Who this guide is for
- Homeowners with bubbles or blisters in their wallpaper
- People preparing to brief a decorator, or a professional if damp is suspected
- Anyone unsure whether the bubbling is trapped air or moisture
- Owners wanting a clear record before redecorating
Reading the bubbles
Note the size, number and spread of the bubbles, whether they are scattered or clustered, and whether they feel dry and papery or damp and soft. A bubble that grows or feels damp behind is worth flagging.
Describe what you observe rather than piercing a bubble to test it.
- Small scattered bubbles from hanging
- A cluster that is spreading
- A bubble that feels damp or soft
- Bubbles in a damp-prone area
Trapped air versus moisture
Bubbles present since the paper was hung, stable and dry, often relate to the hanging itself. Bubbles that appear later, grow, or sit on external walls and damp-prone spots can point to moisture.
Record when the bubbling appeared and whether it is changing.
Location and conditions
Map which walls and rooms bubble, noting external walls, chimney breasts, bathrooms and kitchens. Note whether the wall behind feels cool or damp and whether there is a musty smell.
Record any condensation or humidity in the room.
Photographing without piercing
Photograph the bubbles in raking light so they show, close and wide, and keep dated images if they spread. Do not pierce or cut a bubble to test it, and avoid re-pasting if damp is suspected.
Note the room and the walls affected.
- Raking light shows the bubbles
- Date images to track spread
- Do not pierce; avoid re-pasting if damp is suspected
Briefing a professional
Bring your photos, the timing, and any moisture signs before contacting a decorator, or a damp professional if you suspect moisture.
Let them establish whether it is a hanging issue or a damp wall; your record helps them focus.
Documentation checklist
- 1Record the size, number and spread of the bubbles
- 2Note whether they feel dry and papery or damp and soft
- 3Record when the bubbling appeared and whether it is growing
- 4Map affected walls and rooms, noting damp-prone spots
- 5Check whether the wall behind feels cool or damp
- 6Note any musty smell, condensation or humidity
- 7Photograph in raking light, close and wide, dated
- 8Do not pierce the bubbles; avoid re-pasting if damp is suspected
Common mistakes to avoid
- Piercing or cutting a bubble to test it before recording the pattern
- Re-pasting bubbled paper before checking whether the wall is damp
- Assuming all bubbles are trapped air when some grow with moisture
- Ignoring a cool, damp wall behind a spreading cluster
- Treating clustered bubbling in wet rooms as purely cosmetic
When to involve a professional
- A decorator can assess and re-hang bubbled wallpaper, and where damp is suspected a professional should assess the wall first
- If the wall behind feels damp, have a professional check for moisture before redecorating
- Do not seal or re-paper a damp wall, as that can trap moisture and the bubbling will recur
- What is involved varies by wall and cause, and a professional should confirm
Frequently asked questions
Questions readers ask about this topic
What is the difference between bubbling and peeling wallpaper?
Bubbling is a blister in the face of the paper, while peeling is loss of adhesion at the seams and edges, and they can have different causes. Recording which you have helps a decorator or professional respond appropriately.
Are wallpaper bubbles always a moisture problem?
Not always — many are trapped air or paste from hanging and stay dry and stable. Bubbles that appear later, grow, feel damp, or sit on damp-prone walls are more worth flagging for a professional.
Should I pop the bubble to fix it?
Piercing a bubble before recording the pattern can spread a problem and, if moisture is behind it, will not address the cause. Photograph it as found, note whether it feels damp, and let a professional advise.
Which walls are most likely to bubble from damp?
External walls, chimney breasts, and walls in bathrooms and kitchens are more damp-prone. Bubbling clustering there, especially if it feels damp behind, is worth flagging and having a professional check for moisture.
Keep reading