Attic Humidity Levels

During the spring summer and fall relative humidity rh in a spray foamed attic often exceeds the comfort threshold of 60.

Attic humidity levels.

Proper ventilation will help maintaining a constant temperature in your attic. If there is excessive moisture accumulation in your attic it will condense on cold areas mainly on the underside of your roof deck. The normal indoor humidity range in winter should be 15 to. A hygrometer is a small gadget that measures the relative humidity level and temperature quickly and easily.

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. When it exceeds that threshold by too much and for too long you could experience problems like mold growth. 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.

If water is running down the window or objects seem wet to the touch then the humidity is far too high. According to the environmental protection agency epa indoor humidity levels should be kept below 60 percent relative humidity and ideally between 30 and 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. 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. High humidity means greater chances for mold to grow. You can check the humidity level by observing the windows and the objects in the attic. When it comes to humidity you would be best to have the levels below 50 to avoid mold growth and structural rot.