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  5. Wall and rooftop greenery
  6. Rooftop greening method: Evergreen Kiri-so bag method - A safe and secure rooftop greening method.

Rooftop greening method: Evergreen Kiri-so bag method - A safe and secure rooftop greening method.

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last updated:Nov 07, 2023

緑化計画研究所
緑化計画研究所
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Roof greening method that does not require watering - a simple and safe roof greening method.

The "Evergreen Kiri Grass Bag Method" for rooftop greening is a method developed with consideration for the recent climate in Japan. It utilizes the resilient evergreen Kiri grass. 【Rooftop Greening Revolution】 Recent heavy rains and strong winds have begun to turn what were once considered abnormal weather phenomena into the norm. The plants used in traditional thin-layer rooftop greening have primarily been sedums, but they have been declining due to the recent weather conditions. Additionally, heavy rains and strong winds have caused soil erosion and overgrowth of weeds. Until now, rooftop greening has involved many complex systems that only specialized contractors could manage. The rooftop greening revolution aims to break away from these existing methods and maintain a green oasis easily and sustainably. The system that has made this rooftop greening revolution possible is the fail-proof rooftop greening system "Evergreen Kiri Grass Bag MethodⓇ." 【Features of the Evergreen Kiri Grass Bag Method】 ■ Soil erosion prevention ■ Weed control ■ Easy greening ■ Low maintenance ■ No watering required The Evergreen Kiri Grass Bag Method is a new greening approach that places soil specifically for evergreen Kiri grass into bags, achieving "soil erosion prevention," "weed control," and "easy greening." Search for "Rooftop Greening Revolution" on YouTube to find videos of soil erosion experiments. You can access the video page through the related links below.

    Wall and rooftop greeneryPlanting workSpecial Construction Method
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Rooftop greening method: Evergreen Kiri-so bag method - A safe and secure rooftop greening method.

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  • Related Link - https://kirinsou.jp/system/#experiment1

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basic information

This is a method of evergreen sedum bagging using a zipper-type planting bag (FTM bag). It is a triple intellectual property product consisting of a bagging method (Patent No. 4911418 + Registered Trademark No. 6125712) and a variety registration (Variety Registration No. 15866). The triple intellectual property of the evergreen sedum bagging method (patent, trademark, and variety registration) leads to successful rooftop greening. 1. Prevents the intrusion of weeds. 2. Prevents soil runoff. 3. Easy installation with a zipper. The standard size of the bag is 50 cm square, with a wet weight of 13 kg per bag. There is also a rectangular type measuring 15 cm x 100 cm available. Grommet options and custom sizes are possible. The rectangular type is used for wall greening and folded plate roof greening. The bag is made of root barrier material, which stops the intrusion of weeds and prevents soil scattering and runoff. The bag allows the evergreen sedum to provide moisture to the soil while preventing soil drying. The site receives bags filled with soil and seedlings of evergreen sedum, so you simply open the zipper of the bag, insert the seedlings, and close the zipper. It is a simple greening system that completes the greening by just arranging the bags containing the plants.

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Applications/Examples of results

【Evergreen Giraffe Grass Bag Method Achievements】 〇 Over 500 private facilities 〇 Over 50 public facilities Many others 【Greening Applications】 〇 Rooftop greening, folded plate roof greening, wall greening, slope greening, erosion control dam greening, road greening, concrete slope greening, environmental greening, weed control under solar panels, etc. 【Applications】 〇 Government and public agency facilities 〇 Factories, offices, commercial facilities 〇 Apartments, residential buildings 〇 Civil engineering structures, erosion control dams, slopes 〇 Ground cover 〇 Weed control

Detailed information

  • イプロス詳細-土壌流出実験.jpg

    Soil Erosion Experiment One of the reasons for the failure of rooftop greening is "soil erosion." We recreated heavy rain by bursting large water balloons and conducted an erosion experiment comparing the rooftop greening systems "bag method vs. traditional method." Recently, extreme weather events have increased, and the occurrence of "intense rain" with rainfall amounts exceeding 80 mm per hour has increased by about 1.7 times over the past 30 years. Such heavy rain can wash away the soil and plants of rooftop greening, causing problems such as clogging drainage systems. For a video comparing soil dispersion experiments, please visit https://kirinsou.jp/system/#experiment1.

