5 Common Plastering Defects

​Plaster is a popular building material. It is used for covering the rough surfaces of walls, ceilings, columns and other building components. The most common types of plaster usually contain lime, cement or gypsum.  From durability to low thermal conductivity, there are several benefits of plaster. Plaster gives an elegant finish to walls. When used for decorative purposes, plaster can help improve the aesthetic appeal of houses.
 
Defects can occur in plastering over time. If you fail to address plastering defects, your wall can turn into an eyesore.  Also, your plaster may shrink or crack prematurely.
 
Here are some common plastering defects every homeowner should know about. 

​Blistering of the Plastered Surface 

​Blistering occurs when small patches of plaster swell out beyond the plastered surface. Blistering usually happens when plaster is not mixed properly. It generally affects the plastered surface inside buildings. To prevent blistering, make sure cement and other components are mixed together in the right proportion. 

​Cracks in Plaster 

​Common types of structural cracks that can occur in plaster include crazing, cracks with hollowness and separation cracks at joints. Crazing is characterized by a network of very fine cracks. They usually do not extend through the entire depth of plaster.  Crazing occurs when there is too much fine content in the plaster work.
 
Cracks with hollowness occur when the plaster is too hollow or there is extra water in it. Poor workmanship can also lead to these cracks. Separation cracks commonly occur at joints of two different materials such as RCC and brickwork. Cracks can be avoided by ensuring proper curing of the plaster. Add the right amount of water to mortar to achieve the desired workability. 

​Efflorescence on Plaster   

​Efflorescence appears as white alkaline salts on the surface. It occurs when soluble salts are present in plastering materials and building materials such as cement and/or sand. Even water used for construction can contain soluble salts. Efflorescence can lead to damp walls, causing serious problems. Before plastering a wall, make sure that the surface is completely dry and plastering materials do not contain salts. 

​Falling out of Plaster 

​This defect can occur in two ways-flaking and peeling. Flaking happens when a small loose mass forms on the plastered surface. It results from bond failure between successive coats of plaster. Peeling occurs when the plaster from a small portion of the surface comes off, resulting in a patch. Flaking and peeling can be prevented by ensuring proper surface preparation.

Popping

Popping is the formation of conical holes in the plastered surface. It occurs when contaminants such as burnt lime or organic materials are present in the mortar mix.
 
Is your plaster blistering bubbling? Let Do-All Stucco & Stone help. Our pros have years of experience restoring and repairing plaster. We also specialize in stucco painting in Calgary. To schedule stucco remediation in Calgary, call 403-588-5306.