Heat and Frost Insulators Local 12 Asbestos Exposure Claims

A Resource for Members, Retirees, and Their Families Seeking Legal Representation

If You Worked as an Insulation Mechanic in Iowa, You May Be Running Out of Time to File

For decades, skilled tradespeople who belonged to Heat and Frost Insulators Local 12 in Des Moines performed some of the most technically demanding — and physically hazardous — insulation work in the state. Many former members and their families now face diagnoses that trace directly back to products they handled every day on the job. A mesothelioma diagnosis tied to union insulation work may entitle you to substantial compensation through asbestos trust funds, product manufacturers, or premises owners. An experienced asbestos cancer lawyer in Des Moines can evaluate your options at no cost.

Iowa’s statute of limitations under Iowa Code § 614.1 (personal injury) and Iowa Code § 614.1 (wrongful death)(2) gives you only two years from the date of diagnosis to file a claim. That window closes whether or not you are ready. If you believe you have an asbestos lawsuit in Iowa or need guidance on accessing an asbestos trust fund in Iowa, contact an attorney before that deadline eliminates your right to recover.

Who Were Heat and Frost Insulators Local 12?

Heat and Frost Insulators Local 12 was a Des Moines–based local affiliated with the International Association of Heat and Frost Insulators and Allied Workers (HFIAW). Occupational health researchers have identified heat and frost insulators as one of the crafts most consistently and heavily exposed to asbestos-containing materials across the American labor movement — a conclusion documented in peer-reviewed literature spanning more than five decades.

Worker Classifications Represented by Local 12

Local 12 represented the following classifications throughout central Iowa and surrounding regions:

Pipe coverers — installed and maintained thermal insulation on piping systems
Insulation mechanics — fabricated and installed custom insulation systems
Boiler house and maintenance insulators — maintained and repaired insulation on boilers and pressure vessels
Spray-applied insulation applicators — applied spray-on fireproofing and insulation in earlier decades
Allied workers — assistants and support personnel working alongside certified insulators

Members dispatched from this local hall reportedly worked at industrial, utility, and commercial job sites across the Des Moines metropolitan area and throughout Iowa, including facilities such as Iowa Steel in Iowa City, Quaker Oats in Cedar Rapids, Rockwell Collins in Cedar Rapids, and John Morrell in Sioux City.

The Work That Created the Health Risk

Peer-reviewed occupational health research — including landmark studies by Dr. Irving Selikoff published beginning in the 1960s — documented that heat and frost insulators experienced among the highest cumulative asbestos exposures of any construction craft. Understanding the specific tasks that generated exposure is essential for anyone pursuing an asbestos exposure claim in Iowa.

Job Tasks That Generated Asbestos Fiber Exposure

Pipe Covering and Insulation Installation

Insulation mechanics cut, shaped, and fitted pre-formed pipe insulation sections — commonly made from amosite (brown) asbestos or chrysotile asbestos — around steam lines, process piping, and hot water systems. Cutting asbestos pipe covering with knives or saws generated dense clouds of respirable fiber dust. Trimming ends and cementing joints extended that exposure throughout the workday.

Block Insulation on Boilers, Tanks, and Vessels

High-temperature applications required block insulation that, before the mid-1970s, routinely contained amosite or crocidolite asbestos. Workers cut these blocks to shape with hand saws and power tools, fitted them against curved boiler surfaces, and secured them with wire and asbestos-containing cements.

Asbestos Cement and Mastic Application

Finishing pipe and equipment insulation required workers to trowel or hand-apply asbestos-containing cements, mastics, and finishing coatings. Mixing powdered asbestos cement from bags was among the dustiest operations in the trade — generating airborne fiber concentrations far exceeding what are now recognized as safe limits.

Asbestos Cloth, Blankets, and Rope Packing

Flexible insulation applications around valves, flanges, expansion joints, and irregular equipment surfaces used woven asbestos cloth and blankets. Cutting and fitting these textiles released fibers. Rope packing for valve stems and pump seals contained asbestos throughout much of the trade’s history.

Insulation Removal and Maintenance Disturbance

Removing old asbestos insulation to allow pipe repairs or equipment replacement generated the highest fiber exposures of any task in the trade. Breaking apart deteriorated insulation — often friable and crumbling after years of service — released fiber concentrations far above installation-level exposures. Insulators performing removal work before regulatory controls took effect in the 1970s and 1980s may have been exposed to levels many times those generated by new installation.

Spray-Applied Asbestos Fireproofing

In earlier decades, insulation mechanics applied spray-on asbestos fireproofing and insulation to structural steel, ductwork, and ceilings. This process — now banned — generated particularly fine respirable fiber concentrations and contaminated entire work sites, exposing not only the applicators but every other trade working in the building.

Where Local 12 Members Worked: Facilities Across Iowa

Members dispatched through Heat and Frost Insulators Local 12 may have worked at numerous industrial, utility, and commercial facilities across the state. Understanding which sites employed Local 12 members is important context for pursuing an Iowa asbestos settlement or Polk County asbestos lawsuit. The facilities below are among those where Local 12 members are reported to have performed insulation work and where asbestos-containing materials were allegedly present.

Power Generation Facilities

MidAmerican Energy and Predecessor Companies

Iowa’s electrical generating stations — including facilities historically operated by Iowa Power, Iowa Public Service, and their successor MidAmerican Energy — ran steam-driven turbines and high-pressure boiler systems requiring continuous insulation maintenance. Members of Local 12 may have performed pipe covering and boiler insulation work at these facilities throughout central and western Iowa. Steam system insulation at power generating stations allegedly included amosite pipe covering, block insulation for boilers and vessels, and asbestos-containing boiler lagging. (Per occupational history records compiled in personal injury litigation involving Iowa power plant workers.)

