Can you install wallpaper over wallpaper?
Yes, you can install wallpaper over existing wallpaper, but it’s often not recommended. Success depends on the condition of the old wallpaper. If it’s vinyl, washable, or in good condition, it might work. If it’s old, peeling, or textured, you risk a poor finish and future damage.
The short answer is yes, you can install wallpaper over existing wallpaper, but it’s a decision that requires careful consideration. While it might seem like a shortcut to save time and effort on wallpaper removal, it’s a gamble that often doesn’t pay off. The success of this method hinges entirely on the type and condition of the existing wallpaper.
If the current wallpaper is vinyl, vinyl-coated, or a washable type and it’s firmly adhered to the wall with no signs of peeling, bubbling, or damage, it might serve as a viable surface for new wallpaper. These types of wallpaper create a relatively smooth and stable base. However, even in these scenarios, problems can arise.
The most significant risks involve adhesion and the appearance of the final result. The new wallpaper might not adhere properly if the old surface isn’t perfectly clean or if there are microscopic gaps. Furthermore, any imperfections in the old wallpaper – seams, bubbles, or texture – can show through the new layer, creating an uneven and unprofessional look. If the old wallpaper is paper-based, textured, or already peeling, attempting to wallpaper over it is almost guaranteed to lead to failure.
When is it okay to wallpaper over wallpaper?
You can consider wallpapering over existing wallpaper only if all the following conditions are met:
1. **The existing wallpaper is firmly adhered:** There should be absolutely no peeling, lifting edges, or bubbling anywhere on the walls. Even small areas of lifting can telegraph through the new wallpaper or cause the new adhesive to fail.
2. **The existing wallpaper is non-porous and smooth:** Vinyl, vinyl-coated, or washable wallpapers are the only types that might work. Avoid this method entirely if the existing wallpaper is textured, fabric-backed, or a standard paper type. These materials are porous and will absorb moisture from the new adhesive, leading to swelling and eventual failure.
3. **The existing wallpaper is a single layer:** If the current wallpaper was installed over another layer of wallpaper (a common practice in older homes), do not proceed. Each subsequent layer adds more potential points of failure and creates a surface too thick and unstable for new wallpaper.
4. **You are using a high-quality, heavy wallpaper:** A thicker, more robust wallpaper might have a better chance of covering minor imperfections in the underlying layer. However, this is not a guarantee.
Why wallpaper removal is usually the better choice
Stripping old wallpaper might seem like a daunting task, but it’s the professional and reliable approach for several reasons. Firstly, it ensures a clean, smooth, and stable surface for your new wallpaper, guaranteeing optimal adhesion and a flawless finish. Secondly, it prevents the issues associated with layering wallpaper, such as the risk of the old paper delaminating behind the new layer, creating bubbles or tears.
Moreover, if the old wallpaper is damaged, discolored, or contains lead paint (in homes built before 1978), removal is essential for health and safety. Attempting to cover these issues often results in a worse aesthetic outcome and potential hazards. The process of removal, while labor-intensive, provides peace of mind that your new wallpaper installation will last for years to come.
Consider the long-term investment. New wallpaper can be expensive, and a botched installation due to an improper substrate will be a costly mistake. Taking the time to properly prepare the walls by removing the old wallpaper protects your investment and ensures the longevity and beauty of your newly decorated space. For most DIYers and professional installers, the extra effort of removal is always worth the superior results.
How to prepare if you must wallpaper over wallpaper
If you’ve assessed your situation and decided to proceed with wallpapering over existing wallpaper, meticulous preparation is critical. Skipping steps here will almost certainly lead to problems.
**1. Clean the existing wallpaper thoroughly:** Use a mild detergent and water solution to wash the entire surface. This removes any grease, dirt, or grime that could interfere with adhesion. Rinse thoroughly with clean water and allow the walls to dry completely. Any residue from cleaning agents can also affect the new wallpaper’s ability to stick.
