![]() ![]() Companies such as behemoth Johns-Manville and The Asbestos Shingle, Slate, and Sheathing in Ambler in Pennsylvania promoted asbestos shingles not only for new construction but also for roofing over existing roofs. Shingles could be punched, filed, or trimmed to size in the field by roofing contractors. Installation of asbestos shingles was similar to slate. The French method was particularly popular for asbestos roofing, capitalizing on the economy of the material itself by laying it in an efficient manner requiring minimal overlap. The many styles and sizes of asbestos-cement shingles available, made possible roofs laid in various methods including American, Dutch Lap, and French (known in several variants as hexagonal, honeycomb or diamond). The hydraulic pressing process enabled the shingles to be given a texture, such as a rough rustic surface or one imitating weathered wood. Courtesy of The Sweet's Group-The McGraw-Hill Companies, Inc.) ( Home Owners' Catalogue, A Guide to the Selection of Building Materials Equipment and Furnishings, F. The Dutch Lap roof being applied here was easy to install and utilized a metal "clincher" to anchor exposed corners. ![]() Johns-Manville promoted the direct application of their asbestos-cement shingles over worn roofing in this 1936 catalog. Vandervoort Walsh to exclaim in 1922: "For this reason we see on every hand red asbestos-shingle roofs which have bleached to sickly and thirsty pinks." Unfortunately, many early asbestos-cement shingles faded over time, causing Columbia professor H. Manufacturers assured potential customers that their shingles were colorfast. Colors imitating slates, including Indian Red and Newport Gray, were common, but many other colors were available. these Asbestos Singles or Slates are so immeasurably superior in point of practical merit to that of any natural slating that nothing remains to be said."Ī variety of shingle colors could be created by adding pigments to the wet mix before pressing or by rolling pigments onto the surfaces of shingles. The Asbestos Shingle, Slate and Sheathing Company proclaimed in 1910: ". These drawings accompanied Architects's Specification included in a publication of the Asbestos Shingle, Slate & Sheathing Company. Manufacturers of asbestos-cement shingles and other asbestos building products appealed to architects and builders directly with extensive advertising campaigns. Manufacturers promoted their shingles as substitutes for traditional roofing materials such as slate, wood, and clay. Made from asbestos, an inorganic, fibrous mineral, and Portland or hydraulic cement, asbestos shingles were lightweight, economical, and fireproof. One early American manufacturer, Eternit, took their company name from the title Hatschek had given his process. Hatschek's patent, reissued in United Stated in 1907, led to a rapid proliferation of the new shingles. In the United States, mechanized production of asbestos-cement shingles began in the first decades of the 20th century, following Austrian Ludwig Hatschek's invention of a process in 1900 to manufacture rolled and pressed asbestos-cement sheets. ( The Catalog of Johns-Manville Building Materials, Home Owners' Catalogue, A Guide to the Selection of Building Materials Equipment and Furnishings, F. The Asbestos Shingle, Slate, and Sheathing Company touted the advantages of their shingles with depictions of successful installations in their 1927 promotional catalog and price list. From Asbestos to Zinc, Roofing for Historic Buildings, National Park Service ![]()
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