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?
Paint bubbles, or blisters, occur when the paint film lifts from the underlying surface. This is typically due to a loss of adhesion and can be caused by several factors including moisture, heat, or a reaction between the paint and the surface beneath it. In many cases, these bubbles are filled with moisture or air, making them feel soft to the touch.
When paint is applied to a wall that is not completely dry or has moisture trapped underneath, the increase in pressure from the moisture can cause the paint to form bubbles. This is often exacerbated in areas where the humidity levels are high or in spaces with poor ventilation. The size and frequency of the bubbles can vary, and they may appear as small as 1/8 inch in diameter or grow to several inches across.
2. How To Tell If It’s Just Humidity Or A Bigger Problem
To determine if the bubbling is purely a result of humidity or if there is a more significant problem, start by assessing the environment. Measure the humidity levels in the room using a hygrometer; levels above 60% can contribute to paint bubbling due to excess moisture in the air.
Examine the location of the bubbles. If they are concentrated near a water source, such as a bathroom or kitchen, humidity might be the culprit. However, if the bubbles are widespread or located on interior walls away from water sources, this could indicate a leak within the wall or rising damp from the floor.
