"The walls of the bungalow, previously described, are topped by an overhanging roof covered with spruce shingles, which have been dipped in oil to produce a rich, warm color, and are laid wide to the weather." --from "A Craftsman Bunglaow: Craftsman House Series of 1905, Number III", in The Craftsman, Gustav Stickley, Editor, 7:336. 1905.
"The slates themselves may be 2" or more in thickness at the eaves, and as wide as 42" anywhere on the roof proper, and still produce a pleasing appearance, granting that the slate is not laid so wide to the weather that the roof is thrown out of scale to the building it is protecting." --House and Garden, 32:33, 1917.
See also the 1919 quotation from Dwellers in Arcady in the examples under building-paper.