water drains out of a scupper roof?
What is an overflow roof scupper?
Jun 26, 2024 · “Roof scupper” and “roof drain” are two frequently mixed up terms. While both manage water drainage, they have distinct characteristics. In this blog post, we will explain the differences between a roof scupper vs. roof drain, allowing you to make more informed roofing decisions for your home.
- What Is A Roof Scupper And Why Is It Important?
The big difference between a roof drain and a flat roof...
- What Is A Roof Scupper And Why Is It Important?
- Table of Contents
- Introduction
- What Is A Roof Scupper?
- Types of Roof Scuppers
- Roof Drainage Systems and Scuppers
- Roof Scupper Code Requirements
- Roof Scupper Tips
- Related Pages
- External Sources & References For Roof Scupper Information
We’re professional building envelope consultants – roof experts. Our clients include homeowners associations, corporate real estate asset managers, property managers, and facility directors. As a part of our job, we research and design roof drainage systems for new roof installations and roof replacement projects. We have to decide whether to use r...
The International Building Code defines a roof scupper as “an opening in a wall or parapet that allows water to drain from a roof”. Roof scuppers are occasionally referred to as “roof scupper drains” or just “scupper drains”, for obvious reasons. Scuppers do drain the roof, but it is incorrect to call them drains. “Roof drain” refers to a component...
Roof scuppers mainly come in two forms: the open scupper (a 3-sided scupper, open at the top, also called a “channel-type” scupper), or the through-wall scupper (basically a hole in the wall, usually rectangular). Occasionally, you’ll see a round roof scupper or a decorative scupperin some other shape.
Scuppers will play one of two roles in a roof system: they will either be a part of the primary roof drainage system, or they will be a part of the secondary (overflow) roof drainage system. A primary drainage systemwill simply be designed to remove water from the roof as quickly as possible. An overflow drainage systemwill be designed as a complet...
There are different code requirementsfor scuppers depending on which role they play. It’s important to note that the language regarding both primary and overflow scuppers in the most recent version of the International Building Codestates that: “the quantity, size, location and inlet elevation of the scuppers shall be chosen to prevent the depth of...
Scupper Maintenance
Sealant Deterioration: The sealant around the flange or faceplate on the exterior wall surface around a thru-wall scupper is a maintenance item. Sealant deteriorates over time. It’s important to check the condition of this sealant every year and replace it when it starts to go. This sealant plays a critical role in preventing roof leaks. It keeps water from getting between the metal scupper box and the wall masonry, and then backing up into the roof system and into the building.
Overflow Scuppers Can Tell You if the Drains are Clogged
Clogged Drains: Scuppers that serve as primary drainagecomponents typically direct water into a conductor box, downspout, or a gutter (you don’t normally want to see water running down the side of your building or shooting out into the air like a miniature waterfall). If interior roof drains are your primary drainage system, and the scuppers are your secondary drainage system, you dowant to see this water coming out of the scuppers, because it lets you know that your drains are clogged. This...
Ice Can Block Scuppers
Ice Build-Up: In colder climates, ice build-up at the scuppers in the winter can be a problem. Due to the fact that the scuppers are in the wall and not over the heated part of the building, they tend to be colder than the rest of the roof. Meltwater from snow on the roof may re-freeze at the scuppers and block water drainage, which could overload the roof. It’s important to have your scuppers checked and cleaned if this situation applies.
1. Building Codes: “1502.3 Scuppers” and “1502.2 Secondary (emergency overflow) drains or scuppers” from the 2018 International Building Code. Available on the UpCodeswebsite. 2. Building Codes: “R903.4.1 Secondary (Emergency Overflow) Drains or Scuppers” from the 2018 International Residential Code. Also note exception 2 under subsection 1 under “...
In short, a scupper is a detail that provides drainage to a roof system by allowing the water runoff from the roof to exit the roof through a metal edge, parapet wall or through the deck into a downspout or leader not run through the interior of the building.
Sep 29, 2021 · Roof Scupper vs. Roof Drain Roof scupper and roof drain both provide drainage to your roof system but the difference is that in the case of roof drain the water running off from your roof goes from the roof drain to the piping which runs into the interior of your house.
- A roof scupper can be defined as a drainage system that is mostly preferred from flat roofs. It is a pathway that allows the water to pass from one...
- Sheet metal is used to make a roof scupper as you can install by cutting a wide chunk through your roof. You should keep the scupper wide so that t...
- A roof scupper is too high when there is a great difference between the roof and the floor. In case of overflow scuppers, they must be positioned t...
- You can clean a roof scupper by cleaning all the dirt, debris, and weeds using a brush. You can also clean it using your hands by wearing gloves. Y...
- You can calculate the size of a roof scupper by multiplying the square ft. on the table by five. Then, divide it by the local rainfall rate. In mos...
- You can insert a lower roof scupper by using rubber material i.e., EPDM rubber by cutting its edges. The lower roof scuppers are known as primary s...
- You can seal a roof scupper at a wall with caulking. You can also do it by installing the rubber membrane over the areas on the wall where there ar...
- You can install a scupper on your flat roof by gathering the necessary tools, hiring an expert, and taking the measurement of your roof and the scu...
- It is estimated that about 7.79 gallons per minute can run through a roof scupper. The water flows frequently if there is no dust and debris stuck...
- More than seven gallons per minute of water drains out of a roof scupper. All the standing water on the roof drains out because the size of the scu...
Aug 17, 2023 · The International Building Code defines a roof scupper as “an opening in a wall or parapet that allows water to drain from a roof”. Roof scuppers are sometimes referred to as “roof scupper drains” or just “scupper drains”, for obvious reasons.
Jul 2, 2024 · What is difference between scupper and drain? The difference between a scupper and a drain is that a scupper allows water to escape through a hole or fixture on a sidewall, while a drain forces water into a confined space.
Jun 23, 2024 · The big difference between a roof drain and a flat roof scupper is how they carry water off of the roof. A roof scupper sends water down a metal edge, wall, or deck and into a downspout outside, while a roof drain carries water through a series of pipes within the building before letting it out. water through pipes inside the building before it ...
