IW Iron Workers Asbestos Workplaces

Through the asbestos era, members of the International Association of Bridge, Structural, Ornamental and Reinforcing Iron Workers (IW / IABSORIW) were dispatched to virtually every category of commercial high-rise, industrial process plant, infrastructure project, and marine construction site in the United States. The categories below represent the broad workplace types where IW members allegedly erected structural steel skeletons beneath sprayed asbestos fireproofing, tied reinforcing steel in asbestos-overspray environments, and set precast and asbestos-cement panels across a career. State-specific jobsite documentation is linked from within each Local page on this site.

Commercial high-rise construction

The single largest and most defining category of asbestos-era iron work in America. From roughly the mid-1950s through the 1973 EPA ban on spray-applied asbestos, virtually every commercial high-rise built in every major U.S. central business district — Manhattan, Chicago Loop, downtown Los Angeles, downtown Houston, downtown St. Louis, downtown Pittsburgh, downtown Detroit, downtown Cleveland, downtown Atlanta, downtown Boston, downtown Philadelphia — had its structural steel skeleton allegedly coated in sprayed asbestos fireproofing. IW members allegedly worked:

• Column plumbing-up and moment-connection bolt-up + weld-out — directly on columns being sprayed by the fireproofing crew on floors above and below
• Beam-to-column connections and diagonal bracing — inside the active spray cloud
• Metal floor deck installation and puddle-welding — beneath the sprayed underside of the deck above
• Curtain-wall and ornamental steel installation — in occupied envelopes coated with sprayed asbestos

The high-rise structural iron worker allegedly experienced the trade’s most concentrated career-long exposure to sprayed asbestos fireproofing.

Industrial process plants — refineries, chemical, and process construction

Petroleum refineries along the Gulf Coast, Mississippi River corridor, Great Lakes belt, and West Coast — and the petrochemical, ammonia, chlor-alkali, sulfuric acid, and polymer plants co-located with them — required IW members for structural steel erection of process structures, piperack + pipe-bridge steel, reactor and column support steel, cooling tower structural frames, and heater and boiler structural framing. Iron workers allegedly:

• Erected process structures where sprayed asbestos fireproofing was applied to columns, beams, and heater framing per hydrocarbon-fire code
• Set piperack steel that later carried asbestos-covered process piping installed by the UA
• Bolted-up and welded reactor and column support steel adjacent to asbestos-lagged vessels and heater walls
• Installed structural steel around fired heaters and process furnaces lined with asbestos-refractory brick and castable

Steel mill construction + rebuild

The integrated steel mills of Pittsburgh, Cleveland, Detroit, Chicago/Calumet, Buffalo, Youngstown, Gary, Birmingham, and Baltimore — and the mini-mills that followed them — required IW members for the largest and most asbestos-adjacent structural work in the American industrial base:

• Blast furnace structural steel — cast house columns and beams, blast furnace stove framing, and top-cone structural work — adjacent to asbestos-refractory brick and castable
• BOF (basic oxygen furnace) shell + BOF-shop structural framing — adjacent to BOF hood castable and asbestos-refractory brick linings
• Reheat furnace structural steel — adjacent to asbestos-refractory brick, board, and blanket linings
• Coke oven structural steel — battery pushing-side and coal-side steel adjacent to asbestos-refractory monolithic linings
• Rolling mill mill-floor structural framing — the runout tables, drive stands, and mill housing structural work
• Powerhouse and boiler-house structural framing on the mill’s captive utility plant

Bridge + highway construction

Bridge iron workers erected the structural steel for interstate highway system bridges, urban river crossings, viaducts, and rail bridges across the asbestos era. Iron workers allegedly:

• Erected steel plate-girder and box-girder bridge superstructures
• Placed and tied rebar on cast-in-place concrete bridge decks
• Set precast box girders — some categories of which allegedly used asbestos-cement content in the era
• Worked on bridge abutment and pier construction where asbestos-refractory brick + castable was allegedly used in expansion-joint pockets and drainage components
• Set asbestos-cement culvert pipe, drainage pipe, and pressure pipe (Transite) as part of highway construction packages

