High Humidity Attic Winter

Attic insulation and ventilation go hand in hand.

High humidity attic winter.

A home with a healthy humidity level can have numerous benefits. If your home humidity level stays around 45 your living environment will be cleaner safer healthier. Why is that important. The normal indoor humidity range in winter should be 15 to 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. During the winter months the recommended relative humidity inside a house is anywhere between 30 50 percent. 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. For example if the indoor temperature is 70 degrees and the outdoor temperature is 20 degrees then the recommended humidity.

As planned the r 40 worth of insulation has drastically reduced his heating bill but now he faces another unexpected problem. Ideally a home should have a humidity level of about 45. If it dips below 30 it s much too dry and if it s above 50 the high humidity may start to feel uncomfortable. The results are that the attic temperature is close to the outside temperature but the relative humidity is significantly higher in the attic than either the indoor or outdoor readings.

Jason advani has insulated his attic with spray polyurethane foam and while his heating bills have dropped high humidity remains a problem.