High Humidity In Attic

If water is running down the window or objects seem wet to the touch then the humidity is far too high.

High humidity in attic. However you need to have a specific dehumidifier for the job. At 140 f 80 humidity corresponds to 120 torr or 16 of atmospheric pressure. That s way too high. The dew point and rh stay below 70 f and 70 at their peak the peak of humidity not the peak height in the attic.

This is exactly how water accumulates in your gas tank by the way the scientist next door. High humidity in attic. You should focus first on preventing moisture and warm air from entering the attic from the living space. Humidity inside a home should be maintained between 30 and 60 relative humidity.

Sealing attic hatches duct work recessed lighting venting bath fans to exterior etc. That along with proper insulation should take care of the moisture problem. During the winter months the recommended relative humidity inside a house is anywhere between 30 50 percent. If there is excessive moisture accumulation in your attic it will condense on cold areas mainly on the underside of your roof deck.

You can check the humidity level by observing the windows and the objects in the attic. The dew point and rh get up close to 90 f and 90. The normal indoor humidity range in winter should be 15 to. So compared to that hot humid attic the vapor pressure at the other side of the foam is a factor of six higher.

In contrast the humidity near the ridge in the attic gets very high. High humidity means greater chances for mold to grow. If the attic is at 80 f and 80 humidity that s about a 21 torr vapor pressure of water. To alleviate high humidity you need to have the best dehumidifier for an attic that can prevent the excess moisture from flowing in.

Jason advani has insulated his attic with spray polyurethane foam and while his heating bills have dropped high humidity remains a problem. As planned the r 40 worth of insulation has drastically reduced his heating bill but now he faces another unexpected problem. Attics can get hot and humid during the summer especially when the outside air leaks in. By scott gibson march 18 2019.

Causes of high indoor relative humidity low heat load short equipment run time system oversizing. Outside air moves into the attic leaves its moisture behind amd moves on. I like to shoot for 50 in humid climates when possible and by possible i mean financially feasible for the customer because anything is possible.