ETFE film was installed to provide both rain protection for spectator seating and natural light acquisition on the pitch.

(Tokyo Head Office: Setagaya-ku, Tokyo; Osaka Head Office: Yodogawa-ku, Osaka; President: Yumi Nomura; hereafter “Taiyo Kogyo”), a company involved in large-scale membrane structures (tent structures) and civil engineering and logistics materials, has applied a lightweight, high-transparency, high-performance fluoropolymer ETFE film to the recently completed new Hiroshima City Soccer Stadium (EDION Peace Wing Hiroshima). The new stadium is a lightweight, highly transparent, high-performance fluoropolymer ETFE film. This material, which provides both rain protection for spectator seating and natural light on the pitch, which is essential for turf maintenance, has also been used overseas at Mercedes-Benz Stadium in the U.S. (installed by our U.S. subsidiary Birdair, Inc. This is the first time that the system has been used for a large-scale stadium in Japan.

ETFEフィルムはフッ素樹脂をフィルム状に圧延したもので、ガラスに代わる新しい建築表現が可能な材料として注目されており、国内では、有明地区へ移設している新豊洲Brilliaランニングスタジアムの屋根やユニクロ心斎橋のファサードに使用されています。
今回使用したETFEフィルム膜材は、わずか500μm（マイクロメートル）の薄さで、重量874g/㎡と超軽量です。ガラスと比較すると製造工程でCO2排出を大きく低減できるほか、輸送による環境負荷も減らすことができる素材です。膜構造の特徴である変形追随性に優れているため、建築躯体への負荷を軽減し耐震性に優れています。

(i) Durability
Despite its thickness of 0.5 mm, the durability is about 25 years. Since it has fire retardant performance, it can be used for some applications in Article 22 areas of the Building Standard Law, which are areas where the roofs of buildings must be made of noncombustible materials or thatched.
(ii) Transparency
Maintains a high light transmittance (transparent, 500 μm) visible light transmittance of 86.8% in all areas of ultraviolet, visible light, and infrared rays. Light transmitted can be controlled by using different film types (transparent, pearlescent, white, blue, dot print, etc.).
3) Earthquake resistance
ETFE film (500 μm) weighs approximately 874 g/m2, which is lighter than other common building materials. As with conventional membrane structures, this film can reduce the load on the building frame and improve earthquake resistance. In addition, because of its superior deformation-following property, it does not break and shatter like glass, keeping the interior space safe.

本スタジアムは欧州を始めとした海外のスタジアム屋根や建築物のファサードに多く使用されているETFEフィルムを日本で初めて屋根に採用しました。観客席上の透明感の高い開放的な屋根は、街や人々との繋がりを生む広島の街なかスタジアムのコンセプトとも合致しています。
スタジアムのみならず、附帯施設も含めて世界基準のスタジアムとして、人々が集う交流の場が完成したことを非常に嬉しく思っています。

In this project, the steel framework is minimized as much as possible, and a new tension-type ETFE membrane roof with a single-layer ETFE reinforced with cables is realized, creating the only solution to the contradictory problems of rain protection and natural light acquisition on the pitch. We believe that this new option will break the stereotype that natural turf growth requires a compromised roof and that stadium membrane roofs are white. We will continue to strive to find new possibilities for membrane structures.

Owner: Hiroshima City
・Design and construction: Taisei Corporation, Fujita Corporation, Hirosei Corporation, Higashihata Architects & Engineers, Kankyo Design Institute, Fukken Survey & Design, Ai Sekkei, CKT joint venture
・Operator: Sanfrecce Hiroshima Corporation (designated manager)
Construction period (overall): February 2022 – December 2023
・Structure: Reinforced concrete, partly steel-framed and steel-reinforced concrete
・Seating capacity: 28,520 seats
・Scale (site): 49,914.04m2
・Scale (building area): 26,056.26m2
・Scale (total floor area): 65,878.00m2
・ Use of ETFE film: 1,538 m2
① Eaves on the south side of the stadium
9 panels of 8m x 16m and 2 panels of 1m x 16m total 1,200 m2
② Entrance eaves: 2 locations in the southeast and southwest
13m x 13m total 338 m2
・ETFE film installation period: August – October 2023

Taiyo Kogyo is a leading manufacturer of large membrane surface structures that are economical, easy to install, translucent, and well designed. Under the corporate philosophy of “Unlocking the infinite possibilities of membranes to deliver an inspiring and comfortable environment to our customers. Under the corporate philosophy of “We will bring excitement and a comfortable environment to our customers by exploiting the infinite possibilities of membranes,” TSP Taiyo has been supporting the safety and security of society by utilizing the characteristics of light and strong materials to expand its business in various fields including construction, as symbolized by the roof of the giant dome, civil engineering, logistics, and environmental fields.
Together with group companies such as TSP Taiyo Corporation, which provides event consulting services, and ACTIO Corporation, which manages facilities, we are working to “make the world softer and the future warmer. We aim to “make the world soft and the future warm. TSP Taiyo Corporation, the event consulting firm, and Actio Corporation, the facility management firm.

Photos for the press can be downloaded from here.

Public Relations Department, Taiyo Kogyo Corporation Phone: 06-6306-3033