Boiler Insulation

Boiler insulation refers to the heat-resistant materials wrapped around boilers and their fittings to contain heat, which for much of the 20th century were made with asbestos. Because boilers run hot, asbestos was prized for insulating them in ships, power plants, factories, schools, and buildings. Installing, repairing, or removing this insulation released asbestos fibers into the air.

Origin

Asbestos boiler insulation came into wide use in the late 1800s and expanded through the mid-1900s as industry and shipping grew. It took the form of block, cement, blanket, and pipe-covering products applied by insulators and other tradesmen.

Significance in Asbestos Context

For many patients, boiler insulation is the exposure source that links their disease to a specific setting and set of products. Boilermakers, insulators, pipefitters, machinists, and especially Navy and merchant sailors worked around asbestos boiler lagging in tight, poorly ventilated spaces, and even bystanders nearby could inhale the fibers. Identifying the brands of insulation used, and where the work happened, helps connect the exposure to particular manufacturers and, often, to asbestos trusts set up by bankrupt makers. Cutting, mixing, or tearing out this material was especially dusty, so job tasks matter as much as job titles.

Example Sentence

As a boilermaker's helper, he spent years scraping off old boiler insulation, work his physician later connected to his mesothelioma.

Related Terms

Pipe Lagging, Insulator, Navy Veterans, Amosite, Bystander Exposure, Asbestos Trust

Notes

• Write down every workplace where you handled or worked near boilers, with dates, job tasks, and any product or brand names you recall.
• Ask coworkers or check union records to help identify the insulation manufacturers used at those sites.
• Preserve military service records (for Navy veterans) and employment records that place you in boiler or engine rooms.