This section is from the book "A Treatise On Architecture And Building Construction Vol2: Masonry. Carpentry. Joinery", by The Colliery Engineer Co. Also available from Amazon: A Treatise On Architecture And Building Construction.
Stiffened Wire Lathing. The use of separate furring strips forms an item of expense that may be avoided by substituting, for the plain wire lathing, those having ribs attached or woven into the cloth. The first mentioned is the Clinton stiffened lath, which consists of narrow strips of corrugated steel fastened to the netting at 8-inch intervals, crosswise to the length of the roll, by means of metal clips. The lathing is nailed to the floor joists or studs with the strips next the wood, and serves to keep the cloth away from it. .
The second kind referred to is the Roebling lath, and is formed of ordinary wire cloth having V-shaped stiffeners woven into the cloth at distances of about 8 inches. These ribs are made of sheet iron, and vary from 3/8 inch to 1 1/2 inches in depth, the former being the standard size, while the heavier sizes are used for furring exterior walls, to provide greater air space. The wire cloth is made with 2 1/2 X 2 1/2, 3 X 3, and 3 X 5 meshes per inch, the first being the usual size for lime-and-hair mortar, and the others being used with hard plasters.
In Fig. 100 is shown the Roebling lath; a represents the plaster; b, the wire cloth, stiffened by the strips c, which are attached to the woodwork d by sharp-pointed nails driven through the point of the V.
213. Expanded and 1/4 in. X 1 1/4 in., and in sheets from 14 to 20 inches in width and 8 feet long; the thickness of the lathing is barely 1/4 inch. This lath possesses considerable stiffness, and does not need stretching-; it can be fastened directly to the floor joists and studding; but, when laid on boards, metal furring should be interposed. The lathing is stiffer when placed so as to have the long diagonals of the mesh at right angles to the studding, etc., to which it is fastened by 1-inch staples.
Fig. 101 shows a kind of metal lathing made from thin sheets of soft and tough steel, slit and expanded so that a diamond-shaped mesh is formed, with the width of the strips turned nearly square to the surface of the sheet. It may be had in two sizes of mesh, 3/16 in. X 1 1/4 in.
214. Perforated sheet-metal lath are made by corrugating or ribbing sheets of thin steel or iron and punching out or expanding some of the metal between the ribs, in order to afford a good clinch for the plastering. There are a number of different kinds, but the general appearance is similar to that shown in Fig. 102. The usual size of the sheets is 8 feet long by from 16 to 24 inches wide. These laths are much more easy to put on than wire cloth, and can be applied as quickly as wood lath, being especially easy to bend to fit corners (where the lathing should never be cut, but continued to the next stud beyond the angle, so as to stiffen the wall and prevent cracks at the corners). The lathing is fastened by means of barbed nails; the nailing should be started at the middle of the sheet and carried to the ends, in order to make the lathing set firmly on the woodwork.
Fig. 102 shows one of the best known and most satisfactory metal laths, which is called the Bostzvick. This is made of ribbed sheet steel, having considerable of the metal between the ribs cut and curved out; the openings are 3/8 in. X 1 3/4 in., and the ribs are spaced 3/4 inch apart. This lath should be put on with the raised side outwards.