The short answer
How Water Gets Behind the Paper
Drywall consists of a gypsum core sandwiched between layers of paper. When water seeps through the paper or enters from behind, it weakens the adhesive that holds the layers together. This causes the paper to lift and form bubbles or blisters on the surface.
The most common culprits are active leaks, such as a dripping pipe inside a wall, a roof leak that travels down, or an overflowing fixture. Even high indoor humidity can cause surface condensation on cooler walls, leading to bubbling over time. Identifying the moisture source is the first step.
Signs of a Moisture Problem
You might notice small bubbles, peeling paint, or a soft, spongy feel when you press on the wall. Discoloration or a musty odor can also accompany the bubbles. These signs often mean the drywall has absorbed water and the damage is spreading.
If you catch it early, you may be able to dry the area and repair the surface. But if the drywall stays wet, the gypsum can crumble and the paper can tear. In that case, the affected section usually needs to be cut out and replaced.
- Blisters or bubbles on the wall surface
- Paint that peels or flakes away
- Soft spots that give when pressed
- Dark stains or water rings
- Musty smell near the wall
- Warping or sagging of the drywall
What to Do When You Spot Bubbles
First, stop the source of water if you can safely do so. If it's a plumbing leak, shut off the water supply to that area. If it's a roof leak, place a bucket to catch drips and protect your floor. Then, remove any wet furniture or belongings from the area.
Next, dry the space as much as possible. Open windows, use fans, and run a dehumidifier if you have one. But remember that water can travel inside walls and behind drywall, so surface drying may not be enough. A water damage inspection can help find hidden moisture.
When to Call the Pros
If the bubbling covers a large area, if the drywall feels soft or crumbles, or if you suspect water has been sitting for more than a day or two, it's time to call in local water damage pros. They have moisture meters and drying equipment that can reach behind walls.
The pros will often remove the damaged drywall, dry the framing, and replace the affected sections. They also check for mold, which can develop quickly in wet drywall. Acting fast reduces the chance of more extensive repairs and health concerns.
Preventing Future Bubbling
Regularly inspect your home for leaks, especially around windows, roofs, and plumbing fixtures. Keep gutters clean and ensure downspouts direct water away from your foundation. In humid areas, use exhaust fans in bathrooms and kitchens to reduce moisture levels.
If you live in Mesa, know where your main water shutoff valve is located. That way, you can quickly stop a burst pipe from soaking your walls. Also, check your home's humidity levels and consider a dehumidifier if you notice condensation on walls.
Talk to someone now
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (480) 898-4279Frequently asked questions
Can I just paint over bubbled drywall?
Painting over bubbles won't fix the problem, and the bubbles will likely reappear. The moisture must be gone and the damaged paper removed or repaired. If the drywall is soft or crumbling, you need to replace that section before painting.
How long does it take for drywall to dry after a leak?
Drying time varies based on the amount of water, humidity, and airflow. Surface drying may take a few days, but moisture inside walls can linger much longer. Professional drying equipment speeds up the process and helps prevent mold growth.
Is bubbled drywall a sign of mold?
Bubbling itself doesn't mean mold is present, but the moisture that caused it can lead to mold. If the area has been wet for more than 24 to 48 hours, mold can start to grow. If you see or smell mold, a mold professional should assess the situation.