  • イプロス詳細-土壌飛散実験.jpg

    Soil Dispersal Experiment One of the reasons for the failure of rooftop greening is "soil dispersal." We conducted a dispersal experiment comparing the rooftop greening system "bag method vs. conventional method" by creating strong winds using a blower and a circulator. Recently, it has been predicted that there is a trend of increasing occurrences of extremely strong tropical cyclones, with maximum wind speeds over 45 m/s, due to the rise in abnormal weather. In such severe weather, the soil and plants from rooftop greening can be dispersed, causing issues such as clogging drainage systems. For a video of the soil runoff comparison experiment, please visit https://kirinsou.jp/system/#experiment2.

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    Rooftop Greening Revolution: A Rooftop Greening System That Doesn't Fail - "Evergreen Kiri Grass Bag Method" Case Study: Roof Greening This is roof greening using the rooftop greening system "Evergreen Kiri Grass Bag Method," which does not fail. Since it is on the roof surface, it is secured with a windbreak net. The Asakusa Culture and Tourism Center is a tourist information facility located in Taito Ward, in front of the Kaminarimon Gate. The first floor features an information counter that supports Japanese, English, Korean, and Chinese, as well as a foreign currency exchange service, while the second floor has a tourism information corner. The top floor, the 8th floor, is a free observation terrace. Due to the existing building being over 50 years old and deteriorating, a competition was held in 2008, and the proposal by Kengo Kuma was adopted. The initial plan had a height of 41.25 meters, but voices of opposition arose from Senso-ji Temple and the local shopping district, claiming it would disrupt the harmony of the streetscape, leading to a reduction of about 2 meters, resulting in a height of 38.9 meters. In 2012, it received the Good Design Award. For more details on the rooftop greening revolution and the "Evergreen Kiri Grass Bag Method" that doesn't fail, please visit https://kirinsou.jp.

  • const07-eye.jpg

    Rooftop Greening Revolution: A Fail-Proof Rooftop Greening System "Evergreen Kiri Grass Bag Method" Case Study: Rooftop Greening (Also Accommodates Curves) This is a rooftop greening project of approximately 180 square meters using the fail-proof rooftop greening system "Evergreen Kiri Grass Bag Method." The rooftop greening area is divided into buildings A to D, and the shapes are not rectangular, with curved sections present throughout the rooftop greening. This cannot be accommodated by conventional tray-type greening. The Evergreen Kiri Grass Bag Method also accommodates square sizes of 50cm, 25cm, and rectangular sizes of 15cm x 50cm. Since the bags have flexibility, they can be shaped on-site to fit the design. Additionally, custom sizes can be ordered, allowing for rooftop greening tailored to the site. The flexibility of the bags also enables greening on curved surfaces. For more details on the Rooftop Greening Revolution and the fail-proof rooftop greening system "Evergreen Kiri Grass Bag Method," please visit https://kirinsou.jp.

  • const06-eye.jpg

    Rooftop Greening Revolution: A Fail-Proof Rooftop Greening System "Evergreen Kiri Grass Bag Method" Case Study: Rooftop Greening (Rooftop Greening by Middle School Students) The students themselves carried materials up to the rooftop, planted in bags, and arranged the bags to complete the rooftop greening. The photo below was taken as a graduation memorial. The school's science club played a central role in this rooftop greening project. The science club measured the temperature of classrooms that were not greened and the classroom directly below the rooftop greening, using thermography to investigate the temperature distribution in the classrooms. In the classroom directly below the rooftop greening, the overall temperature was shown in blue, confirming the effectiveness of the rooftop greening. For more details on the Rooftop Greening Revolution and the fail-proof rooftop greening system "Evergreen Kiri Grass Bag Method," please visit https://kirinsou.jp.

  • const27-eye.jpg

    Rooftop Greening Revolution: A Fail-Proof Rooftop Greening System "Evergreen Kiri Grass Bag Method" Case Study: Rooftop Greening (Greening by Children, Rooftop Greening by Middle School Students) To combat the summer heat at the community meeting place, we implemented the Evergreen Kiri Grass Bag Method. The meeting place is a prefab structure, making it quite hot in the summer as the air conditioning does not work well. The greening was done by the children of the neighborhood. Name tags are provided for the Evergreen Kiri Grass bags, allowing participants to write their names. By participating in greening activities, the children's feelings towards community building improve, and a sense of attachment to the plaza also develops. For more details on the Rooftop Greening Revolution and the fail-proof rooftop greening system "Evergreen Kiri Grass Bag Method," please visit https://kirinsou.jp.

