Large-Capacity Model Added to "Flat Roof High Drainage System" to Enhance Rainwater Drainage Efficiency!
Sekisui Chemical Co., Ltd. has launched the new large-capacity "High Drainage Catch Basin 125-150" for its flat roof drainage system, designed for large non-residential facilities to combat intensifying guerrilla rainstorms.
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- 📰 Published: April 23, 2026 at 20:00
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April 23, 2026
Sekisui Chemical Co., Ltd.
The Urban Infrastructure & Environmental Products Company (President: Yoshiyuki Hirai) of Sekisui Chemical Co., Ltd. (President and Representative Director: Ikusuke Shimizu) has expanded its lineup of the "Flat Roof* High Drainage System," which is effective against intensifying guerrilla rainstorms, and will launch a new large-capacity type, the "High Drainage Catch Basin 125-150," compatible with large non-residential facilities.
*A flat roof with almost no slope
1. What is the Flat Roof High Drainage System?
This is a rainwater drainage system that achieves high drainage capacity by continuously generating a siphonic phenomenon using "Color Pipes" used in large buildings and the specially developed "High Drainage Catch Basin."
Since its launch in 2022, it has been well-received for enabling high rainwater drainage for flat-roof structures such as logistics warehouses, factories, offices, educational facilities, and medical and welfare facilities.
[Normal Drainage] [Flat Roof High Drainage System / Large Capacity Type]
2. Background
In recent years, short, intense downpours, commonly known as guerrilla rainstorms, have become more frequent and severe, leading to increased damage such as flooding and water leakage into buildings. Under these circumstances, there is an increase in buildings with large flat roof areas to effectively utilize the rooftop, such as commercial facilities with rooftop parking lots, and large facilities using the space for water tanks, outdoor air conditioning units, or recreational areas.
The previous "High Drainage Catch Basin 75-150" of the flat roof high drainage system was generally compatible with roof areas of less than 5,000 square meters. However, with the recent rapid increase in large-scale logistics facilities and data centers, there has been a demand for an even larger capacity type of the "High Drainage Catch Basin."
With the newly launched large-capacity lineup, the "High Drainage Catch Basin 125-150," locations that previously required size 200 downpipes can be downsized to size 125 while maintaining equivalent drainage capacity. Furthermore, in recent rainwater drainage designs for buildings, conventional rainfall intensity standards are being revised to prevent flooding and internal water leakage, tending to require larger rainwater drainage components. This system allows for downsizing while achieving more reliable high rainwater drainage.
■ "High Drainage Catch Basin 125-150" for Flat Roof High Drainage System Large Capacity Type
The "siphon induction member" built into the high drainage catch basin continuously generates a siphonic phenomenon, draining water in a full-pipe state, thereby improving drainage capacity.
"High Drainage Catch Basin 125-150"
■ High Drainage Capacity & Harmonious Design
It demonstrates a drainage capacity equivalent to size 200 with a size 125 pipe. This allows size 200 (compatible with φ216 caliber) downpipes to be changed to size 125 (compatible with φ140 caliber), resulting in a cleaner building exterior.
Additionally, the extensive lineup of Color Pipes harmonizes with the exterior designs of various buildings.
■ Benefits
1) Harmonious Design
Downsizing the downpipes cleans up the exterior, and the rich lineup of Color Pipes harmonizes with the building's exterior design.
2) Improved Piping Flexibility
It meets requests such as wanting to route rainwater drainage together while avoiding the front of the building.
3) Improved Workability
By changing the piping from size 200 to size 125, the weight is reduced to about 2/3. Handling becomes smoother, workability improves, and it contributes to a "shorter construction period." It also saves space for material storage on site. Furthermore, commercially available roof drains (horizontal type) can be used as they are not custom-made, making procurement easy.
4) Improved Economics
It contributes to cost reduction through the decrease in materials used (size 200 -> size 125, number of pipes installed), improved workability, and shorter on-site construction periods.
■ Lineup
(Reference)
Click here for product introduction of the "Flat Roof High Drainage System"
https://www.eslontimes.com/kenzai/large_buildings/flat-roof.html
End
Contact Information for this matter
Sekisui Chemical Co., Ltd.
