Quick answer
Small bubbles right after hanging are often trapped moisture and usually flatten within a day or two as the paste dries. Bubbles that remain after 48 hours are caused by trapped air, dry spots without paste, paper that expanded after hanging, or a problem behind the paper such as old wallpaper, loose paint or moisture.
Key points
- Give new wallpaper 24–48 hours before judging small bubbles.
- Persistent bubbles usually mean a paste or surface problem.
- Hanging over old wallpaper is a common cause of later bubbles.
- Moisture from leaks or steam can cause bubbles months later.
Bubbles that usually go away
When wet paste meets a primed wall, some moisture is trapped under the paper. As it dries, the paper contracts slightly and pulls flat. Small, soft bubbles in the first few hours are normal, especially with traditional papers. Leave them alone for a day or two; pushing on them while wet can stretch the paper.
Bubbles that stay
Trapped air
If the strip was not smoothed from the center out, air pockets remain. These feel hollow and do not shrink as the paste dries.
Dry spots
On paste-the-wall papers, a missed spot on the wall leaves an area with no adhesive. On prepasted papers, parts of the backing may not have been fully activated.
Paper that was not booked
Traditional papers that go up before they have finished expanding keep growing on the wall, creating ripples and bubbles.
Old wallpaper underneath
When new wallpaper is hung over old, the moisture in the new paste can soak into the old layer and release it from the wall. The result is bubbles — sometimes large — that appear hours or days later. This is one of the main reasons we remove old wallpaper first.
Loose or glossy paint
If the paint under the paper is peeling, chalky or very glossy, the paper sticks to the paint but the paint lets go of the wall. A wallcovering primer prevents this.
Moisture
Bubbles that show up months after installation are often moisture: a slow leak, condensation on a cold exterior wall or steam in a bathroom without a working fan. Fix the moisture before fixing the paper.
How to fix a wallpaper bubble
- Wait 48 hours after installation to see whether it flattens.
- For a small air bubble, make a tiny slit with a fresh blade along a pattern line.
- Use a syringe or thin applicator to put a small amount of seam adhesive inside.
- Press flat with a soft smoothing tool from the center out, and wipe any adhesive off the surface with a clean damp sponge (not on grasscloth).
- For large bubbles, wide areas or bubbles caused by old paper, the strip may need to come off and the wall prepped properly.
Grasscloth, silk and other natural papers should not be wiped with water. If a bubble appears on a natural wallcovering, call a professional rather than trying a home fix.
Preventing bubbles
- Remove old wallpaper and wash off the adhesive.
- Repair and prime walls with a wallcovering primer.
- Follow the booking time for traditional papers.
- Smooth each strip from the center out with even pressure.
- Ventilate bathrooms and fix leaks before installing.
Bubbles vs blisters vs wrinkles
Not every raised spot is the same problem. A bubble is a pocket of air or moisture under an otherwise flat strip. A blister is usually a spot where the paper has separated because the surface underneath let go — old paper, loose paint or dust. A wrinkle or ripple running up a strip usually means the paper expanded after hanging or was not smoothed straight. Each one has a different fix, which is why we look before we cut.
Bubbles on peel-and-stick
Peel-and-stick wallpaper can trap air if it is applied too quickly or to a textured wall. Small bubbles can sometimes be pushed toward the nearest edge with a smoothing tool, or released with a pin prick and smoothed. Bubbles that keep returning usually mean the wall texture or paint is not suitable for self-adhesive paper.
When to call a professional
- Bubbles larger than a coin or spreading over time.
- Bubbles near seams that are also lifting.
- Bubbles on grasscloth, silk or metallic papers.
- Bubbles that appeared months after installation, especially near windows, bathrooms or exterior walls.
- Many bubbles across one wall, which points to a surface problem.
What we check on a bubble call
We press gently to see whether the bubble is soft (air) or crunchy (old paper or paint letting go), check seams nearby, and use a moisture meter if the location suggests water. That tells us whether a small injection repair will last or whether the strip needs to come off. If you are planning new wallpaper and want to avoid all of this, our wall prep service starts with the surface.
FAQ
Will wallpaper bubbles go away on their own?
Small bubbles from moisture usually flatten within 24–48 hours. Bubbles that remain after that need to be fixed.
Why is my wallpaper bubbling months later?
Late bubbles usually point to moisture, a failing paint layer or old paper underneath. Find the cause before repairing the paper.
Can I pop a wallpaper bubble with a pin?
For small air bubbles on many papers, a pin prick and gentle smoothing can work. Do not try it on natural or specialty papers, and do not press a bubble while the paper is still wet.
