Machine gypsum plasters
MultiGips machine plasters are a particularly economic and secure working solution for the rendering/plastering of large areas. Application using the machine, as compared with hand working, is significantly quicker and easier. In addition, through the spraying pressure, an improved adhesion is achieved as the gypsum penetrates well into the pores of the background.
MultiGips machine plasters are distinguished by even stiffening and working times to match practical requirements of between 2 and 3.5 hours depending on background and weather conditions. Through this an economic, large surface application of plaster and optimum time planning for dressing and adjustment are possible.
Practical tips for the working of machine gypsum plasters
- Using the compressed air passed to the spray head the gypsum mortar in the desired thickness is sprayed on – as a rule single-layered – 10 to 25 mm thick. If in exceptional cases two applications are to be rendered single-layered, for example with differently absorbent backgrounds, greater plaster thicknesses up to a max. of 50 mm with the employment of a reinforcing fabric is to be sprayed on first thinly and then a following coating of plaster applied absolutely fresh-in-fresh. After spraying, dress the gypsum mortar evenly using a serrated trowel or metal straightedge (striker). If the plaster has stiffened sufficiently [the surface becomes matt], wet slightly and sponge over using the float. With this, note that the plaster still has its own moisture, therefore it must not be wetted too strongly. A so-called sinter skin can form on the surface of a plaster which has been too heavily wetted. Finally, still before the plaster has dried out, carefully smooth and thus remove the slurry using the wall scraper. For surfaces with thin-layer sand-floated plaster structure if required, re-sponge after a certain rest time. With working, observe DIN V 18550.
- The minimum plaster thickness with plastered surfaces, which are to be tiled, is 10 mm. Their surface may not be sand-floated or smoothed. It must be dressed only with the reverse side of a wall scraper in order to obtain a rough surface.
good cross-ventilation after plastering so that the moisture can be extracted. Poor
ventilation can – particularly in winter – lead to a formation of sinter skin.
If a sinter skin has formed drying will be hampered. In this case sand lightly