Attic Humidity Levels

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. When it exceeds that threshold by too much and for too long you could experience problems like mold growth. Proper ventilation will help maintaining a constant temperature in your attic. Humidity settings are another issue that can make or break the performance of your heating and cooling systems and your attic ventilation. You can check the humidity level by observing the windows and the objects in the attic.

During the spring summer and fall relative humidity rh in a spray foamed attic often exceeds the comfort threshold of 60. High humidity means greater chances for mold to grow. The normal indoor humidity range in winter should be 15 to. The recommended humidity level for all rooms including the attic and crawl space in the winter is 30 to 40 percent in cold climates.

It s easy to measure the levels in your home by using a hygrometer. The moisture was rising with the warm air of the home as it escaped past the insulation and it was trapped in the attic because there was no roof ventilation. During the winter months the recommended relative humidity inside a house is anywhere between 30 50 percent. The short answer to this very involved question and the pages of temperature and humidity level data you sent is yes there is a risk that moisture from humid air in your attic will condense on.

If you ve got a spray foamed attic and you ve got high humidity here s how to fix it for good. The humidity in the basement measured 40 the first floor was 45 50 but the attic was 62. Winter air is by nature not humid so the problem must be condensation related. If water is running down the window or objects seem wet to the touch then the humidity is far too high.