This section is from the book "Hicks' Builders' Guide", by I. P. Hicks. Also available from Amazon: Hicks' Builders' Guide.

A cornice usually consists of several members, the most common kind being known as the five-member cornice, which consists of a planceer, fascia, frieze, crown and bed molding. To estimate the quantity of lumber required for a cornice, multiply the length in feet by the combined width of the planceer, fascia and frieze in feet. Thus if the planceer is 12 inches wide, the fascia 4 inches and the frieze 12 inches, the combined width is 28 inches, which reduced to feet equals 2⅓. Now, if we have a cornice 120 feet long and 2 ⅓ feet wide, the operation will be as follows: 120 x 2⅓ = 280 feet, net amount. In cutting up lumber for cornice there is always more or less waste, and it is safe to say that one-eighth should be added to the net figures. One-eighth of 280 is 35; thus the total amount required is 315 feet board measure. The bed and crown molding will each be the same as the length of the cornice, with one-eighth added for waste in cutting. One-eighth of 120 feet is 15; thus the total amount of molding required is 135 feet lineal measure. It usually takes a few feet more of the crown molding than of the bed molding on account of the crown molding being on the outside line of the cornice. This difference is hardly worth noticing except on large jobs. The difference usually amounts to from 2 to 3 feet per square turn in the cornice, and is usually estimated by counting the number of turns.

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