Understanding Relative Humidity

Relative humidity (RH) is a crucial factor in maintaining a comfortable and healthy indoor environment. It measures the amount of water vapor in the air relative to the maximum it can hold at a specific temperature.

What is a Moisture Test in a House?

A moisture test in a house measures the moisture content in building materials, such as wood, concrete, and drywall. This test is often conducted to identify potential moisture problems resulting in mold growth, structural damage, and poor indoor air quality.

Effects of High and Low Relative Humidity

• High RH: Above 55% RH can promote mold growth, damage building materials, and cause discomfort by making it harder for your body to cool itself.
• Low RH: Below 30% RH can cause dry skin, eyes, and throat, and damage wood furniture and musical instruments.

Ideal Relative Humidity Levels

For optimal comfort and health, it is recommended to maintain relative humidity levels between 30% and 55%. This range inhibits the growth of bacteria, viruses, and mold while reducing the risk of moisture damage.

Measuring Relative Humidity

Relative humidity can be measured using a hygrometer, a device that detects changes in the moisture content of the air. It can be a digital or analog device that displays RH as a percentage.

Controlling Relative Humidity

• Humidifiers: Add moisture to the air during dry periods.
• Dehumidifiers: Remove excess moisture from the air during humid periods.
• Proper Ventilation: Exchange indoor and outdoor air to moderate humidity levels.