Mesothelioma Lawyer Missouri: Asbestos Exposure at the John Hancock Center, Chicago — A Guide for Workers, Families, and Former Employees

If You Were Just Diagnosed, Read This First

A mesothelioma diagnosis after working at the John Hancock Center is not a coincidence. The building was constructed between 1965 and 1969 — the peak era of asbestos use in American high-rise construction — and the trades that built and maintained it faced some of the highest occupational fiber exposures ever documented. Under Missouri law, you have five years from the date of diagnosis to file a personal injury claim. That deadline is not flexible. If you wait, you lose the right to sue — permanently.

Call an experienced Missouri asbestos attorney before you do anything else.

Urgent Filing Deadline

Missouri imposes a 5-year statute of limitations on asbestos personal injury claims, running from the date of diagnosis. Separate deadlines apply to wrongful death claims. Missing either deadline extinguishes your claim entirely. No exception, no extension.

Missouri courts also have procedures that affect how asbestos trust fund claims interact with litigation. An experienced asbestos attorney Missouri can sequence your claims correctly and ensure nothing is forfeited through procedural error.

The John Hancock Center: What Workers Need to Know

The John Hancock Center — officially rebranded 875 North Michigan Avenue in 2018 — is one of Chicago’s defining structures. For the ironworkers, insulators, pipefitters, boilermakers, electricians, and maintenance staff who built and worked in it, the building carries a different history: potential exposure to asbestos-containing materials that may not produce symptoms for 20 to 50 years.

If you worked at the John Hancock Center during construction (1965–1969), during later renovations, or in ongoing mechanical operations — and you or a family member has been diagnosed with mesothelioma, asbestosis, pleural disease, or asbestos-related lung cancer — you may have legal claims with strict filing deadlines.

An asbestos cancer lawyer can evaluate your specific work history and exposure circumstances to determine your legal options.

Building Overview

The John Hancock Center was developed by John Hancock Mutual Life Insurance Company and designed by Skidmore, Owings & Merrill (SOM). Architect Bruce Graham and structural engineer Fazlur Rahman Khan designed a 100-story, 1,128-foot mixed-use tower with:

X-braced steel exterior (tubular truss system)
Approximately 2.8 million square feet of office, residential, retail, and mechanical space
44 residential condominium floors (stories 44–92)
28 office floors (stories 13–41)
Mechanical equipment rooms distributed across multiple building levels
Complex HVAC, plumbing, electrical, and fire suppression systems

Construction Timeline

Phase	Timeline	Activity
Site Preparation	1965	Demolition of prior structures; foundation work
Steel Erection	1966–1968	Structural frame assembly and fireproofing application
Topping Out	1968	Structural completion of all 100 stories
Occupancy	1969–1970	Partial opening 1969; full occupancy 1970
Later Renovations	1980s–2000s	Tenant improvements, mechanical upgrades, abatement work
Name Change	2018	Rebranded as 875 North Michigan Avenue

Why Asbestos-Containing Materials Were Used in 1960s High-Rise Construction

Standard Practice — Not an Aberration

In the 1960s, asbestos-containing materials were not a workaround or a cheap substitute. They were the specified, code-compliant solution for high-rise construction. Manufacturers including Johns-Manville, Owens-Illinois, Armstrong World Industries, and W.R. Grace aggressively marketed these products because they delivered genuine engineering advantages:

Fire resistance: asbestos fibers do not burn, making them the dominant choice for fireproofing structural steel
Thermal insulation on pipes, ducts, boilers, and mechanical equipment
Acoustic dampening in large open floor plates
Chemical and moisture resistance in HVAC systems
Low cost and rapid installation
Compliance with Chicago fire ordinances requiring fireproofing of steel-frame buildings

The Fireproofing Mandate

The Chicago Municipal Code required that structural steel be fireproofed. Steel loses load-bearing capacity rapidly at elevated temperatures, making fireproofing both a legal mandate and an engineering necessity.

The standard method in 1960s Chicago high-rises was sprayed-on asbestos-containing fireproofing — a mixture of asbestos fibers (predominantly amosite or chrysotile) bound with asbestos-containing cement, sprayed directly onto steel beams, columns, and floor decking. Products manufactured by Johns-Manville and Owens-Illinois were reportedly used in comparable Chicago-era high-rises during this period.

The Broader Chicago Context

The John Hancock Center was one of several major Chicago high-rises built during the mid-1960s through early 1970s, all of which may have incorporated asbestos-containing materials:

The Daley Center (completed 1965)
Marina City (completed 1968)
The IBM Building (completed 1971)
The Sears Tower/Willis Tower (completed 1973)

Litigation records from other Chicago-area high-rise construction projects document the asbestos-containing products, manufacturers — including Johns-Manville, Owens-Illinois, Armstrong World Industries, Crane Co., and Combustion Engineering — and installation methods used during this era. That evidence directly informs what may have been present at the John Hancock Center.

Where Asbestos-Containing Materials Were Reportedly Located

Structural Fireproofing

Sprayed-on asbestos-containing fireproofing was reportedly applied to steel beams, columns, and decking throughout the structure. Likely manufacturers include Johns-Manville, Owens-Illinois, Armstrong World Industries, and Combustion Engineering — all active in Chicago construction fireproofing during the mid-1960s.

