High Humidity In Attic

Proper ventilation will help maintaining a constant temperature in your attic.

High humidity in attic. High humidity means greater chances for mold to grow. 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. However you need to have a specific dehumidifier for the job. The dew point and rh get up close to 90 f and 90.

If there is excessive moisture accumulation in your attic it will condense on cold areas mainly on the underside of your roof deck. Jason advani has insulated his attic with spray polyurethane foam and while his heating bills have dropped high humidity remains a problem. That along with proper insulation should take care of the moisture problem. Sealing attic hatches duct work recessed lighting venting bath fans to exterior etc.

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. At 140 f 80 humidity corresponds to 120 torr or 16 of atmospheric pressure. Humidity inside a home should be maintained between 30 and 60 relative humidity. High humidity in attic.

That s way too high. To alleviate high humidity you need to have the best dehumidifier for an attic that can prevent the excess moisture from flowing in. Humidity settings are another issue that can make or break the performance of your heating and cooling systems and your attic ventilation. This is exactly how water accumulates in your gas tank by the way the scientist next door.

In contrast the humidity near the ridge in the attic gets very high. By scott gibson march 18 2019. You can check the humidity level by observing the windows and the objects in the attic. 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.

If water is running down the window or objects seem wet to the touch then the humidity is far too high. During the winter months the recommended relative humidity inside a house is anywhere between 30 50 percent. So compared to that hot humid attic the vapor pressure at the other side of the foam is a factor of six higher. You should focus first on preventing moisture and warm air from entering the attic from the living space.

Causes of high indoor relative humidity low heat load short equipment run time system oversizing. Attics can get hot and humid during the summer especially when the outside air leaks in. Outside air moves into the attic leaves its moisture behind amd moves on.