  • const04-eye.jpg

    Rooftop Greening Revolution: A Fail-Proof Rooftop Greening System "Evergreen Kirinsou Bag Method" Case Study: Slope Greening A sediment control dam, known as a "sabo dam," is a type of dam installed in rivers. It is also referred to as a "sediment control dam." This facility captures harmful sediment such as debris flows that flow down from upstream and gradually releases the accumulated sediment to regulate the amount of sediment flowing downstream. By accumulating sediment in the sediment control dam, the slope of the river becomes gentler, preventing the riverbed and banks from being eroded, while also weakening the destructive power of debris flows. Additionally, it helps stabilize the foothills on both sides, preventing landslides on the mountain slopes. However, the construction of large concrete walls in mountainous areas can lead to landscape issues. Until now, greening has been difficult on sediment control dams, and maintaining the greenery has also been challenging. The Evergreen Kirinsou Bag Method has made it possible to easily green these areas. The greening of sediment control dams blends well with the surrounding scenery. For more details on the Rooftop Greening Revolution and the fail-proof rooftop greening system "Evergreen Kirinsou Bag Method," please visit https://kirinsou.jp.

  • const08-eye.jpg

    Rooftop Greening Revolution: A Fail-Proof Rooftop Greening System "Evergreen Kiri Grass Bag Method" Case Study: Slope Greening Using the Evergreen Kiri Grass Bag Method, we implemented greening with letters as a landmark for the interchange. Evergreen Kiri Grass is resilient to heat, cold, and drought, making it a low-maintenance plant. It replaces its new shoots around November, ensuring that it does not grow excessively and alter the shape of the letters. The bag method is made from weed prevention sheets, effectively preventing weed intrusion and soil erosion. With this combination of low-maintenance plants and the bag method, it is possible to create such lettering through a greening system. For more details on the Rooftop Greening Revolution and the fail-proof rooftop greening system "Evergreen Kiri Grass Bag Method," please visit https://kirinsou.jp.

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Rooftop Greening Revolution - Soil Erosion and Dispersion Experiment - Evergreen Kiri Grass Bag Method

Rooftop Greening Revolution - Soil Erosion and Dispersion Experiment - Evergreen Kiri Grass Bag Method

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Rooftop Greening Revolution B - A Rooftop Greening System That Won't Fail - Evergreen Kiri Grass Bag Method

Rooftop Greening Revolution B - A Rooftop Greening System That Won't Fail - Evergreen Kiri Grass Bag Method

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Rooftop Greening Revolution A - A Fail-Proof Rooftop Greening System - Evergreen Kiri Grass Bag Method

Rooftop Greening Revolution A - A Fail-Proof Rooftop Greening System - Evergreen Kiri Grass Bag Method

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Fail-proof Rooftop Greening System 'Evergreen Kiri Grass Bag Method' (Overview Version)

Fail-proof Rooftop Greening System 'Evergreen Kiri Grass Bag Method' (Overview Version)

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緑化計画研究所

緑化計画研究所

Other construction industries

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In manufacturing, there are people, and in projects, there is drama. The "passion" of three individuals transcends the boundaries of the company, leading to "co-creation" and "hope." In April 2007, at an exhibition, a project team was born. They wanted to create new solutions originating from the field to solve customers' problems. Three professionals who shared such passionate thoughts met, and the Evergreen Kiri-Sou Promotion Association was established. Professionals in plants, architecture, civil engineering, and facilities breathe new life into the city. Moments of inspiration are continuous. The opportunities to experience moments where the heartbeat never stops are becoming fewer. Why is that? Perhaps it is because of the increase in fakes and deceptions. We aim to remain professionals involved in plants, architecture, civil engineering, and facilities, and we operate the Evergreen Kiri-Sou Promotion Association. The professionals have developed new greening methods and greening systems. That is the Evergreen Kiri-Sou bag method.

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