Staff (building material)

Rabitz is the name for wire lath, which consists of a load-bearing structure made of metal, the Rabitzgitter as plaster base and the plaster. The procedure was developed by the Berlin master mason Carl Rabitz and 1878 applied for a patent. Rabitz are attributable to the trade of plasterer.

Precursor

The precursor of this technique are already known in the 1840s and have been imported from various artisans from France to Germany. The supporting structure consisted at that time but still made of wood, which partly led to severe cracking due to the working of the wood. Carl Rabitz further developed this technique by using a metal substructure and thus minimized the cracking.

Design principle

The Rabitzkonstruktion consists of a gerippe like construction of round steel bars with a diameter of 5-8 mm, which are installed at right angles and connected at the crossing points with wire firmly together. With vaulted constructions or strongly projecting cornices can and must be stronger iron can be installed. With vertical structures such as ceilings and vaults hangers are also necessary. About this supporting substructure of lath is tensioned. For this, see especially wired reed, ribbed expanded metal, wire bricks and various tissues from metal wires application. This tissue is then expressed with a fiber-reinforced mortar and roughened with a cleaning comb. The fibers mainly of animal hair like hair calf or pig bristles have been proven to date. The expressed tissue is plastered normal. As a plaster lime mortar, lime - cement mortar, cement mortar and plaster come into consideration. Usually plaster or cement mortar is applied. It is therefore also called gypsum and Zementrabitz.

Fireproof plaster ceilings and fire-proof light partition walls

On May 27, 1879 fire test took place on the property of the master builder Rabitz at the Scharnhorststraße 7, in the presence of commissioners of the Ministry of Public Works, the Police Presidium of the fire department and the ministerial Baucommission instead. In this experiment, the " Rabitzsche plaster " for ceiling (DRP 3789) as well as the "patent Construction ( fireproof partitions )" ( DRP 4590 ) should be compared in their fire safety with traditionally created walls and ceilings. This as well as a subsequent attempt on December 28, 1882 confirmed the superiority of the inventions.

Application

With Rabitzkonstruktionen ceilings can be pulled down ( facade ) Cornices been hidden, made ​​the vault and non-bearing stud walls, the sheathing of pillars and supports, the facing of installations and the construction of ventilation ducts are running. Today Rabitz is often replaced by drywall because he ( have basis weights up to 80 kg in vaults possible) against the drywall, especially more expensive to manufacture and much heavier. It also brought by producing more moisture in the building and assembly as well as a possible termination are very time consuming. But Rabitz also has advantages. So he met basically high fire protection requirements, such as a Gipsrabitzdecke is basically defined with a building inspection appointment of F60A. The large self- sustainability and the possibility of formation of a completely free gerabitzten area open even today many applications, especially in the innovative interiors of buildings in conjunction with stucco. Another application area is the historic preservation.

Standardize

• For large Rabitzdecken decree of the former Prussian Minister for People's Welfare from December 15, 1930 IIC 2494 and DIN 4121 from August 1951
• For Rabitzwände DIN 4103
• Technical regulations for construction work. DIN 1964 B, Section 15, with respect to this work ( there wire lath ) states as follows: " wire mesh with round or band iron, clamp screws, hooks, forged nails or iron loops properly to secure and tight to tension, so that and in the areas occur at the terminals, no cracks. Aufhängeeisen must be placed in the required number and strength. For the plaster core hair mortar must be used. Otherwise, the provisions for wall and ceiling plaster shall apply mutatis mutandis. "
• Continue to DIN 18350 ATV plaster and stucco