Brick slips may steal the spotlight once they’re on the wall, but behind every successful installation is a step that rarely gets the credit it deserves: applying PVA. Often overlooked or rushed, PVA plays a crucial role in ensuring brick slips stay firmly in place and look good for years to come.
When installing brick slips, the condition of the wall matters just as much as the adhesive you choose. Most internal walls — especially plaster, plasterboard or older masonry — are porous. Without preparation, these surfaces can absorb moisture from the adhesive far too quickly. This weakens the bond, making it harder for the brick slips to adhere properly and increasing the risk of future movement or failure.
Applying PVA first solves this problem. PVA acts as a sealing layer, reducing suction and creating a controlled surface for the adhesive to grip. Rather than drying out unevenly, the adhesive cures at a steady rate, allowing it to form a strong, reliable bond between the wall and the brick slips.
The process itself is simple but important. PVA is usually diluted with water and applied evenly across the wall using a roller or brush. The aim isn’t to flood the surface, but to create a consistent layer that slightly seals the wall. Timing matters too. Brick slips should be applied when the PVA is tacky, not fully dry, ensuring maximum adhesion.
Skipping this step can lead to subtle but serious issues. Brick slips may initially appear secure, only to loosen over time. Grout lines can crack, and tiles may begin to sound hollow when tapped. These problems are often blamed on poor adhesive or installation, when the real issue is inadequate surface preparation.
PVA also improves consistency across the wall. On mixed surfaces — for example, where plaster meets blockwork — suction levels can vary dramatically. A coat of PVA evens this out, helping brick slips sit flat and align properly, which is especially important for achieving clean grout lines and a professional finish.
Ultimately, PVA isn’t about cutting corners; it’s about reinforcing them. Brick slips are an investment in the look and character of a space. Taking the time to prepare the wall properly ensures that investment lasts. While it may be invisible once the job is complete, PVA is the quiet foundation that allows brick slips to perform exactly as they should.