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Post Requirement
Painting works are performed on the plastered surfaces. If the plaster quality is not good, the creativity of painting will get spoiled. Before plastering the walls, we need to ensure the quality and fix it to prevent future damage.
The primary defects appear in plastering are discussed below:
This defect is purely due to unskilled workers.
Debonding occurs when plaster is separated from the wall. It can be caused by an excessively thick plaster layer, inadequate substrate preparation or may be due to a dusty, oily or dry substrate.
There can be various reasons that lead to cracking on the plastered surface, and it's difficult to identify hairline cracks until they grow wider.
The cracks can be formed due to thermal expansion or rapid drying, movements in the background or in the plaster itself, improper preparation of the old surface, poor workmanship or due to excessive shrinkage of the plaster which occurs when the coat is too thick.
This type of defect may be seen on the plastered surfaces applied on metal laths.
Efflorescence is a whitish crystalline substance on the surface of a wall. This appearance is due to the unburnt salt present in lime, cement, brick, sand and salt in water.
When the wall dries out, the soluble salts absorb moisture from the atmosphere through the pores and get deposited in patches in the form of white crystalline patches.
These patches disappear in wet climates and reappear in dry climates. It can be managed to some extent by repeated dry brushing and washing.
This defect is due to late slaking of the lime particles in the plaster. It appears as swellings in the form of small patches of the plastered surface.
Grinning is the appearance of the mortar joints or similar breaks in the continuity of the surface characteristics of the background. Applying undercoat before plastering may help prevent grinning.
Small loose masses are formed on plastered surfaces due to failure of bonding between the coats, known as flaking. If a small portion comes off the surface and a patch is formed, known as peeling.
The development of fine hair cracks on the surface of the wall is known as crazing.
Popping is the formation of conical holes in the plastered surface due to the presence of some materials such as seeds, dead burnt lime etc. which expands on the setting.
Plastering should be done on well prepared dry surfaces that are suitable for recovering plaster. Skilled workers and good quality material should be used to avoid these defects.
Technically Reviewed by Rajesh Pagadala, MS, Founder & CEO - BuildersMart. Written by Vani paspula, Content Manager.
Obidur Rahman
posted on Aug 16, 2021 10:25:18 AM