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No, you don’t always have to remove old wallpaper before applying a new layer. However, you should pull off the existing wallpaper if it’s cracked, peeling, or in poor condition. We’d also recommend against putting wallpaper over textured or dark-colored wallpaper because the old layer may be visible through the new one. In addition, if you try to hang new wallpaper over vinyl-coated wallpaper, the adhesive might not stick properly. 

While many types of peel-and-stick wallpaper can be used in bathrooms, they may not adhere as well in humid environments as traditional wallpaper. For best results, choose a vinyl or polyester-based wallpaper, as these materials are more durable and water-resistant. Good ventilation is also crucial to reduce humidity from steamy showers. In bathrooms with high moisture and inadequate ventilation, even high-quality peel-and-stick wallpaper is likely to peel over time.

You may end up with extra wallpaper once your project is finished. Hang on to that wallpaper, as you may need to use it to patch up areas that get damaged later on. If you have a lot of excess wallpaper, try getting creative with it. You can use it to line the inside of a cabinet or drawers, for example.

To determine how many rolls of peel-and-stick wallpaper you need, measure the square footage of the walls you’re covering and divide that by the square footage that each roll covers. Add 10% to 20% of your total square footage to account for pattern matching or damage while installing.