Blistering Paint
What is Blistering Paint?
Blistering paint is the separation or peeling of paint film from a substrate, resulting in raised, bubble-like protrusions. It occurs when moisture becomes trapped between the paint and the surface it is applied to.
What Causes Blistering Paint?
The most common cause of blistering paint is moisture. This can come from several sources, including:
- Water from the ground: This can be caused by poor drainage, leaks in plumbing, or rising moisture through the foundation.
- Condensation: This occurs when warm, moist air comes into contact with a cold surface, such as an exterior wall.
- Excessive dampness: This can be caused by poor ventilation, high humidity, or the use of a moisture-retentive paint.
How to Determine if Paint Blistering is Due to Moisture
To determine if paint blistering is due to moisture, a moisture test should be conducted. This involves:
- Placing a moisture meter against the affected area: A moisture meter measures the electrical resistance of the surface, which increases when moisture is present.
- Cutting a small incision in the paint: If water or moisture is present, it will seep out of the incision.
- Removing a small section of paint: If the paint easily peels away from the substrate, it indicates the presence of moisture.
What to Do if Paint is Blistering Due to Moisture
If moisture is the cause of blistering paint, steps should be taken to address the source of moisture. This may involve:
- Improving drainage: Ensuring that water does not accumulate around the foundation or exterior walls.
- Repairing leaks: Identifying and fixing any leaks in plumbing or the roof.
- Improving ventilation: Increasing airflow through the home by installing exhaust fans or opening windows.
- Using moisture-resistant paint: Applying a paint specifically designed to resist moisture and prevent blistering.
Additional Tips
In addition to addressing the source of moisture, the following tips can help prevent blistering paint:
- Allow ample drying time: Ensure that paint is completely dry before applying a second coat.
- Avoid painting in cold or humid weather: These conditions promote condensation and moisture retention.
- Prime the surface: Applying a primer creates a surface that is less likely to absorb moisture.
- Use a vapor barrier: Installing a vapor barrier between the paint and the substrate can prevent moisture from entering the paint film.