Structolite Plaster (United States Gypsum)

Product Description

Structolite Plaster is a perlite-aggregate base coat plaster manufactured by United States Gypsum Company (USG), one of the largest gypsum and wallboard producers in North America. Designed as a lightweight, fast-setting base coat for interior plastering applications, Structolite was widely used in commercial construction, industrial facilities, and institutional buildings throughout the mid-to-late twentieth century. Its perlite aggregate composition made it a preferred material for plasterers seeking a product that provided good adhesion, reduced weight on wall and ceiling assemblies, and a workable consistency for hand and machine application.

Structolite Plaster was applied as an undercoat over masonry, metal lath, and gypsum lath surfaces before the application of finish plasters. Its use spanned a broad range of construction environments, including schools, hospitals, office buildings, and industrial plants. Because of its widespread use in large-scale commercial and industrial construction, many workers across multiple trades encountered the product repeatedly over the course of their careers.

USG marketed Structolite under the broader umbrella of its professional plastering product lines, and the product remained available through plastering supply distributors for decades. The longevity of its production and sale means that exposure histories can span workers active from the 1950s through at least the 1980s, when regulatory scrutiny of asbestos-containing construction materials intensified significantly.

Asbestos Content

Litigation records document that Structolite Plaster, during certain periods of its manufacture and distribution, contained asbestos as a component of its formulation. Plaintiffs in asbestos personal injury litigation have alleged that United States Gypsum incorporated asbestos-containing materials into Structolite and other plaster products, and that the company knew or should have known of the health hazards associated with asbestos exposure during the relevant production years.

The specific percentage of asbestos content and the precise years during which asbestos was included in Structolite’s formulation have been subjects of litigation and product identification proceedings. Plaintiffs alleged that asbestos fibers were present in the product in quantities sufficient to become airborne during normal mixing, application, sanding, and demolition activities, creating an inhalation hazard for workers who handled the product on a regular basis.

Because Structolite was sold and distributed under a consistent brand name over many years, product identification in litigation has generally relied on work history records, co-worker testimony, job site documentation, and historical product specification sheets. Industrial hygiene evidence presented in litigation has documented that dry plaster mixing and finishing operations can generate respirable dust containing asbestos fibers when the underlying product formulation includes asbestos.

How Workers Were Exposed

Exposure to asbestos in Structolite Plaster is documented in litigation records as occurring primarily through inhalation of dust generated during the product’s mixing, application, finishing, and removal. The following work activities have been identified in litigation as presenting significant exposure potential:

Mixing and Preparation: Structolite Plaster was supplied as a dry powder requiring on-site mixing with water. Workers who opened bags of dry plaster and mixed the product were exposed to airborne dust generated during the pouring and agitation process. In enclosed or poorly ventilated spaces, dust concentrations could remain elevated for extended periods.

Application and Troweling: Plasterers who hand-applied or machine-applied Structolite to wall and ceiling surfaces generated dust and aerosol during the spreading and leveling process. Extended, repeated application work over the course of a career represented a cumulative exposure pathway recognized in industrial hygiene literature.

Sanding and Finishing: After the base coat cured, workers who sanded or abraded the surface to prepare it for finish coats generated fine respirable dust. Sanding operations are well-documented in asbestos litigation as among the highest-exposure activities associated with plaster and joint compound products.

Demolition and Renovation: Workers involved in the removal of plaster from older structures — including demolition laborers, renovation contractors, and maintenance personnel — disturbed cured plaster material in ways that could release previously bound fibers. AHERA and OSHA standards recognize the disturbance of asbestos-containing building materials during renovation and demolition as a significant exposure event.

Bystander and Adjacent Trade Exposure: Litigation records document that workers in trades adjacent to plastering operations — including electricians, pipefitters, carpenters, and general laborers working in the same areas — may have inhaled airborne dust generated by plastering activities without directly handling the product themselves. Industrial workers generally, including maintenance and facilities workers in industrial plants where Structolite was used in building construction, have been identified in litigation as an exposed population.

Asbestos-related diseases associated with this type of exposure include mesothelioma, asbestosis, lung cancer, and other asbestos-related conditions. These diseases typically have latency periods of 20 to 50 years from initial exposure to clinical diagnosis, meaning workers exposed to Structolite during the mid-twentieth century may be receiving diagnoses today.

Documented Trust Fund / Legal Options

Structolite Plaster litigation is classified as a Tier 2 litigated product, meaning that claims involving this product are pursued through the civil tort system rather than through a pre-established asbestos bankruptcy trust fund. United States Gypsum has been a defendant in asbestos personal injury litigation, and plaintiffs alleging injury from exposure to Structolite Plaster or other USG asbestos-containing products have pursued claims in state and federal courts.

Civil Litigation: Individuals diagnosed with mesothelioma, lung cancer, asbestosis, or other asbestos-related conditions who can document occupational exposure to Structolite Plaster may be eligible to file personal injury claims. Litigation records document settlements and verdicts involving USG asbestos-containing plaster products. Surviving family members of deceased workers may pursue wrongful death claims under applicable state law.

Additional Defendant Claims: Because Structolite Plaster was used in conjunction with other asbestos-containing products on the same job sites — including pipe insulation, ceiling tiles, joint compounds, and other building materials — individuals with qualifying diagnoses may have viable claims against multiple defendants, including manufacturers of those other products, some of which have established bankruptcy trusts. An experienced asbestos attorney can evaluate the full exposure history to identify all potentially liable parties.

Statute of Limitations: Asbestos personal injury and wrongful death claims are subject to statutes of limitations that vary by state. The limitations period typically begins running from the date of diagnosis or the date the plaintiff knew or should have known of the connection between their illness and asbestos exposure. Consulting with qualified legal counsel promptly after diagnosis is strongly recommended to preserve legal rights.

Legal Consultation: Workers and family members who believe exposure to Structolite Plaster contributed to an asbestos-related diagnosis should contact an attorney with documented experience in asbestos litigation. Attorneys handling these cases typically work on a contingency fee basis, meaning no upfront legal fees are required.