Which exterior paints are not vapor permeable?

Most modern exterior paints are formulated to be vapor permeable, allowing water vapor to escape from the surface of the walls. However, some types of paint, such as oil-based paints or certain types of epoxy coatings, may not be as vapor permeable as other types of paint.

Oil-based paints are generally less vapor permeable than water-based paints and can sometimes trap moisture within the walls, leading to problems like peeling, cracking, or bubbling. Similarly, some types of epoxy coatings, which are often used in industrial or commercial settings, may not be vapor permeable.

It’s important to note that using a non-vapor permeable paint on exterior walls can cause problems with moisture retention and damage to the structure, so it’s generally recommended to use a paint that allows for vapor permeability. If you’re unsure about which type of paint to use for your specific project, it’s always best to consult with a professional painter or contractor.

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