This section is from the book "Cyclopedia Of Architecture, Carpentry, And Building", by James C. et al. Also available from Amazon: Cyclopedia Of Architecture, Carpentry And Building.
Before the building is ready for the plasterer, the outside and the roof must be made tight. We have seen that the gutters are set and primed or oiled to protect them against water; and above the gutter, and rebated or tongued into the back, is set the "shingle facia", a vertical board varying in width according to size of gutter and pitch of roof. This facia is usually bevelled off on top to receive the butts of the first course of shingles. (Fig. 36.)
The shingling of the roof begins upon the facia with a double course projecting a little, and from the butts of these shingles are measured off the courses of the roof. Unless the roof is very steep the courses should not exceed four-and-a-half inches for the ordinary length of 16 inches, as cedar and redwood shingles are usually sawn. Cypress shingles are found 18 or 20 inches long and are the most durable of all shingles, but redwood and cedar, especially cedar, are more commonly used. Regarding durability, cypress shingles have been known to have lasted more than a hundred years, redwood shingles from 25 to 50 years, and cedar shingles from 12 to 20 years.
Fig. 36. Glitter.