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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.

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. 

How long peel-and-stick wallpaper lasts depends on a few factors, including the conditions in the room, the quality of the wallpaper, and the wallpaper's application. As a general rule, peel-and-stick wallpaper can last for at least five years, but you may decide to remove it sooner. Under ideal conditions, it can also last for much longer.

Factors that may shorten the lifespan of peel-and-stick wallpaper include high humidity in a room (such as a bathroom), dirty walls, and low-quality paper.

Most experts would not recommend hanging wallpaper over existing wallpaper more than twice. Even if the walls are in good condition and primed well, that third layer of wallpaper could cause problems with adhesion. Unless you like bubbling paint and peeling wallpaper as an interior design choice, it’s better to remove at least one existing layer before adding any more to a wall.