Launched TensoDiaRoof, a lightweight structural membrane roof.

(Tokyo headquarters: Setagaya-ku, Tokyo; Osaka headquarters: Yodogawa-ku, Osaka; President: Yumi Nomura; hereafter “Taiyo Kogyo”), a manufacturer of large membrane structures (tent structures), civil engineering and logistics materials, and other products, has developed the “TensoDiaRoof” (Tension x Diagrid x Roof), a lightweight structural membrane roof ideal for parking lots, parks, sports grounds, and other facilities, in collaboration with space structure manufacturer Kyushu Daiichi Industry Co. (Head Office: Fukuoka City, Fukuoka Prefecture; President: Toshiaki Kuroki), a manufacturer of space structures, will launch TensoDiaRoof (Tension x Diagrid x Roof), a lightweight structural membrane roof ideal for parking lots, parks, sports fields, etc., from November 2025.

In recent years, frequent heat waves and torrential rains have increased demand for roofs to protect public spaces such as playgrounds and parks from the sun and rain, where roofs had not previously been installed. In response to these needs, the two companies have developed a new type of membrane roof that can be retrofitted to existing spaces without the need for scaffolding.

The TensoDiaRoof is a lightweight roof structure consisting of a steel purlin covered with a soft, light-transparent membrane material. The lattice purlin is made of square steel tubes rigidly joined in a lattice pattern, increasing the rigidity of the entire roof and ensuring structural strength while reducing the amount of steel used by about 10% compared to a typical structure. In addition, the construction method does not require scaffolding, contributing to a reduction in total construction costs. This lattice main building was developed based on the steel frame technology that Kyushu Daiichi Kogyo has cultivated over many years, and has received a rating from the Building Center of Japan (BCJ).

Taiyo Kogyo devised a design to match the newly developed membrane anchorage hardware to the lattice purlin. The hardware was made larger than before to increase allowable stress and rigidity, and the distance between the fulcrums was extended to 3,000 mm. This allows for flexible adjustment of the support points with the lattice purlin, and the design effect brings variety and design to the steel frame of the membrane base, which tends to be monotonous.

TensoDiaRoof is a new type of membrane roof that combines design, structural rationality, and workability while achieving high precision and low cost through unit production at a factory. TensoDiaRoof can be used not only for parking lots, but also for public spaces such as playgrounds and parks, and can be used for a wide variety of applications.

Product Name	TensoDiaRoof
Manufactured by	Kyushu Daiichi Kogyo Corporation, Taiyo Kogyo Corporation
Distributor	Taiyo Kogyo Corporation
Recipients	Parking operators, local governments, shopping malls and entertainment facilities, etc.
Method of supply	Build-to-order

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. We aim to “soften the world and warm the future.