Plaster Cracking When Drying __full__ File

Cracking is typically a result of the material losing moisture faster than its internal structure can support, leading to "shrinkage".

Cracks occur when the , or when the plaster shrinks unevenly. plaster cracking when drying

Using a dehumidifier or a fan heater too early is a guaranteed way to cause cracks. Dehumidifiers should ideally not be used for the first 48 hours to avoid pulling moisture from the surface while the core is still wet. Identifying Types of Drying Cracks Cracking is typically a result of the material

The surface behind the plaster—the substrate—is just as important as the plaster itself. If a wall is highly porous (like old brick or certain types of masonry), it acts like a sponge, sucking the moisture out of the wet plaster before it has a chance to cure. Professionals often use a "primer" or "bonding agent" to manage this suction. If the substrate moves or flexes due to structural settling or thermal expansion, the rigid plaster on top will inevitably crack, as it lacks the elasticity to move with the building. Dehumidifiers should ideally not be used for the