Found these strange bubbles forming under the paint on my wall near the floor. They feel soft to the touch and seem to be getting bigger—is this a reaction to humidity or something worse?

First, reduce humidity levels in the room by using a dehumidifier or increasing ventilation. If you suspect a leak, turn off the water supply to the affected area and contact a plumber. For rising damp, consider installing a damp-proof course to prevent further moisture ingress.

Temporarily remove the bubbling paint to allow the wall to dry out. This will prevent further damage and mold growth until permanent repairs can be made.

Professionals use a combination of tools and techniques to diagnose moisture problems. Thermal imaging cameras can detect temperature differences that indicate moisture presence. Moisture meters provide precise readings of the moisture content in walls and floors.

In some cases, professionals might remove a small section of drywall to visually inspect for leaks or mold. They may also employ pressure tests to determine if plumbing leaks are contributing to the problem.

For minor bubbling due to humidity, improving ventilation and repainting with moisture-resistant paint might suffice. Remove the affected paint, allow the wall to dry completely, and apply a primer before repainting.

For issues like leaks or rising damp, more extensive repair work may be necessary, such as fixing plumbing leaks, installing a damp-proof membrane, or even opening up the wall to repair structural damage and replace insulation.

Ensuring proper ventilation in areas prone to high humidity, such as bathrooms and kitchens, can prevent future bubbling. Consider installing exhaust fans or opening windows to improve air circulation.

Waterproofing measures, such as sealing the exterior of your home, maintaining gutters and downspouts, and applying waterproof coatings to walls, can also help prevent moisture ingress. Regular inspections and maintenance are key to keeping your walls bubble-free.