Zonolite Spra-Insulation

Product Description

Zonolite Spra-Insulation was a spray-applied thermal and acoustical insulation product manufactured by W.R. Grace & Co. under its Zonolite division. Produced between approximately 1960 and 1972, the product was designed for application to structural steel, concrete decking, ceilings, and interior surfaces in commercial, industrial, and institutional construction projects. Like other spray-applied building materials of its era, Zonolite Spra-Insulation was marketed primarily on the basis of its thermal performance, fire-resistive properties, and ease of application across large surface areas.

W.R. Grace was one of the dominant manufacturers in the spray-applied insulation and fireproofing market during the 1960s and early 1970s. The company’s Zonolite product line spanned a broad range of construction materials, with Spra-Insulation representing one of several formulations intended for direct spray application in newly constructed buildings. The product was sold and installed throughout the United States during the period of its production, appearing in a wide variety of building types including warehouses, office buildings, schools, and manufacturing facilities.

Production of Zonolite Spra-Insulation ceased in 1972, a period that roughly coincides with growing regulatory and scientific scrutiny of asbestos-containing construction materials. The U.S. Environmental Protection Agency moved to restrict and eventually ban spray-applied asbestos-containing materials through regulatory actions that gained momentum in the early 1970s, contributing to the withdrawal of products in this category from the commercial market.

Asbestos Content

Zonolite Spra-Insulation contained chrysotile asbestos as a component of its formulated mixture. Chrysotile, sometimes referred to as white asbestos, is a serpentine-form asbestos fiber that was the most widely used variety in commercial building products throughout the twentieth century. Although chrysotile differs structurally from the amphibole asbestos varieties—such as amosite and crocidolite—regulatory agencies and health authorities including the World Health Organization, the International Agency for Research on Cancer, and the U.S. National Toxicology Program have classified chrysotile as a known human carcinogen capable of causing mesothelioma, lung cancer, and asbestosis.

W.R. Grace incorporated asbestos into spray-applied products during this period to improve fiber reinforcement, binding characteristics, and fire-resistance performance. In the context of spray insulation products, asbestos fibers were typically mixed with other materials such as mineral wool or vermiculite-based binders to create the final spray formulation. The resulting installed product, once dried and adhered to a surface, retained asbestos fibers that could become airborne when the material was disturbed, damaged, or removed.

Litigation records document that W.R. Grace possessed internal knowledge concerning the health hazards associated with asbestos-containing products during the years Zonolite Spra-Insulation was manufactured and distributed.

How Workers Were Exposed

The primary pathway of occupational asbestos exposure associated with Zonolite Spra-Insulation was inhalation of airborne asbestos fibers released during the product’s application, finishing, and subsequent disturbance. Industrial workers and construction tradespeople who worked in proximity to spray-applied insulation operations faced significant exposure risk, particularly in enclosed or poorly ventilated spaces where fiber concentrations could accumulate.

During application, the spraying process aerosolized the product mixture, dispersing fine particles—including respirable asbestos fibers—into the surrounding work environment. Workers operating spray equipment were directly exposed, but bystander exposure was also documented among workers in adjacent trades who were present in the same work area during or after application. Drywall finishers, electricians, pipefitters, ironworkers, painters, and other construction tradespeople often worked in spaces where spray-applied insulation had recently been applied or was actively being installed.

Beyond initial installation, Zonolite Spra-Insulation posed ongoing exposure risks in industrial and commercial facilities where the installed product could be disturbed during renovation, maintenance, or demolition activities. Industrial workers engaged in facility upkeep, overhead work, or equipment installation in buildings containing spray-applied asbestos insulation faced continued exposure risks long after the original installation was complete. Friable spray-applied asbestos materials—those that can be crumbled by hand pressure—are among the most hazardous asbestos-containing building products because they readily release fibers when contacted, vibrated, or disturbed by air movement.

OSHA’s current permissible exposure limit for asbestos is 0.1 fibers per cubic centimeter of air as an eight-hour time-weighted average, a standard that did not exist or was not enforced during the years when workers were routinely exposed to Zonolite Spra-Insulation during installation and building operations.

Zonolite Spra-Insulation is classified as a Tier 2 product for purposes of legal remedy, meaning that claims arising from exposure to this product proceed through civil litigation rather than through an established asbestos bankruptcy trust fund. W.R. Grace did file for Chapter 11 bankruptcy protection in 2001 and subsequently emerged from bankruptcy in 2014 following the establishment of the WRG Asbestos PI Trust. However, eligibility for recovery through the WRG Asbestos PI Trust is governed by specific trust distribution procedures, and individuals with potential claims should consult with qualified asbestos litigation counsel to evaluate their specific eligibility based on documented exposure history and applicable medical criteria.

Litigation records document that plaintiffs have alleged W.R. Grace knew of the health hazards associated with asbestos-containing spray insulation products and failed to provide adequate warnings to workers and end users. Plaintiffs alleged that W.R. Grace continued to manufacture, market, and sell products containing chrysotile asbestos despite possessing internal documentation concerning fiber release during application and the associated disease risks to exposed workers.

Individuals who were diagnosed with mesothelioma, lung cancer, asbestosis, or other asbestos-related diseases following occupational exposure to Zonolite Spra-Insulation may have legal remedies available to them. Relevant legal options can include:

  • Direct litigation against W.R. Grace or successor entities, subject to applicable statutes of limitations and bankruptcy trust procedures
  • Claims through the WRG Asbestos PI Trust, for eligible claimants meeting trust distribution procedure requirements
  • Third-party claims against building owners, general contractors, or other entities responsible for the use or maintenance of asbestos-containing spray insulation in facilities where exposure occurred
  • Workers’ compensation claims in jurisdictions where occupational asbestos disease is compensable through state workers’ compensation systems

The statute of limitations for asbestos-related claims varies by state and typically begins to run from the date of diagnosis rather than the date of exposure—a legal doctrine known as the discovery rule. Because mesothelioma and other asbestos-related diseases typically have latency periods ranging from ten to fifty years, individuals diagnosed decades after their workplace exposures may still fall within the applicable filing window.

Anyone who worked with or around Zonolite Spra-Insulation during its production period—or who worked in buildings where the material was installed—and who has received a diagnosis of an asbestos-related disease is encouraged to consult an attorney experienced in asbestos litigation to evaluate the full scope of available remedies.