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Other construction and civil engineering workers

How to become a Thermal Insulation Installer

Also called: Building insulator, Duct insulator, Thermal insulation worker, Lagger

Fits insulation to the ducts of heating and cooling systems and the pipes of water supply and drainage systems in buildings.

Workers in this job say high school is common. From job tag's survey of people in each job, who could give several answers. It shows what workers see as common, not how many workers hold each level.

How to become one

No particular education or qualifications are needed to start. People learn skills after joining, for example through an apprenticeship. A related qualification is the thermal insulation exam in the ginou kentei (national trade skills test) run by the Ministry of Health, Labour and Welfare. Large sites are often required to have a certified worker on site at all times, and foremen must hold the qualification. You need knowledge of the basics of heat transfer that underpin insulation work, how to handle tools and machines, and how to read building services drawings. Much of the work is done on scaffolding or work vehicles, so a certain level of fitness is needed. Almost all the work is done by hand with tools such as scissors, knives and saws, so nimble hands are also important.

Ways in

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Questions people ask

How do I become a Thermal Insulation Installer?

No particular education or qualifications are needed to start. People learn skills after joining, for example through an apprenticeship. A related qualification is the thermal insulation exam in the ginou kentei (national trade skills test) run by the Ministry of Health, Labour and Welfare. Large sites are often required to have a certified worker on site at all times, and foremen must hold the qualification. You need knowledge of the basics of heat transfer that underpin insulation work, how to handle tools and machines, and how to read building services drawings. Much of the work is done on scaffolding or work vehicles, so a certain level of fitness is needed. Almost all the work is done by hand with tools such as scissors, knives and saws, so nimble hands are also important.

How much does a Thermal Insulation Installer earn in Japan?

Average annual income in the private sector, bonus included, is ¥4,668,700 (Ministry of Health, Labour and Welfare). The figure is for the wage survey group Other construction workers, which covers several jobs.

Do you need a degree to become a Thermal Insulation Installer?

Usually not. In this job's census occupation group, only 20% of workers are university graduates. Ways in include: National trade skills test (技能検定).

Will AI change the work of a Thermal Insulation Installer?

Generative AI can do relatively little of this work, by the ILO's global estimate.

Sources

独立行政法人労働政策研究・研修機構（JILPT）作成 職業情報データベース 解説系ダウンロードデータ（IPD_DL_description_7_01.xlsx）ver.7.01 職業情報提供サイト（job tag）より2026年10月4日にダウンロード（https://shigoto.mhlw.go.jp/User/download）を加工して作成

独立行政法人労働政策研究・研修機構（JILPT）作成 職業情報データベース 簡易版数値系ダウンロードデータ（IPD_DL_numeric_7_00.xlsx）ver.7.00 職業情報提供サイト（job tag）より2026年10月4日にダウンロード（https://shigoto.mhlw.go.jp/User/download）を加工して作成

Sources: JILPT Occupational Information Database download data via job tag (解説系 ver.7.01 and 簡易版数値系 ver.7.00, downloaded 4 October 2026), processed by Peernovo; MHLW, Basic Survey on Wage Structure 2025; Statistics Bureau of Japan, 2020 Population Census; MEXT, School Basic Survey 2025; MHLW, Employment Referrals for General Workers (Hello Work statistics). Figures processed by Peernovo. English job names, translations and the matching of jobs to statistical groups, schools and degree fields by Peernovo.

Updated 4 October 2026