Why Does Lightweight Gypsum Plaster Bubble After Application?
Created on Today
On many construction sites, bubbles appear shortly after lightweight gypsum plaster is applied to the wall.
Most people immediately blame poor workmanship, excessive water, or improper finishing.
However, bubbling is usually not caused by alone.
Lightweight gypsum plaster usually contains vitrified microspheres and other lightweight aggregates with porous structures. During mixing, large amounts of air can become trapped inside the mortar.
After application, the substrate absorbs water while the surface dries and begins setting. If trapped air cannot escape in time, bubbles will form on the surface.
Fast substrate absorption, dense concrete walls, hot weather, and strong airflow can all make bubbling more severe.
Besides materials and substrates, mixing and application details are also critical.
High-speed mixing, excessive mixing time, and immediate application after mixing can introduce large amounts of trapped air into the mortar.
The most effective solution is not blaming workers, but optimizing the entire application system:
- Use low-speed mixing
- Control mixing time
- Allow short resting time after mixing
- Properly treat the substrate
- Apply plaster in layers
These measures are far more effective than repairing bubbles afterward.
Bubbling in lightweight gypsum plaster is the combined result of material properties, substrate condition, and application environment.
Only by optimizing formulation, substrate treatment, and construction process together can long-term application stability be improved.
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