An overview of what PVA is and why it is used in the plastering process.
PVA stands for Polyvinyl Acetate. It is a widely used adhesive and bonding agent in various construction and renovation tasks, including plastering. Its primary function in plastering is to assist with adhesion and control suction on porous surfaces. PVA is often mixed with water or other compounds for enhanced effectiveness.
PVA serves multiple purposes in plastering, making it an essential material for both professionals and DIY enthusiasts:
When PVA is mixed with water, it can be applied to porous backgrounds to seal the surface and regulate suction. This preparation step ensures that the plaster adheres properly and does not dry out too quickly, preventing the formation of cracks or an uneven finish.
On surfaces with low suction, PVA can be used neat (undiluted) to bond finishing plaster effectively. This application helps establish a strong adhesion between the new plaster and the substrate, ensuring a durable and smooth finish.
For undercoat plasters, PVA can be mixed with Ordinary Portland Cement (OPC) to create a slurry. This mixture acts as a strong bonding agent that is particularly effective for cement-based plasters applied to solid backgrounds. This method ensures that the plaster layer adheres securely and remains intact over time【17:0†source】.
Polyvinyl acetate (PVA) is utilised in plastering as a bonding aid that enhances adhesion and suction control. Its versatility in being mixed with water, used neat, or combined with other compounds makes it an invaluable component in achieving a high-quality plaster finish.