Plastering of interior walls using gypsum mix MP-75
The plastering works are carried out with the new German PFT-G5 equipment. The team of workers consists of 3-4 highly qualified persons. One team plasters approximately 50-60 sq. m in one day.
Benefits and advantages
- A perfectly smooth surface is the result of the properties of the Knauf dry gypsum mixes;
- After plastering the walls are ready for applying wallpapers;
- Our plastering method is significantly faster, more effective and cleaner than the wet lime-cement plastering;
- The drying time of the walls plastered with the Knauf dry gypsum mix is 50% shorter compared to the wet lime-cement method;
- A single high quality filling of walls is sufficient for painting the plastered walls
Please note that in order to prepare the walls plastered with the Knauf mix for painting it is enough to apply filler only once compared to 3-4 times when using the wet method.
Plastering process
The plastering works are carried out using the German PFT-G5 equipment. Please note that the equipment does not require much room.
Prior to plastering the walls or the ceilings the surfaces are primed. The STUCK-PRIEMER primer is used for all surfaces.
Concrete surfaces are covered using the “Knauf Betokontakt” primer “Knauf Betokontakt” is a primer for sealing non-absorbent surfaces, e. g. for processing concrete prior to covering it with gypsum plaster. For indoor use.
Consumption of materials:
Approx. 250-300 ml/m2 depending on the absorbance capacity.
To obtain high quality of plastering, the walls are leveled with the “plastering profile”.
Metal plastering corners are put at the every outside corner.
We try to use the state-of-the-art technologies. We use German rubber bands for plastering the openings of windows or doors.
Benefits:
- The plaster has no contact with the window or the door;
- The openings are perfectly smooth; and, most importantly,
- microscopic cracks never occur at windows or doors.
After the filling or painting works are finished, a part of the band is torn off.
Plaster is sprayed on the surfaces using the PFT-G5 machine.
After the walls are sprayed, they are leveled using a trapezoid.
After levelling the surfaces and applying the filler which is produced during the leveling process, sponges are used to make the surface perfectly smooth.
Comparison of technical specifications
| Material | MP-75 (plaster) | MP-75L (plaster) | MP-75 Diamant (plaster) | KZ Maschinenputz (lime mortar) | Common Lithuanian lime plaster mortar |
|---|---|---|---|---|---|
|
Flexural strength in tension |
>1,0N/mm2 |
>1,0N/mm2 |
>2,5N/mm2 |
>1,7N/mm2 |
>1,5N/mm2 |
|
Compressive strength |
>2,5N/mm2 |
>2,0N/mm2 |
>6N/mm2 |
>3,0N/mm2 |
>3,0N/mm2 |
|
Water vapor diffusion resistance factor |
8 |
5 |
8 |
16 |
20 |
|
Thermal conductivity capacity |
0,35W/mk |
0,26W/mk |
0,47W/mk |
0,45W/mk |
0,9W/mk |
|
Consumption of material for 1 m2 when the thickness of the plaster layer is 1 cm |
10,5 kg |
8 kg |
12 kg |
15 kg |
16 kg |
Useful tips
In winter, the amount of water vapor in the air indoors is greater than outdoors. Due to the difference in pressure, the warmer water vapor tries to move from the inside to the outside. This is called water vapor diffusion, or, in spoken language, “plaster breathing”. Depending on the plaster mix used, the diffusing water vapor meets certain resistance (μ). The greater the water vapor diffusion resistance factor, the slower the water vapor diffusion through the material.
Thermal conductivity is the capacity of the material to transfer heat, i.e. the thermal insulation of the material. This feature is described by the thermal conductivity coefficient λ (expressed in W/mK). The lower the λ value, the better the insulating properties of the material. It must be noted that MP-75 Diamant gypsum plaster has excellent thermal conductivity properties (0.47 W/mK). Thus, the smaller the coefficient λ, the smaller the heat loss.
READ MORE ABOUT OTHER KNAUF MIXES
