Attic Humidity Levels Mold

If there is excessive moisture accumulation in your attic it will condense on cold areas mainly on the underside of your roof deck.

Attic humidity levels mold. If water is running down the window or objects seem wet to the touch then the humidity is far too high. By scott gibson march 18 2019. If you ve got a spray foamed attic and you ve got high humidity here s how to fix it for good. Indoor relative humidity rh should be kept below 60 percent ideally between 30 percent and 50 percent if possible.

Humidity settings are another issue that can make or break the performance of your heating and cooling systems and your attic ventilation. When it exceeds that threshold by too much and for too long you could experience problems like mold growth. An air conditioner or dehumidifier will help you keep the level low. The normal indoor humidity range in winter should be 15 to.

Jason advani jason advani thought he was on the right track when he insulated the bottom of the roof deck in his walk up attic with closed cell spray foam. While damp and warm climates are a prime breeding ground for our fuzzy friend other conditions that bring mold include lack of ventilation and proper sheathing. Sometimes humidity or dampness water vapor in the air can supply enough moisture for mold growth. High humidity in a space like an attic can lead to mold and a spill in a carpeted area of your home that isn t quickly taken care of can also lead to mold under the carpet.

Mold in a house is caused by humidity and dampness. During the spring summer and fall relative humidity rh in a spray foamed attic often exceeds the comfort threshold of 60. During the winter months the recommended relative humidity inside a house is anywhere between 30 50 percent. Jason advani has insulated his attic with spray polyurethane foam and while his heating bills have dropped high humidity remains a problem.

At 75 degrees fahrenheit 65 rh there is no risk for mold. High humidity means greater chances for mold to grow. To prevent mold from growing in your attic do the following. Keep humidity levels as low as you can between 30 and 50 all day long.

The dynamic relationship between temperature and humidity is why it can be confusing and why people need a chart or app for that. You can check the humidity level by observing the windows and the objects in the attic. Proper ventilation will help maintaining a constant temperature in your attic. Low humidity may also discourage pests such as cockroaches and dust mites.

Mold can grow inside if the weather has been rainy or humid for many days in a row and may not need a flood or water damage to occur. Bear in mind that humidity levels change over the course of a day with changes in the moisture in the air and the air temperature so you will need to check the humidity levels more than once a day.