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To remove pre-pasted wallpaper, you’ll need to wet the wallpaper or steam it to loosen the paste on the back of the wallpaper. Spray the paper with water, then let it soak for 10 to 20 minutes. From there, you should be able to peel off the wallpaper. Then, you may need to follow up with a cleaning solution and a scraper to remove any remaining wallpaper paste on the walls.

It can take a professional anywhere between several hours and a full day to remove wallpaper in one room. How long wallpaper removal takes depends on the type of adhesive, the wallpaper’s age, the condition of the walls, and more.

In most cases, it is not recommended to wallpaper over existing wallpaper, as the success depends on the type of paper already on the wall. While you might be able to cover non-coated wallpaper, you should never apply new wallpaper over a vinyl-coated one, which is more common. Doing so can lead to poor adhesion, resulting in bubbles, imperfections, and peeling. It can also trap moisture, potentially causing hazardous mold growth between the layers.

Even if the existing wallpaper is suitable, experts recommend applying only one new layer. Adding multiple layers (more than two total) can cause significant adhesion problems, leading to warping and bubbling. For the best results, the recommended approach is to remove the old wallpaper and all paste residue before hanging the new paper. If you are unsure about your wallpaper type, consider consulting a professional.

You’ll need to wash the walls to remove wallpaper adhesive residue after removal as part of the prep process for painting or rehanging wallpaper. Old adhesive can cause texture issues and prevent paint or wallpaper from adhering properly to the wall’s surface.