In considering carpenter work, we will first take up framing, and everything which pertains to the outside of the house. All material used for framing should be sound, square-edged material, free from imperfections tending to impair its use, durability, or strength. In different parts of the country, different kinds of lumber are standard for framing purposes. In the South and sections contiguous to it, yellow pine is used; in the North, white pine, hemlock, Norway spruce, poplar, and even hard wood. It is neither profitable nor desirable in this connection to indicate any particular material; it is natural to use the cheapest that is sufficiently strong for framing. The following table indicates the sizes of timber in common use in framing an ordinary dwelling.
Sizes here given may not be adapted to all sections. There is no occasion for being arbitrary. The sizes may be conformed to the material which is ordinarily used.
Stories ten and a half feet high are generally considered the limit in an ordinary frame house at this time. Nine and a half and ten are more common. This is quite different from the general tendency to high stories a few years ago. Certainly, it is more rational.
JOISTS.
Joists are usually dressed, so that they have about one-half-inch crown or curve on their upper surface, which would make the centre of the room about one-half inch higher than the sides. They should be trimmed so that all are of the same width and form. Double trimmers and headers—that is, double joist—should be framed around all chimney-breasts, well-holes, scuttles, and openings in the wall. In dwelling-house work they should be mortised and tenoned together, as should be the pieces connecting therewith. In very cheap work headers and trimmers are sometimes spiked together. This is not good practice. For very good work, where heavy weights are to be carried, trimmers and headers should be supported on wrought-iron strips. This, however, is not necessary in ordinary dwelling-house work.
Joists longer than eighteen feet should be twelve inches in width. Those running adjacent or parallel to partition or other walls should be firmly spiked thereto. Double joists should be placed under all partitions and supports having no support from below. Where the weight is extra heavy, the double joists should be trussed by a two-by-four-inch stud, spiked in truss form, between them. There should be one row of truss bridging to each span or tier, size as indicated. Header should be framed across pipe duct, about eighteen inches therefrom.
STUD WALLS.
