Asbestos Cement Siding (1930–1978) — GAF Corporation

Product Description

Asbestos cement siding was a widely used exterior building material manufactured and sold throughout the United States from the early 1930s through the late 1970s. GAF Corporation was among the prominent manufacturers producing this product during its peak years of commercial and residential construction. Sold under various trade names and marketed as a durable, fire-resistant alternative to traditional wood siding, asbestos cement panels were installed on millions of homes, schools, commercial buildings, and industrial facilities across the country.

The material was prized by builders and property owners for several practical reasons. It was dimensionally stable, resistant to moisture and rot, and required relatively little maintenance compared to painted wood exteriors. Its fire-resistant properties made it an attractive choice for densely built neighborhoods and industrial campuses where fire spread posed a significant risk. These characteristics, combined with low production costs, drove widespread adoption of the product throughout mid-century American construction.

GAF Corporation’s involvement in asbestos-containing building materials extended across multiple product categories. The company produced roofing materials, floor tile, and pipe-covering products in addition to exterior siding panels, establishing it as a major participant in the broader asbestos-containing construction materials market. Asbestos cement siding specifically was produced continuously from the 1930s until regulatory pressure and growing awareness of asbestos hazards led manufacturers to phase out asbestos-containing formulations. The Toxic Substances Control Act of 1976 and subsequent EPA regulatory actions contributed to the industry-wide transition away from asbestos-containing products, with GAF Corporation’s production of asbestos cement siding ceasing by approximately 1978.

Asbestos Content

Asbestos cement siding panels manufactured by GAF Corporation during the production period contained chrysotile asbestos fibers as a primary reinforcing component. In asbestos cement construction products of this era, asbestos fibers were combined with Portland cement and water under high-pressure forming processes to create dense, rigid panels. Chrysotile, the most commercially prevalent asbestos fiber type, was the dominant variety used in these formulations, though other asbestos fiber types were sometimes incorporated depending on manufacturing specifications.

The asbestos content in cement siding products varied by formulation and production period but was typically substantial, often representing a significant percentage of the panel’s total composition by weight. This high fiber loading was functionally necessary: the asbestos fibers provided tensile strength and flexibility to what would otherwise be a brittle cement matrix, allowing the panels to be cut, nailed, and handled on construction sites without excessive breakage.

AHERA (the Asbestos Hazard Emergency Response Act) and subsequent federal regulatory frameworks identified asbestos cement siding as a category of asbestos-containing material requiring specific management and abatement protocols when found in buildings subject to inspection. Under current regulatory guidance from OSHA and the EPA, disturbance of intact asbestos cement siding — through cutting, grinding, drilling, or demolition — is considered a significant exposure risk and must be managed in accordance with applicable federal and state asbestos regulations.

How Workers Were Exposed

Industrial workers and construction trades personnel faced meaningful asbestos exposure at multiple points in the lifecycle of asbestos cement siding manufactured by GAF Corporation. Exposure occurred during manufacturing, during product installation, and during later renovation, repair, and demolition work performed on structures where the siding had been installed.

Manufacturing workers employed at facilities producing asbestos cement siding were exposed to raw asbestos fiber during mixing and forming operations. The process of combining loose asbestos fiber with cement under industrial conditions generated substantial quantities of airborne dust, and workers in these environments experienced direct, repeated exposure before modern respiratory protections were widely mandated or enforced.

Construction and installation workers — including carpenters, siding installers, and general laborers on residential and commercial job sites — were exposed when cutting asbestos cement panels to fit building dimensions. Cutting these panels with hand saws, circular saws, or other power tools generated clouds of fine asbestos-containing dust that workers inhaled in the immediate work area. Because the hazards of asbestos were not widely communicated to workers during much of the production period, respiratory protection was rarely used during these tasks.

Renovation and demolition workers faced ongoing exposure hazards long after original installation. Workers performing re-siding projects, building rehabilitation, or demolition on structures clad with asbestos cement siding disturbed the material and released fibers — particularly when using power tools, applying pressure to panels, or breaking material during removal. OSHA’s asbestos standards document that friable and damaged asbestos-containing materials present elevated fiber release risks, and renovation and demolition scenarios represent some of the highest-exposure situations for workers in the construction trades.

Industrial workers in maintenance and facilities management roles at plants, warehouses, and commercial facilities sided with these products similarly faced incidental but repeated exposure during routine maintenance activities over many years.

Trust Fund: GAF Corporation Asbestos Settlement Trust

Individuals diagnosed with asbestos-related diseases who were exposed to asbestos cement siding or other asbestos-containing products manufactured by GAF Corporation may be eligible to file a claim with the GAF Corporation Asbestos Settlement Trust. This trust was established through GAF Corporation’s asbestos bankruptcy proceedings as a mechanism for compensating individuals harmed by exposure to the company’s asbestos-containing products. Trust funds of this type are a standard legal remedy created under Section 524(g) of the U.S. Bankruptcy Code specifically to ensure that present and future asbestos claimants have access to compensation.

Filing Eligibility

Claimants must generally demonstrate:

  • Product exposure — documented or credibly asserted contact with GAF Corporation asbestos-containing products, including asbestos cement siding, roofing materials, floor tile, or pipe-covering products
  • Occupational or environmental nexus — evidence placing the claimant at a worksite, residence, or facility where GAF products were present during the exposure period (1930–1978)
  • Qualifying diagnosis — a medical diagnosis of an asbestos-related disease recognized under the trust’s claims matrix

Qualifying Claim Categories

The GAF Corporation Asbestos Settlement Trust recognizes claim categories consistent with standard asbestos trust fund disease matrices, which typically include:

  • Mesothelioma (malignant, pleural or peritoneal)
  • Lung cancer (with documented asbestos exposure history)
  • Other cancers associated with asbestos exposure (laryngeal, esophageal, and other qualifying sites)
  • Asbestosis and severe asbestosis
  • Other non-malignant conditions including pleural disease meeting defined severity thresholds

Next Steps

Individuals with a qualifying diagnosis and documented exposure history involving GAF Corporation products should consult an attorney experienced in asbestos trust fund litigation. Claim filing deadlines, exposure documentation requirements, and disease severity criteria are governed by the trust’s Trust Distribution Procedures (TDP). An attorney can evaluate occupational history, identify all applicable trusts — claimants exposed to multiple manufacturers’ products may have claims against multiple funds — and manage the filing process on the claimant’s behalf. There is no cost to the claimant to pursue a trust fund claim through a contingency-fee asbestos attorney.