Plaster can be used almost in all rooms, except for those that are exposed to permanent and intense dampness (where the humidity exceeds more than 70%, for example, saunas, swimming pools, industrial kitchens, unheated garages and cellars, etc.) . 

Plastering works should be carried out at temperatures above + 5ºC measured in the room as well as on the surfaces of walls and ceilings. 

Gypsum plasters are applied in one layer on the walls and ceilings on various types of substrates: eg cellular concrete, sand-lime elements or made of pumice and ordinary concrete, mixed walls or porous wall elements. 

Depending on the size of plastered surfaces, the work is carried out manually or by means of an aggregate. In the case of large area plastering, the most economical solution is to use the PFT G4 plastering aggregate. 

If you want to have equal and smooth walls and at the same time save material and plastering work quickly and efficiently. Correctly made, they have a smooth and an even surface. They do not require additional plaster coating, which obviously translates into material saving and labour costs. 

Preparation of the substrate 
We start with the preparation of the substrate, which will ensure adequate adhesion and high quality of the plaster. Each substrate should be dry, not frozen, stable, free from dust, residual paint and other dirt. Absorptive surfaces (e.g cellular concrete, silicate, mixed wall) should be primed. Tight, non-absorbent substrates (e.g concrete, polystyrene), prime. At the interface between two different building materials on one surface, on installation furrows, on a styrofoam substrate or wall heating, a recessed screen should be used, thus avoiding scratches. 

Making and applying 
The PFT 4 plastering aggregate is connected to a permanent power source and a permanent water source. We throw the plaster sack onto the hopper basket of the PFT 4 plastering unit, on which a notch is used to open the bag. Next, the plaster is filled with a feeder into the mixing chamber in which it connects with water. The processed mortar is pumped through the hoses to the outlet nozzle at the spray tip from which it is discharged to the outside. We direct the mortar from the aggregate using the spray tip to the previously prepared substrate. The thickness of the applied layer should not exceed 25 mm on the walls and 15 mm on the ceilings. 

contracting
To pre-align the mortar, we use a “H” type plastering plaster, which we run at a small angle in relation to the ground. After applying the plaster, we measure the control surface using a spirit level. If the deviations from the vertical or unevenness of the plane are too great, a sufficient amount of fresh mortar should be applied. 

Drawing with a patch

Surface equation The 
Exact levelling of the plaster should start at the moment when the initial bonding phase begins in the cast. This is done using a trapezoidal patch. Plaster equation requires enormous experience and is one of the most difficult elements of plaster processing. 

The exact equation of the surface

Pre-gluing of the so-called surface “Feathering”
The “feathering” phase of the plaster is made in order to compensate for slight unevenness created during the previous stages. This is done using a surface putty, colloquially known as a “feather”. 

Initial smoothing
 

“Sponging” 
After some time, the gypsum plaster surface should be sprinkled with a scattered stream of clean water and spongy. We make sponging in order to “remove” gypsum from the plaster, which in the next stage of treatment will be needed to smoothen the surface of the plaster. 

“Sponging”

Finishing the surface
After “matting” the milk, we proceed to smoothing the plaster using a surface putty or metal trowel. After the final smoothing of the surface, let the plaster dry completely. Dried gypsum plasters can be painted, layered with wallpapers or tiles.