Homeowners and renters often face the dilemma of outdated or damaged walls, and wallpaper presents a practical solution. However, the question of whether you can wallpaper over wallpaper creates uncertainty. The short answer is yes, it is generally possible, but success depends entirely on the condition of the existing layer and the type of materials used. Blindly applying new paper over a problematic surface is a recipe for future failure, so a careful assessment is the essential first step.
Evaluating the Existing Wallpaper
Before reaching for your new design, you must inspect the current wall covering thoroughly. The integrity of the old paper determines if the project is feasible or if a complete removal is necessary. You should look for specific signs of distress that indicate instability beneath the surface.
Signs of Instability
Loose or peeling edges that indicate a lack of adhesion.
Visible bubbles or bulges that suggest trapped air or moisture.
Sagging or soft areas that feel damp to the touch.
Cracks where the paper has separated from the wall.
If any of these issues are present, the old wallpaper is likely failing. Applying new paper on top will trap the problem, leading to the new layer peeling off eventually. In these scenarios, removing the old layer is the only viable path to a long-lasting finish.
The Importance of Surface Preparation
Successful layering hinges on the preparation of the existing surface. Even if the current wallpaper seems secure, it requires specific treatment to ensure the new adhesive bonds correctly. The goal is to create a clean, uniform, and slightly textured canvas.
Begin by cleaning the walls with a mild detergent to remove dust and grease. Once dry, lightly sanding the surface is crucial. Sanding roughens the glossy or smooth face of the old paper, allowing the new adhesive to grip effectively. For best results, use a medium-grit sandpaper and wipe away all dust with a damp cloth before proceeding.
Material Compatibility Matters
The type of wallpaper currently on your walls plays a significant role in the success of the project. Modern materials behave differently than older ones, impacting their ability to stack.
Vinyl wallpapers are the most compatible for layering because they provide a non-porous, stable base. Paper wallpapers can be layered, but they are more fragile and prone to tearing during the preparation stage. Avoid placing new paper over heavily textured or fabric-based walls, as the bond will be inconsistent.
The Adhesive Application Technique
How you apply the new adhesive is just as important as the materials you choose. When wallpapering over wallpaper, you cannot rely on the wall to absorb the paste; the new paper must adhere directly to the old surface.
Rollers are not ideal for this specific application because they often fail to penetrate the existing layer. Instead, use a smooth-edged brush to apply the paste directly to the back of the new wallpaper. Ensure full coverage, especially at the seams, to eliminate air gaps. Work in small sections to maintain control and alignment, pressing the new paper firmly into the old layer with a smoothing brush to activate the adhesive.
