What Happens to Wallpaper After Water Exposure?

When wallpaper gets wet, the paper fibers absorb water and expand. That expansion causes the wallpaper to wrinkle and form bubbles. The adhesive behind the paper softens, so the wallpaper starts to pull away from the drywall. You may notice the edges curling within hours.

The longer the water sits, the worse the damage gets. If the wallpaper is vinyl-faced, the top layer may stay intact while water gets trapped underneath. That trapped moisture can lead to mold growth behind the surface, which you might not see until later.

Water leaves behind mineral deposits and dirt. Even after drying, you may see brown or yellow stains on the wallpaper. These stains are hard to remove without damaging the paper. Bleach can lighten some stains, but it can also fade the wallpaper's pattern.

If the water came from a clean source like a burst pipe, stains may be minimal. But if the water was dirty, like from a flood or sewage backup, the staining will be more severe. In that case, the wallpaper likely needs replacement.

Prevention is easier than repair. Fix leaky roofs, windows, and pipes promptly. Keep gutters clean to avoid water backing up. Controlling indoor humidity can also reduce the risk of moisture damage to wallpaper.

Know where your main water shutoff valve is. That way, you can stop a pipe break quickly. Also, consider using mold-resistant wallpaper in areas prone to moisture, like bathrooms. But no wallpaper is completely waterproof, so always address leaks fast.