Case 1
Navigation
- Introduction
- Causes of Defects
- Good Practices
- Standards
- Maintenance and Diagnostics
- Remedial
- Similar Cases
- References
Cause of Defects
- Crazing results from differential moisture movement of the surface of the plaster in relation to its substrate. The cracks formed are narrow and generally do not extend far below the surface, they may however develop into shrinkage cracks.
- Crazing of the final coat may also be caused by a background exhibiting unduly high suction. Some background like brickwall have a high rate of absorption while concrete on the other hand has a lower rate of absorption.
Possible causes of crazing include:
- Excessive Shrinkage of the plaster layer.
- Poor surface curing.
- Improper surface preparation (wetting) before plastering.
- Incorrect mix proportion of the plaster mix.
There are similar cases where crazing of the paint is related to water seepage. For more information on paint crazing due to moisture, please refer to Paint Blistering, Peeling & Flaking.