Raised edges occur when the wallpapers edges/seams start lifting away from the wall after installation. This is usually caused by insufficient paste application, poor wall preparation, or excessive pressure during installation. While this is not a fault with the wallpaper itself, it can usually be avoided with the correct installation techniques. If edges are not properly adhered at the time of installation, they may lift as the paste dries.
Common Causes:
- Not enough paste applied to the edges – If paste isn’t spread all the way to the edges, they won’t properly adhere, leading to lifting.
- The wall wasn’t properly primed – Unsealed, dusty, or overly absorbent walls can weaken adhesion.
- Too much pressure on seams during installation – Pressing too hard, especially with a seam roller, can push paste away from the edges, preventing a strong bond.
- Wallpaper paste dried before installation – If paste-the-paper wallpaper isn’t hung quickly enough, the glue can lose effectiveness.
How to Fix It:
- Apply a specialist wallpaper edge adhesive to the lifted edges for a stronger hold.
- Test it first on a small, inconspicuous section before applying it to all lifted areas.
- Use a fine brush or syringe to apply the adhesive carefully, avoiding excess glue on the wallpaper surface.
- Press the edges back into place using your fingers or a damp cloth
- Wipe away any extra adhesive with a damp sponge before it dries.
- Be aware that fixing raised edges may not always result in a perfect finish, as the wallpaper may have already stretched or dried in a way that makes it difficult to reposition seamlessly.
How to Prevent Raised Edges in the Future:
✔ Ensure proper wall preparation – Walls should be clean, dry, smooth, and properly sealed before wallpapering.
✔ Ensure thorough and even paste coverage – Apply an even layer of paste across the entire wall, making sure there are no dry spots or thin areas. If using paste-the-paper wallpaper, also apply a thin strip of paste on the wall where the drops meet to improve edge adhesion.
✔ Apply enough paste to the edges – Paste must be applied right to the edges to ensure strong adhesion.
✔ Avoid excessive pressure on seams – Instead of a seam roller, use a smoothing brush or a damp, clean cloth to press seams down without removing paste.
Conclusion
Raised edges are a frusrtrating wallpapering issue that can spoil the finish of your wall - but they are usually easy to prevent with proper paste application and installation techniques. Ensuring even paste coverage, especially at the edges, is key to avoiding lifting seams. Using a specialist wallpaper edge adhesive can help secure lifting seams, but always test in a small area first. Keep in mind that attempting to fix raised edges may not always give a flawless result, so prevention is key.
For further assistance, contact us for expert guidance!