**2. Inspect and repair:** Carefully examine the existing wallpaper for any loose edges, small bubbles, or tears. Use wallpaper paste or a suitable adhesive to re-adhere any lifting areas. Smooth them down firmly and allow them to dry. Fill any small holes or imperfections with spackling compound, let it dry, and sand it smooth.
**3. Apply a wallpaper primer/sealer:** This is a non-negotiable step. Use a high-quality wallpaper primer or a specific product designed for sealing old wallpaper. This primer will help to create a uniform surface, block any potential stains from bleeding through, and provide a better ‘grip’ for the new wallpaper adhesive. Ensure the primer is compatible with your new wallpaper type. Apply one or two coats as directed by the manufacturer, allowing adequate drying time between coats.
**4. Test a small, inconspicuous area:** Before committing to the entire room, hang a small strip of your new wallpaper in a hidden spot (like inside a closet or behind a door) and let it dry for at least 48 hours. Check for adhesion issues, bubbling, or if the old pattern is showing through. This test can save you from a much larger headache later.
Tools and potential mistakes when wallpapering over wallpaper
Attempting to wallpaper over existing wallpaper introduces unique challenges and common pitfalls. Understanding these risks can help you avoid costly errors.
The primary risk is adhesion failure. Old wallpaper, even if it seems stable, might not provide the ideal surface for new adhesive. Moisture from the new wallpaper paste can penetrate the old paper, causing it to swell and then shrink as it dries, leading to bubbles or peeling. If the old wallpaper has a glossy or vinyl finish, the new adhesive may struggle to bond effectively.
Another significant concern is the visual outcome. Seams and patterns from the old wallpaper can telegraph through the new layer, especially if the new wallpaper is thin or has a light color. This results in a less-than-perfect finish, with visible lines or a ghosted image of the previous design. Textured wallpaper is particularly problematic, as its uneven surface is very difficult to hide.
Finally, future removal becomes a nightmare. Two layers of wallpaper are significantly harder to remove than one. When it’s time to redecorate again, you’ll likely face a much more labor-intensive process of scraping and steaming.
Common Mistakes When Wallpapering Over Wallpaper
| Step/Tool | Typical Mistake |
|---|---|
| Cleaning the existing wallpaper | Not cleaning thoroughly, leaving behind dirt, grease, or mildew that prevents proper adhesion. |
| Inspecting for damage | Ignoring small bubbles or peeling edges, which will worsen and cause the new wallpaper to fail. |
| Priming the surface | Skipping primer or using the wrong type, leading to poor adhesion, stains bleeding through, or an uneven finish. |
| Applying new wallpaper | Not booking (pre-pasting conditioning) the wallpaper correctly, or applying it too tightly, which can cause seams to gap as it dries. |
| Using a quality adhesive | Using too little adhesive, or the wrong type, especially over a non-porous surface like vinyl. |
FAQ
Will the seams of the old wallpaper show through the new wallpaper?
Yes, there’s a high probability that the seams of the old wallpaper will show through, especially if the new wallpaper is thin, light-colored, or the old seams are not perfectly flat. This is one of the main reasons why removing old wallpaper is recommended for a professional finish.
Can I wallpaper over textured wallpaper?
It is strongly advised against wallpapering over textured wallpaper. The uneven surface provides a poor base for adhesion, and the texture will almost certainly show through the new wallpaper, resulting in an unprofessional and unattractive appearance.
What kind of wallpaper is least likely to show through?
A heavy, thick, high-quality wallpaper with a matte or embossed finish is least likely to show through. However, even with these types, there is still a risk, particularly with dark patterns or glossy finishes on the underlying wallpaper.
How long will wallpaper installed over old wallpaper last?
The lifespan is unpredictable and generally shorter than wallpaper installed on a properly prepared wall. It depends heavily on the condition of the old wallpaper, the quality of the installation, and the type of wallpaper. Issues like peeling, bubbling, or seam separation can occur much sooner.