Topic 2. Interior Plasters

Technological process of plastering

  • substrate treatment (removing the dust, cleaning)
  • applying the 1st layer of mortar
  • applying the 2nd layer of mortar
  • treatment of the plaster surface
  • applying a protective layer (decorative plaster)

 

Substrate treatment of rough plasters from traditional mortar

The adhesion of the plaster to the substrate is ensured by modifying the substrate. It consists of several operations, which depend on the type of substrate. 

1) masonry substrate

  • cleaning the substrate from dirt and mortar residues
  • dry substrate: wetting of the substrate so as not to dehydrate the plaster quickly)
  • priming

2) concrete and/or reinforced concrete substrate

  • cleaning the substrate from cement putty
  • cleaning the substrate from dirt and or formwork oil
  • treating the surface in case of efflorescence (surface colouring/staining) of calcium oxide or iron oxides
  • priming

3) gypsum plasterboard panels substrate

  • cleaning (dusting) the substrate
  • priming

4) gypsum plasterboard panels substrate

  • cleaning the wall thoroughly from crumbling particles and grains of sand
  • wetting of the wall by sprinkling water over it
  • applying a 3-4 mm cement-sand mortar layer (1:3 cement: sand ratio); sieved sand with grain size up to 3 mm is used; it is left to harden for 3-4 days; in warm weather, the layer is kept wet during the first 1-2 days