Navy shipyards + shipbuilding

IW members — through structural iron workers, ship fitters, and welders at the private and public naval shipyards along the East, Gulf, and West coasts — allegedly performed the structural steel work on Navy combatants, submarines, auxiliaries, amphibious ships, and Coast Guard cutters:

• Structural bulkhead installation — steel bulkhead plate work directly adjacent to Kaylo and Marinite panel installation by the insulators
• Deck plate work — cutting, welding, and installing deck plate in machinery spaces lined with asbestos-lagged piping, ductwork, and equipment
• Hull steel + framing — cutting and welding hull plate in dry dock adjacent to asbestos-cement bulkhead panels
• Superstructure erection — welding and bolting up superstructure steel around asbestos-marine-panel deck compartments and asbestos-lagged uptakes

The shipyard structural iron worker allegedly experienced concentrated exposure to asbestos-marine-panels and asbestos-lagged pipe and duct systems in confined, poorly-ventilated shipboard spaces.

Nuclear power plant construction

The commercial nuclear fleet — General Electric BWRs and Westinghouse, Babcock & Wilcox, and Combustion Engineering PWRs — was built during the peak asbestos era. IW members allegedly:

• Erected containment structural steel — the internal steel framing inside the reactor containment building
• Placed and tied reactor shield structural rebar — heavy rebar mats in reactor cavity walls, biological shield walls, and containment base slabs
• Erected turbine building structural steel — inside the sprayed asbestos fireproofing envelope on many first-generation plants
• Set reactor building crane girders and support steel — adjacent to asbestos-insulated primary system components

Industrial-plant rebar + reinforcing installation

Reinforcing iron workers (“rod-busters”) allegedly placed and tied rebar in every category of industrial-plant cast-in-place concrete work: heater and furnace foundations, storage tank ring-wall foundations, containment pads for asbestos-lagged process equipment, and slab-on-grade pours across process areas where sprayed fireproofing overspray had settled onto the rebar mat before the pour.

Precast erection — asbestos-cement panels + siding

Precast erector iron workers allegedly set:

• Asbestos-cement wall panels on industrial buildings, cooling tower enclosures, and process structures — CertainTeed, Johns-Manville, and Nicolet asbestos-cement panels
• Asbestos-cement siding shingles on commercial and industrial exteriors — Bird Incorporated and competing suppliers
• Precast concrete tees, double-tees, and hollow-core plank in commercial construction, some categories of which allegedly contained asbestos content in the era
• Asbestos-cement corrugated roofing sheet on industrial buildings, warehouses, and agricultural process buildings

Industrial rigging + machinery moving

Iron worker riggers and machinery movers allegedly rigged, hoisted, and set into place asbestos-lagged industrial equipment — asbestos-covered boilers, asbestos-lagged turbines, asbestos-insulated fired heaters, and asbestos-jacketed process vessels — during initial plant construction and during rebuild campaigns. Rigging work adjacent to asbestos-lagged equipment during placement, alignment, and grouting allegedly produced substantial career-long exposure to asbestos insulation, block, and jacketing materials.

Power plant construction (fossil)

Coal-fired, oil-fired, and gas-fired utility and industrial powerhouses required IW members for boiler support steel, turbine deck structural framing, powerhouse structural steel, cooling tower structural framing, and stack + duct structural framing — all typically allegedly coated with sprayed asbestos fireproofing per the era’s code requirements and adjacent to asbestos-lagged boiler externals, asbestos-insulated main steam and hot reheat piping, and asbestos-covered feedwater and condensate piping.

Institutional + government building construction

Every major hospital tower, university academic and residence-hall high-rise, courthouse, federal office building, state office building, and municipal civic center built between the mid-1950s and 1973 allegedly had structural steel coated in sprayed asbestos fireproofing during construction. IW members erected the structural skeleton on every one of these buildings, inside the same spray cloud that defined the commercial high-rise category.

State-by-state jobsite documentation

For specific facility-level documentation across the states in the Industrial Exposure Archive network:

State-specific jobsite catalogs are also linked directly from within each Local page on this site. For any other state, see the Industrial Exposure Archive cross-state hub.

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