Moisture/air beneath the paint film is now trapped. When the painted surface is heated by the sun, the moisture/air expands and blisters form because it cannot escape freely. Blistering is often quite severe on exterior weatherboards facing north or west because of this situation.
Why Does Paint Bubble on Exterior?
Paint bubbling on exterior walls is a common problem caused by various factors. This issue can be unsightly and may need to be addressed to avoid further damage to the paint and walls. Understanding why paint bubbles can help prevent it from happening in the future and maintain the condition of your home.
Moisture is one of the most common causes of paint bubbling on the exterior of homes. Moisture from rain, humidity, or high water levels in the soil can cause paint to bubble on walls. The moisture can either come from the atmosphere or from the ground itself. If the walls are not properly sealed, water can seep into the walls and cause paint to bubble. This is especially true in areas with high levels of humidity. To prevent this, homeowners should make sure all walls are properly sealed and be sure to check for any leaks.
Temperature is also a factor in paint bubbling. If the temperature of exterior surfaces is too high, then it will begin to cause the paint to bubble. In particular, hot sunny days can cause paint to bubble, as the wall’s temperature will be much warmer than on cooler days. This happens because the heat causes the paint to expand, which can cause it to bubble
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