Mechanical Systems (Across All 100 Floors)

Asbestos-containing pipe insulation (block, blanket, and pre-formed pipe covering) reportedly present on hot water, steam, and chilled water piping — potentially including Kaylo and Thermobestos brand products
Asbestos-containing duct insulation on HVAC ducts and plenums — potentially including Aircell and Monokote products
Asbestos-containing boiler block insulation on central boiler systems
Asbestos-containing refractory and insulating materials inside boiler fireboxes and combustion chambers
Asbestos-containing gaskets, packing materials, and fittings in valves, pumps, and mechanical connections

Equipment and Building Systems

Asbestos-containing electrical insulation on wire and cable used in high-heat applications — potentially including Unibestos product lines
Asbestos-containing arc chutes and insulation in circuit breakers and electrical switchgear — potentially from Crane Co. electrical components
Asbestos-containing ceiling tiles and wall panels in certain construction phases — potentially including Gold Bond and Georgia-Pacific products
Asbestos rope and gasket materials in access doors, manways, and pipe connections — potentially from Garlock Sealing Technologies and Eagle-Picher

Later Renovations and Maintenance Work

Post-1969 tenant improvement projects, mechanical upgrades, and routine maintenance may have allegedly involved additional asbestos-containing materials. Celotex, W.R. Grace, and Georgia-Pacific products were reportedly used in renovation work at comparable Chicago buildings during the 1980s–2000s, creating potential exposure for workers who never touched the original construction.

Who May Have Been Exposed: Trades and Occupations at Risk

Heat and Frost Insulators (HFIAW)

Insulators rank among the most heavily exposed trade groups in asbestos litigation — and for good reason. At the John Hancock Center, insulators may have:

Mixed and applied asbestos-containing pipe insulation — products such as Kaylo and Thermobestos — across thousands of linear feet of piping on all 100 floors
Applied asbestos-containing duct insulation — products such as Aircell and Monokote — to HVAC systems throughout the building
Installed asbestos-containing block insulation on boilers and large mechanical equipment
Cut, sanded, and fitted pre-formed asbestos-containing insulation sections around complex pipe configurations
Applied asbestos-containing cement to joints and fittings

Members of Heat and Frost Insulators Local 1 (St. Louis) and Heat and Frost Insulators Local 27 (Kansas City) may have worked at this facility during construction and subsequent renovation phases.

Cutting block insulation, hand-mixing asbestos-containing cement, and applying wet asbestos-containing materials generate high airborne fiber concentrations — often far above the thresholds that occupational health standards now recognize as dangerous.

Pipefitters and Plumbers

Pipefitters worked alongside insulators and independently disturbed asbestos-containing materials. Potential exposures include:

Proximity to insulators applying asbestos-containing pipe covering such as Kaylo and Thermobestos
Cutting, threading, and fitting pipe runs adjacent to or destined for asbestos-containing insulation
Disturbing pre-existing asbestos-containing pipe insulation during repair or modification work
Handling asbestos-containing gaskets — potentially manufactured by Garlock Sealing Technologies or Eagle-Picher — at flanged connections throughout mechanical systems
Working with asbestos-containing packing in valve stems and pump seals

Members of Plumbers and Pipefitters UA Local 562 (St. Louis) and Plumbers and Pipefitters UA Local 268 (Kansas City) may have worked at this facility.

Pipefitters assigned to the building’s mechanical equipment rooms faced sustained potential exposure: dense concentrations of insulated piping in enclosed spaces created conditions where fiber levels could remain elevated throughout a full work shift.

Boilermakers

Boilermakers who installed, maintained, or repaired the building’s boiler systems may have been exposed to:

Asbestos-containing boiler block insulation on boiler exteriors
Asbestos-containing refractory materials in fireboxes and combustion chambers
Asbestos rope and gasket materials — potentially from Garlock Sealing Technologies — in boiler access doors and manways
Sprayed asbestos-containing fireproofing in mechanical spaces where boiler work was performed
Asbestos-containing insulation on steam piping directly connected to boiler systems

Boilermaker work frequently required entry into enclosed spaces with limited ventilation. Airborne fiber concentrations in those conditions may have exceeded those in open construction areas.

Electricians

Electricians have multiple documented asbestos exposure pathways that litigation records show are frequently overlooked:

Asbestos-containing electrical insulation — potentially including Unibestos product lines — on wire and cable in high-heat applications
Asbestos-containing components in circuit breakers and switchgear, including arc chutes and interior insulation — potentially from Crane Co.
Pulling wire through cable trays and conduit in close proximity to insulated piping
Working in electrical rooms where asbestos-containing fireproofing was applied to structural steel
Installing equipment in areas where other trades had recently disturbed asbestos-containing materials

Carpenters and Laborers

Construction workers in support roles faced exposures that litigation records consistently show are underestimated:

Removing formwork and temporary supports after concrete placement, potentially disturbing asbestos-containing fireproofing
Performing demolition in subsequent renovation projects that disturbed asbestos-containing materials already in place
Moving materials and equipment through construction zones where asbestos-containing dust had settled
Bystander exposure in areas where insulators, pipefitters, boilermakers, or electricians were actively working with asbestos-containing products

Bystander exposure is legally compensable. You do not have to have directly handled asbestos-containing materials to bring a claim.

Building Operators and Maintenance Staff

Post-construction exposure continued for decades after 1969: