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.
Any of the forms of eave finish described above may be used equally well in cases where the wall is of brick instead of wood. In this case a wood plate is placed on top of the brick wall and the rafters are brought down over it, and are either extended out over the wall or are fitted with false rafters. The joint between the brick wall and the wood rafters is finished with a wood frieze.
Cornices may be much more elaborate than any of those illustrated above, indeed those shown here are suitable only for the plainest and cheapest kind of work, but the principles of construction are the same in all cases, the difference being in the amount of ornament applied to the building. The ornament takes the form of molded pieces of timber which are supported by rougher furring pieces placed behind them. Economy demands that the finished pieces be so arranged as to be cut out of boarding of medium thickness, and as much space as possible should be occupied by the rough, concealed furring. As a rule, all of the eave finish can be taken out of 7/8-inch stuff. Care must be taken always to give the gutters the proper slope to the outlets called "downspouts" and they should be made large enough so as not to overflow. A gutter should slope 3/83 inch to the foot.