Washington Naval Treaty

The Washington Naval Treaty was a 1922 arms-limitation agreement among the United States, United Kingdom, Japan, France, and Italy that capped the size and tonnage of warships following World War I. To stay within these limits while still building powerful vessels, navies turned heavily to lightweight, fire-resistant materials, most importantly asbestos, for insulation throughout ship interiors, engine rooms, and boiler spaces. The treaty therefore helped drive a dramatic expansion of asbestos use in naval shipbuilding during the interwar period and beyond.

Origin

Signed on February 6, 1922, at the Washington Naval Conference convened by U.S. Secretary of State Charles Evans Hughes, the treaty was the first major modern disarmament agreement. It set a 5:5:3 ratio of capital ship tonnage among the U.S., U.K., and Japan and limited individual ship displacement, pressuring naval architects to economize on weight wherever possible.

Significance in Asbestos Context

For veterans and shipyard workers diagnosed with mesothelioma, lung cancer, or asbestosis, the treaty is part of the historical backdrop explaining why Navy ships of the 1920s through the 1970s were saturated with asbestos. Weight restrictions pushed designers toward asbestos-containing insulation, gaskets, packing, and fireproofing in boilers, turbines, steam lines, and bulkheads, exactly the materials sailors, machinist's mates, boiler tenders, pipefitters, and shipyard workers handled or breathed dust from daily. Documenting service aboard treaty-era and successor classes of ships, or work in Navy shipyards that built and overhauled them, can be central to establishing exposure history in a VA claim or civil lawsuit against the manufacturers who supplied those insulation and equipment products.

Example Sentence

The expert report traced the heavy use of amosite and chrysotile insulation aboard the client's cruiser back to design constraints rooted in the Washington Naval Treaty's tonnage limits.

Related Terms

Navy Veterans Exposure, Shipyard Exposure, Amosite, Pipe Insulation, Boiler Lagging, Military Specifications (MIL-SPEC)

Notes

• If you served aboard a U.S. Navy vessel built or refit between the 1920s and 1970s, request your full service record (DD-214, deck logs, and rate/rating history) to document compartments and equipment you worked around.
• Veterans with mesothelioma are presumptively eligible for VA disability benefits. File a VA claim in addition to any civil claim against insulation and equipment manufacturers.
• Preserve any photographs, ship yearbooks ("cruise books"), or unit rosters; these can help your legal team identify specific asbestos-containing products aboard your ship.
• Shipyard civilian workers from yards such as Brooklyn, Norfolk, Philadelphia, Puget Sound, and Mare Island also have exposure claims tied to this era of naval construction.