Urban Infrastructure & Environmental Products Company, Building Materials Division
https://anet.sekisui.co.jp/contact/kenzai/ja/form/index.html
Sekisui Chemical Co., Ltd.
The Urban Infrastructure & Environmental Products Company (President: Yoshiyuki Hirai) of Sekisui Chemical Co., Ltd. (President and Representative Director: Ikusuke Shimizu) has expanded its lineup of the "Flat Roof* High Drainage System," which is effective against intensifying guerrilla rainstorms, and will launch a new large-capacity type, the "High Drainage Catch Basin 125-150," compatible with large non-residential facilities.
*A flat roof with almost no slope
1. What is the Flat Roof High Drainage System?
This is a rainwater drainage system that achieves high drainage capacity by continuously generating a siphonic phenomenon using "Color Pipes" used in large buildings and the specially developed "High Drainage Catch Basin."
Since its launch in 2022, it has been well-received for enabling high rainwater drainage for flat-roof structures such as logistics warehouses, factories, offices, educational facilities, and medical and welfare facilities.
[Normal Drainage] [Flat Roof High Drainage System / Large Capacity Type]
2. Background
In recent years, short, intense downpours, commonly known as guerrilla rainstorms, have become more frequent and severe, leading to increased damage such as flooding and water leakage into buildings. Under these circumstances, there is an increase in buildings with large flat roof areas to effectively utilize the rooftop, such as commercial facilities with rooftop parking lots, and large facilities using the space for water tanks, outdoor air conditioning units, or recreational areas.
The previous "High Drainage Catch Basin 75-150" of the flat roof high drainage system was generally compatible with roof areas of less than 5,000 square meters. However, with the recent rapid increase in large-scale logistics facilities and data centers, there has been a demand for an even larger capacity type of the "High Drainage Catch Basin."
With the newly launched large-capacity lineup, the "High Drainage Catch Basin 125-150," locations that previously required size 200 downpipes can be downsized to size 125 while maintaining equivalent drainage capacity. Furthermore, in recent rainwater drainage designs for buildings, conventional rainfall intensity standards are being revised to prevent flooding and internal water leakage, tending to require larger rainwater drainage components. This system allows for downsizing while achieving more reliable high rainwater drainage.
■ "High Drainage Catch Basin 125-150" for Flat Roof High Drainage System Large Capacity Type
The "siphon induction member" built into the high drainage catch basin continuously generates a siphonic phenomenon, draining water in a full-pipe state, thereby improving drainage capacity.
"High Drainage Catch Basin 125-150"
■ High Drainage Capacity & Harmonious Design
It demonstrates a drainage capacity equivalent to size 200 with a size 125 pipe. This allows size 200 (compatible with φ216 caliber) downpipes to be changed to size 125 (compatible with φ140 caliber), resulting in a cleaner building exterior.
Additionally, the extensive lineup of Color Pipes harmonizes with the exterior designs of various buildings.
■ Benefits
1) Harmonious Design
Downsizing the downpipes cleans up the exterior, and the rich lineup of Color Pipes harmonizes with the building's exterior design.
2) Improved Piping Flexibility
It meets requests such as wanting to route rainwater drainage together while avoiding the front of the building.
3) Improved Workability
By changing the piping from size 200 to size 125, the weight is reduced to about 2/3. Handling becomes smoother, workability improves, and it contributes to a "shorter construction period." It also saves space for material storage on site. Furthermore, commercially available roof drains (horizontal type) can be used as they are not custom-made, making procurement easy.
4) Improved Economics
It contributes to cost reduction through the decrease in materials used (size 200 -> size 125, number of pipes installed), improved workability, and shorter on-site construction periods.
■ Lineup
(Reference)
Click here for product introduction of the "Flat Roof High Drainage System"
https://www.eslontimes.com/kenzai/large_buildings/flat-roof.html
End
Contact Information for this matter
Sekisui Chemical Co., Ltd.
Urban Infrastructure & Environmental Products Company, Building Materials Division
https://anet.sekisui.co.jp/contact/kenzai/ja/form/index.html