In order to economize the floor space as much as possible, devices have been introduced for constructing partitions that, when plastered both sides, will be only from 1½ to 2¾ inches thick. Such partitions are now commonly designated as "thin" partitions. There are a number of devices for constructing thin partitions, nearly all of them using 1½-inch steel studding, to which expanded metal or wire lathing is applied, and sometimes burlap. These constructions are generally erected by the plasterer, and will be described in Chapter XL
Henry Maurer & Son have patented a partition made of 2-inch blocks of solid porous terra cotta, each block being connected to the other by a galvanized iron clamp. The bottom and top courses are also secured to the floor and ceiling by means of a galvanized iron shoe. No other supports in the shape of ironwork are necessary, and it is claimed that the partition is very stiff. The blocks can be put up by either carpenter or mason. The thickness of the partition, when plastered both sides, is 3 inches, and the weight per square foot, including plastering, 20 pounds.
The Lee Construction Co. also have a patented thin partition, which is made of exceedingly light and porous plates of porous tiling, with tension rods of twisted steel wires placed on each side and imbedded in the plaster. No studding is used. The tension rods, being on the outside of the partition, make the partition very stiff and perfectly straight. This partition is made by the Lee Co. and plastered one coat with hard-setting plaster, such as "Acme" or "Windsor," so that only the finishing coat of plaster need be applied by the plasterer. The Lee Co. also supply and set the rough frames for doors and side lights, and build in all nailing blocks for the base, chair rail and picture mould. The thickness of this partition when finished is. 2 inches for stories 13 feet high, 2½ inches for stories from 13 to 15 feet, 3 inches for stories 15 to 18 feet and 4 inches for stories 20 feet high. This partition was used throughout the fifteen-story Syndicate Building in New York City.
It is generally customary to fur the basement walls of fireproof buildings, and occasionally the walls above, with tile blocks made for this purpose.
The most common shape of furring tile is that shown in Fig. 203, the blocks being 12 inches square and 2 inches thick, although furring tile are made 1½ inches thick, and in both larger and smaller sizes. They are also made of both dense and porous tiling. The latter possesses the advantage that nailing strips are not required, but it is doubtful if they offer as good protection from moisture as the harder burned fire clay tiles.
Flat-headed nails are driven at the joints into the brickwork to secure the tiles until the mortar has set. When dense furring tile are used, ½-inch strips of wood should be laid in the joints, either vertical or horizontal, to receive the grounds or wood finish. Three-inch hollow partition blocks are also sometimes used for furring.
Fig. 204 shows a good method of furring the walls of rooms used for cold storage, etc.