Condensation is the single largest source of moisture that can cause unwanted dampness in walls. It occurs when warm, moist air comes into contact with a colder surface, such as a wall, and the water vapor in the air condenses into liquid water. This moisture can accumulate over time and cause a variety of problems, including mold, mildew, and rot. Moisture levels vary greatly by climate. In dry climates, moisture levels range from 10% to 20% relative humidity. Less than 20% will cause dryness in the air. In humid climates, levels range from 50% to 80% relative humidity.

How much moisture is OK in walls?

The amount of moisture that is acceptable in walls varies depending on the climate and the construction of the home. However, as a general rule, the moisture content of walls should not exceed 15%. Higher levels of moisture can lead to the growth of mold and mildew, which can cause health problems for occupants.

What are the signs of condensation in walls?

There are a number of signs that may indicate that condensation is occurring in your walls, including:

• Damp or wet patches on walls or ceilings
• Musty or moldy odors
• Black or green mold growth on walls or ceilings
• Peeling paint or wallpaper
• Buckling or warping of walls or ceilings

How can condensation in walls be prevented?

There are a number of things that can be done to prevent condensation in walls, including:

• Increasing ventilation in the home by opening windows and doors, or using fans or air conditioners.
• Reducing the amount of moisture in the air by using a dehumidifier.
• Insulating walls and ceilings to prevent warm, moist air from coming into contact with cold surfaces.
• Sealing air leaks around windows and doors.

What are the consequences of ignoring condensation in walls?

Ignoring condensation in walls can lead to a number of serious problems, including:

• Mold and mildew growth, which can cause health problems for occupants.
• Rot and decay of walls and ceilings.
• Structural damage to the home.

If you suspect that there may be condensation in your walls, it is important to take action to address the problem as soon as possible. A qualified contractor can help you identify the source of the condensation and recommend the best course of action to prevent further damage.