One of the most common questions we are asked is why plaster cornices sometimes develop cracks after installation.
The truth is that plaster itself is not usually the problem. In many cases, cracking is caused by movement, poor installation practices or issues with the underlying building structure.
Building Movement
All buildings move to some extent. Seasonal temperature changes, settlement and structural movement can place stress on decorative plasterwork.
Older properties are particularly susceptible, especially where previous repairs have been carried out or different building materials meet.
Poor Jointing and Installation
Cornices are often installed in multiple sections. If joints are not prepared correctly, reinforced properly or allowed to cure under suitable conditions, cracks can develop over time.
Accurate mitres, strong joint reinforcement and correct fixing methods are essential for long-term performance.
Inadequate Fixings
Large plaster mouldings require appropriate mechanical fixing and support. Relying solely on adhesive products can lead to movement and eventual cracking.
The fixing method should always be suitable for both the moulding and the substrate.
Manufacturing Quality
The quality of the moulding itself also plays a role. Properly reinforced and correctly dried plaster mouldings are generally more stable and durable than poorly manufactured alternatives.
This is why attention to detail during manufacture is just as important as installation.
How We Minimise The Risk Of Cracking
At Profile Mouldings Yorkshire, we carefully consider every stage of the process, from manufacture and drying through to fixing, jointing and finishing.
By combining traditional craftsmanship with modern installation techniques, we help ensure decorative plaster mouldings remain stable, secure and attractive for many years to come.
Need Advice?
If you have existing plaster mouldings showing signs of cracking, or you’re planning a new installation, contact Profile Mouldings Yorkshire for professional advice and a free quotation.