Ottumwa Generating Station

The Ottumwa Generating Station along the Des Moines River reportedly employed insulation contractors whose crews may have included Local 12 members during major construction and maintenance outages. Boiler and turbine insulation at coal-fired generating stations of this era is well-documented in occupational health literature as having contained substantial quantities of asbestos-containing materials.

Neal Generating Station — Sioux City Area

The Neal Generating Station, a large coal-fired plant serving northwestern Iowa, is reported in asbestos litigation records to be a worksite where insulation mechanics may have encountered asbestos-containing pipe covering, boiler block insulation, and lagging materials.

Oil Refineries and Petrochemical Processing Facilities

Iowa’s petroleum distribution and refinery infrastructure included facilities where Local 12 members may have worked. Refineries and petroleum processing plants were among the heaviest industrial users of asbestos insulation, given the extreme temperatures involved and the volume of process piping requiring coverage. Asbestos-containing materials at such facilities allegedly included high-temperature pipe covering, vessel insulation, asbestos-containing gaskets on flanged connections, and expansion joint packing.

Industrial Manufacturing and Defense Facilities

Iowa Ordnance Plant and Defense Industry Facilities

Large manufacturing and defense production facilities in Iowa are reported to have employed insulation contractors affiliated with Local 12 for original construction and ongoing maintenance. Industrial boiler houses and steam distribution systems at manufacturing plants throughout the Des Moines area may have used asbestos-based insulation products standard throughout the industry during the mid-twentieth century.

Firestone Tire & Rubber Company — Des Moines

The Firestone manufacturing facility in Des Moines was a major industrial employer where insulation mechanics are reported to have performed work. Manufacturing plants of this scale operated extensive boiler rooms and steam distribution systems requiring periodic insulation work that allegedly involved asbestos-containing materials.

John Morrell & Co. and Iowa Meatpacking Facilities

Iowa’s meatpacking and food processing industry operated large refrigeration systems and steam sterilization equipment. Local 12 members may have performed both cold-side and hot-side insulation work at meatpacking facilities in Des Moines and surrounding communities. Refrigeration and steam piping insulation at these facilities is reported to have allegedly contained asbestos, particularly where rapid temperature cycling created demanding insulation requirements.

Hospitals and Institutional Buildings

Iowa Methodist Medical Center and Mercy Medical Center — Des Moines

Large Des Moines hospitals built or substantially renovated during the mid-twentieth century contain extensive mechanical systems — boiler plants, steam distribution piping, and HVAC systems — that were originally insulated with asbestos-containing materials. Insulation mechanics from Local 12 are reported to have performed work at Des Moines area hospitals during both original construction and subsequent maintenance and renovation work.

Iowa State Capitol and Government Buildings

State and county government buildings constructed or renovated between the 1920s and 1970s reportedly contained asbestos insulation allegedly installed by union insulators. Members of Local 12 may have performed work at state and county facilities throughout the Des Moines area.

Iowa State University — Ames

The campus steam distribution system at Iowa State University reportedly involved Local 12 members in insulation work. University steam tunnels and building mechanical rooms built during this era are well-documented in occupational health literature as locations where asbestos-containing pipe insulation was routinely installed.

Commercial Construction

Downtown Des Moines High-Rise Buildings

The commercial construction boom in Des Moines from the 1950s through the 1970s required substantial insulation work on mechanical systems. Local 12 members may have performed pipe covering and mechanical system insulation on numerous downtown commercial buildings, working with products that routinely contained asbestos until federal regulations began restricting its use in the mid-to-late 1970s.

Asbestos-Containing Products Reportedly Handled by Local 12 Members

Based on occupational history documentation from asbestos personal injury litigation, union benefit fund records, and published occupational health research, members of Heat and Frost Insulators Local 12 may have regularly worked with the following asbestos-containing products. Identifying which products you handled is critical information for your asbestos attorney in Iowa.

Pipe Insulation and Covering Products

Johns-Manville Thermobestos® and Kaylo® pipe covering — Among the most widely distributed asbestos-containing pipe insulation products in the United States, containing chrysotile and/or amosite asbestos. These products were distributed throughout Iowa and are documented in product identification records from Iowa construction projects.

Armstrong World Industries asbestos pipe insulation — Armstrong manufactured asbestos-containing pipe covering distributed nationally and reportedly used at Iowa industrial and commercial facilities.

Owens-Corning and Owens-Illinois asbestos pipe products — Various asbestos-containing insulation products from these manufacturers were reportedly distributed in the Iowa market.

Garlock Sealing Technologies asbestos products — Garlock manufactured asbestos-containing packing, gaskets, and supplementary insulation materials that Local 12 members may have encountered in valve and flange applications.

Union Carbide pipe insulation — Union Carbide’s asbestos-based insulation products were widely distributed during the decades when Local 12 members were most active in the field.

High-Temperature Block Insulation Products

Eagle-Picher block insulation — Eagle-Picher Industries manufactured high-temperature block insulation allegedly containing amosite asbestos, reportedly used in boiler and vessel insulation at Iowa power plants and industrial facilities.

Crane Co. asbestos insulation products — Crane manufactured asbestos-containing block and sectional insulation products, as well as asbestos-containing valves and fittings, reportedly encountered by insulation mechanics at Iowa industrial facilities.

Combustion Engineering and Babcock & Wilcox boiler insulation — These major boiler manufacturers supplied equipment to Iowa generating stations and industrial plants, and their associated insulation systems allegedly contained asbestos-containing materials through much of the mid-twentieth century.

Asbestos Cements, Mastics, and Finishing Materials

Carey asbestos cement and insulating cements — Philip Carey Manufacturing produced a line of as