Daiichi Kasei Co., Ltd.

Daiichi Kasei Co., Ltd. is a Japanese construction specialist headquartered in Matsumoto, Nagano Prefecture, focused on FRP (fiber-reinforced plastic) waterproofing and anti-corrosion works. The company positions itself as a dedicated contractor within the broader waterproofing field, emphasizing technical expertise and honest workmanship to extend the service life of buildings and industrial facilities. Its services cover waterproofing for rooftops, balconies, pools, and water tanks, as well as anti-corrosion work for chemical tanks, sewage treatment facilities, and piping equipment. The firm handles projects from initial site surveys through execution and aftercare, and it serves public-sector facilities, factories, and general customers. Operating primarily across Nagano Prefecture, it also undertakes work in Yamanashi, Niigata, and Tokyo. Daiichi Kasei was established on October 30, 1989, and is led by representative director Kei Okada. It holds a Nagano Prefectural Governor construction business license (general-2, No. 19999) and lists Hachijuni Bank as its main banking partner.

Daiichi Kasei Co., Ltd. was established on October 30, 1989, in Matsumoto, Nagano Prefecture, Japan. From its founding, the company specialized in FRP (fiber-reinforced plastic) waterproofing and anti-corrosion works, a niche within the broader construction and waterproofing industry. Over the years, it built a track record in public-sector facilities, factories, and general residential projects, primarily in Nagano Prefecture. The company expanded its service area to include Yamanashi, Niigata, and Tokyo, offering on-site work in those regions. It holds a Nagano Prefectural Governor construction business license (general-2, No. 19999). As of 2025, the company is led by Representative Director Kei Okada and maintains its headquarters in Matsumoto with a sales headquarters in Shiojiri, Nagano. In November 2025, it launched its official website to share information about its services and projects.

• Company founded in Matsumoto, Nagano, Japan.

• Official website launched.

Specialist contractor for FRP waterproofing and anti-corrosion, trusted for technical quality and reliable on-site response.

• FRP waterproofing

  Fiber-reinforced plastic waterproofing for rooftops, balconies, pools, and water tanks.

• Anti-corrosion works

  Anti-corrosion lining for chemical tanks, sewage treatment facilities, and piping.

• Waterproofing repair

  Renovation of existing waterproofing systems, such as upgrading sheet waterproofing to FRP.

• Painting works

  Related painting and maintenance services.

1. 1Official website homepagedaiichikasei.com
2. 2Company information pagedaiichikasei.com
3. 3Wikidata entrywikidata.org