Reinforcement mesh
Reinforcing fabric or plaster reinforcement called, is used for reinforcement of plaster layers to cracking. A typical application is the production of a resistant plaster layer (reinforcing layer) on a flexible insulation layer as part of a thermal barrier -Verbundsystems.
nature
It usually consists of tear-resistant, alkali-resistant and non-water-swellable glass fiber fabric . Depending on the requirements of the thermal insulation composite system, the reinforcement fabric is available in various so-called mesh sizes and weights per unit area . As a rule, the reinforcement fabric with a mesh size of 4 mm × 4 mm and a weight per unit area of 165 g / m² is used.
use
By embedding the reinforcement fabric, an effective increase in the crack resistance in the plaster is achieved and unwanted cracking, e.g. B. by shocks are avoided. The reinforcement fabric is applied or embedded in that the reinforcement fabric is placed on the first layer of the previously applied reinforcement mortar. Then the second layer of reinforcement mortar is applied. This is called the so-called embedding of the reinforcement fabric. The individual layers or strips of the reinforcement fabric must not be abutted, but always approx. 10 cm above or below the strip of reinforcement fabric applied below. This is referred to as the so-called professional " overlap " of the reinforcement fabric to be embedded.
If the substrate consists of materials with poor load-bearing capacity or those with poor plaster adhesion, plaster bases such as (screed) grids or expanded metal are used instead of reinforcing mesh . If the wall contains wooden beams and bars, these are often spanned with plaster base grids. This should be attached to the masonry next to the wooden components so as not to join the movement of the wood. In the past, the wooden components were often also blocked off with bitumen paper or roofing felt. Plaster boards made of wire mesh are also available with an integrated, moisture-resistant cardboard strip, which almost completely decouples the plaster layer from the substrate. In order to be able to apply thicker layers of thermal insulation plaster in one operation, corrugated plaster base fabric is also used.
Reinforcement mortar
The mortar used to embed the fabric often contains a high proportion of synthetic resin , which results in a robust plaster layer despite the low thickness of the application. Depending on the manufacturer, the terms embedding mortar , adhesive mortar and reinforcement plaster are also used.
literature
- Klaus-Jürgen Schneider, Georg Sahner, Ronald Rast (eds.): Masonry construction current: Practical handbook 2009 for architects and civil engineers . Beuth Verlag, 2009, ISBN 978-3-410-21544-8 (720 pages, limited preview in the Google book search).