Bubble Paint on Wall
Bubble paint can be caused from a number of things.
Here are three.
1. If the bubble is on a flat painted wall, the bubble could be caused from water getting behind the drywall paper, swelling the paper and pushing it out.
As for these paint bubbles, just cut out the loose paint or paper just outside of the damage area where the surface is solid, sand any loose material, and skim them out.
2. A paint bubble on a semi painted wall may be from a water leak above. However, because semi paint does not let much water through it, water may travel behind the paint, loosening and causing the paint to bulge out.
The paint will seep down the wall behind the paint causing a “ripple” in the paint to go down the wall until the water comes to a seam where the it can escape. At this point, the bubble paint may swell out or bulge like a small bag containing water, until the water escapes through the seam, or breaks through the paint.
Do the same as mentioned above, just cut out the loose paint or paper just outside of the damage area where the surface is solid, sand any loose material, and skim them out.
There is a third possibility that may look like bubbled paint on the wall but could be a problem with the drywall.
3. During installation a careless contractor, may not have left the necessary clearance for drywall, forcing the drywall into place but causing a bump or bubbled area in the drywall.
To fix it, replace the bump area with a thinner drywall piece, or notch out the backside of a repair piece to conform to the object in the wall. Then repair your patch and sand it out to finish and blend it into the surrounding area