Please list the steps for filling the joints of plasterboards in sequence
When filling the joints of gypsum boards, the following steps are performed:
1) filling the joint with putty gypsum;
2) pressing a reinforcing tape made of perforated paper or fiberglass;
3) filling the board joints with gypsum putty.
In the case of filling with gypsum with an admixture of fibers, it is not necessary to stick the reinforcing tape.
What is necessary – before coating or wallpapering – processing of flat gypsum boards, carefully assembled?
To equalize the difference in absorbency between the paper and the putty surface and to increase water resistance, plasterboards should be primed with a special primer, diluted with water or solvent. In the case of wallpapering, this treatment makes it easier to remove the wallpaper later.
On plasterboards stored for a long time in conditions of increased humidity, after they are assembled, yellow discoloration appeared after the applied dispersion paint dried. Please indicate the causes of discoloration and recommended remedies.
As a result of moisture, tannic acid is released in the wood fiber cardboard covering the gypsum board. It is he who gives the dispersion paint a yellowish color. Because tannic acid is soluble in water, such discoloration can be painted over with any solvent-containing coating. These defects can be eliminated, by applying a coating of solvent paint to the interior surfaces.