# You asked: What is roof scupper?

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Description: Scuppers are used to provide an outlet through parapet walls or gravel stops on flat and built-up roofs to allow drainage of excess water. They can be used in conjunction with gutters and downspouts to divert the flow to the desired location.

## What is the function of a scupper?

A scupper is an opening in the side walls of a vessel or an open-air structure, which allows water to drain instead of pooling within the bulwark or gunwales of a vessel, or within the curbing or walls of a building.

## Where do you place scuppers?

What is a scupper? Scuppers are drain openings placed in areas on the side of a roof for water drainage. A scupper can be placed through a side wall, or a parapet wall, or could be on a low area on the edge of a roof.

## What is a metal scupper?

A roof scupper provides drainage of a flat roof 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.

## How many scuppers do I need?

To adjust this table for other than a 5-inch design rain fall rate, multiply the square footage on the table by 5 then divide by the local design rain fall rate. Example: For 4 inches of design rainfall rate, a 4-inch long scupper with a 1-inch head would accommodate 287 square feet. (230 x 5) ÷4 = 287.

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## How does a roof scupper work?

A roof scupper is a drainage system for flat roofs that can’t rely on sloping to naturally move water through a gutter system. Scuppers are essentially small devices that work by giving the water a mechanism through which it can escape the roof without passing through the interior of the building.

## How do you install scupper?

Place the Scupper Retrofit Drain Assembly into the existing drain leader (vertical or horizontal) pipe. The drain flange(s) should be in contact with the surface of both the wall and roof. Using the pre-punched holes in the perim- eter of the flange, secure the drain flange to the substrate with appropriate fasteners.

## How big is a scupper?

The only unconditional guideline for scupper sizing provided by the code is that “scupper openings shall be not less than 4 inches (102 mm) in height and have a width that is equal to or greater than the circumference of a roof drain sized for the same roof area.”

## Where does roof drain water go?

They are most commonly found attached to the corners of a building. The discharge from a downpipe can be: Directly connected to a drain discharging into a soakaway. Directly connected to a drain discharging into a surface water sewer.

## What are roof drains called?

Many people ask, “What are roof drains called?” and they are simply called roof drainage systems. The drainage system starts at the roof line and then you have roof drainage to ground. The components that you need for a roof drainage system is a gutter system and downspout.

## What is a gutter collector box?

Collector Boxes and Scupper Boxes

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They are traditionally installed under the soffit to let air into the line which then prevents excess noise (gurgling) and helps stop vacuum lock. Conductor heads are also used under a valley area to drain rainwater to the next level or ground drain.

## What size drain is needed for a 5000 square foot roof?

According to the chart, for 1/8” slope per 12” of pipe, for 5,000 square feet of roof area, with a 6” per hour of rainfall, the required pipe size is 8”. To size the vertical roof drain for the same parameters – 5,000 square feet of room area and 6” per hour of rain – consult Table 1106.2(Figure 3).

## How do I calculate roof drainage?

Take the roof’s total square footage and divide by the total square footage handled by one drain. The result is the number of drains needed. For example: 50,000 / 4,400 = 11.36; or 12 drains required.