Fuji Sash and Wood Friends Co. Started joint development of aluminum-clad wooden sashes

Fuji Sash Co. (Head office: Kawasaki City, Kanagawa Prefecture; President: Hiroyuki Ezaki) announces that it is jointly developing aluminum-clad wooden sashes with Wood Friends*1 (Nagoya City, Aichi Prefecture; President: Yoshihiro Ito), a Haseko Group company.

Image of aluminum-clad wood sash

Background and direction of joint development

In response to the growing demand for awareness raising in the construction industry toward the realization of carbon neutrality, we have been working to develop products that are both low-carbon and have excellent design features.

Ltd., which is involved in the "wood resource cascade project "*2 utilizing domestic wood and has abundant expertise in wood processing, we have decided to jointly develop a new aluminum-clad wooden sash.

Compared to metals and resins, carbon-fixing wood consumes less energy during the manufacturing process, and domestic wood in particular does not need to be transported long distances from overseas, thus enabling a significant reduction in CO2 emissions.

Furthermore, it has an established reputation for its high quality.

By combining the technologies and expertise of the two companies, we aim to bring domestic wooden sashes to the general market at an affordable price while maintaining their quality, which has been considered "expensive" until now.

What are aluminum-clad wooden sashes?

Aluminum-clad wood sash is a sash that utilizes the appearance of wood indoors and is covered with aluminum outdoors. By covering the exterior with aluminum, deterioration due to rain and ultraviolet rays is prevented and maintenance can be improved, while retaining the advantages of wood, such as high heat insulation and a warm appearance. 3

Plans for commercialization

Single-pane and casement windows are scheduled to be developed by the end of FY2025, with an eye toward use in housing complexes. More window types will be added as needed.

1 Wood Friends Inc. became a group company of Haseko Corporation on June 3, 2025.

2 A system that supports a sustainable society by utilizing all of Japan's forest resources.

3 Wooden parts may require appropriate maintenance depending on the environment in which they are used.