Siding Shingles — United States Gypsum Company

Product Description

Siding shingles were a widely used exterior building material throughout much of the twentieth century, prized for their durability, fire resistance, and low maintenance requirements. Unlike traditional wood shingles, which required periodic painting and were vulnerable to rot and insect damage, fiber-reinforced shingle products were marketed as a long-lasting alternative suited to residential, commercial, and industrial construction alike.

United States Gypsum Company, commonly known as USG, was a major manufacturer of construction materials whose product lines extended well beyond the gypsum wallboard and joint compound products most associated with the brand. USG produced a range of building products — including ceiling tiles, pipe insulation components, and joint compounds — and litigation records document the company’s involvement in the manufacture and distribution of asbestos-containing siding shingles sold into the American construction market. These shingles were installed on homes, factory buildings, schools, and other structures across the country, particularly during the post-World War II building boom when demand for economical, durable exterior cladding was at its peak.

As with many asbestos-containing building products of the era, siding shingles were not exclusively associated with new construction. They were also marketed as a re-siding material, meaning that installation over existing siding surfaces was common practice. This extended the reach of the product into renovation and remodeling trades as well as original construction work.

Asbestos Content

Asbestos fibers — most commonly chrysotile, and in some formulations amphibole varieties such as amosite — were incorporated into siding shingles as a reinforcing and binding agent. The mineral’s tensile strength, resistance to heat, and compatibility with cement-based matrices made it an attractive additive for manufacturers seeking to produce a shingle that would resist cracking, weathering, and fire exposure over decades of outdoor use.

In asbestos-cement shingles, the manufacturing process typically involved mixing asbestos fibers with Portland cement slurry, pressing the mixture into molds or running it through sheet-forming equipment, and then curing the resulting panels under controlled conditions. The finished shingles were dense, rigid, and dimensionally stable — qualities that made them appealing to builders and contractors who needed a predictable, low-maintenance cladding product.

Plaintiffs in litigation involving USG siding shingles alleged that the asbestos content of these products was sufficient to generate hazardous fiber releases during normal handling, cutting, and installation activities, as well as during later disturbance events such as renovation, repair, or demolition work. The Asbestos Hazard Emergency Response Act (AHERA) regulatory framework established by the U.S. Environmental Protection Agency recognizes asbestos-cement products, including siding, as a category of asbestos-containing material (ACM) subject to specific management and abatement requirements when found in regulated structures.

How Workers Were Exposed

Industrial workers and tradespeople encountered USG siding shingles at multiple points in the product lifecycle, and litigation records document exposure claims arising from a range of occupational settings.

Installation and construction workers faced exposure during original application of the shingles. Cutting shingles to fit around windows, doors, corners, and other architectural features was a routine part of installation work. Whether cut with hand snips, circular saws, or scoring tools, this process generated dust and debris containing asbestos fibers. Workers who cut, nailed, and fitted shingles in enclosed or poorly ventilated areas — such as under roof overhangs or in close proximity to building walls — could accumulate significant airborne fiber exposures over the course of a working day.

Re-siding and renovation workers encountered a different but equally significant exposure scenario. Installing new siding over old asbestos-cement shingles required nailing through the existing layer, which could fracture the brittle material and release fibers. In cases where old shingles were removed entirely before new cladding was applied, the demolition and disposal work involved breaking, prying, and hauling damaged shingle material — activities that plaintiffs alleged generated substantial fiber releases.

Industrial workers generally, including those employed at manufacturing facilities, warehouses, and large-scale industrial plants where USG products were stocked, applied, or removed, are documented in litigation records as having been exposed to asbestos-containing siding shingles in the course of ordinary work activities. Maintenance personnel who performed repairs to building exteriors, plant workers tasked with facility upkeep, and laborers involved in industrial construction and demolition projects all potentially encountered these products.

Demolition workers and salvage laborers faced exposure when structures clad in asbestos-cement shingles were torn down. The mechanical forces involved in demolition — swinging hammers, operating equipment, and manually stripping exterior cladding — could shatter the brittle shingle panels and release clouds of asbestos-laden dust into the air.

OSHA’s asbestos standards for construction and general industry set permissible exposure limits (PEL) for airborne asbestos fibers and require protective measures when asbestos-containing materials are disturbed. These regulatory frameworks reflect decades of documented evidence that disturbing intact and friable asbestos-containing building products poses a measurable health risk to workers.

Diseases associated with occupational asbestos exposure — including mesothelioma, asbestosis, and lung cancer — have been diagnosed among workers in the trades described above, and litigation records document claims by industrial workers and construction tradespeople who alleged that their illness was caused or contributed to by exposure to asbestos-containing products including siding shingles.

United States Gypsum Company has been a defendant in asbestos personal injury litigation, and litigation records document claims brought by workers alleging exposure to USG asbestos-containing products, including siding shingles. Plaintiffs alleged that USG knew or should have known of the hazards associated with asbestos-containing products and failed to adequately warn workers and end users of those risks.

For individuals diagnosed with mesothelioma, asbestosis, lung cancer, or other asbestos-related diseases who have a documented history of occupational exposure to USG siding shingles or related products, the following legal avenues may be relevant:

  • Asbestos personal injury litigation: Claims may be pursued in civil court against manufacturers and distributors where a plaintiff can document product-specific exposure. Litigation records show that USG has faced such claims in connection with its asbestos-containing building product lines.

  • Workers’ compensation: Depending on the jurisdiction and the circumstances of exposure, workers’ compensation claims may be available to individuals who developed asbestos-related disease in the course of employment.

  • Consultation with an asbestos attorney: Because asbestos litigation involves complex questions of product identification, exposure documentation, and statute of limitations, individuals considering a claim are strongly encouraged to consult with legal counsel experienced in asbestos personal injury cases.

Individuals who believe they were exposed to asbestos-containing USG siding shingles — whether as construction workers, industrial workers, or in other capacities — should preserve any available records of employment, product use, and medical diagnosis, as this documentation forms the evidentiary foundation of any legal claim.

This article is provided for informational reference purposes only and does not constitute legal advice.