Frost On Underside Of Roof Sheathing

He recently had a new heat pump and aprilaire humidifier installed in basement.

Frost on underside of roof sheathing.

Frost and ice forms in attics when warm humid air accumulates and condenses on the underside of your roof sheathing. This latter phenomenon occurs when the house is too humid and the warm moist air seeps into the attic where it condenses and freezes on cold attic areas. Frost comes from air leaks. Water vapor is migrating upward and eventually filtering into the attic.

The frost itself doesn t do any damage but once it melts things get wet which is when the damage. Combine 1 2 cup chlorine bleach with 1 gallon of water and use a sponge or cleaning brush to scrub the mold. The problems you pointed out are certainly real and need repair but getting the underside of the decking frosted requires vapor. As it cools it can t hold as much moisture.

Frost itself doesn t do any damage but once it melts things get wet and then damage occurs. Picture a cloud of moisture floating overhead between the rafters. Don t rinse or wipe the bleach solution from the sheathing after cleaning. Can sun get to the roof you will have either frost or water collecting.

Melting frost can lead to deteriorated roof sheathing mold on the roof sheathing wet insulation and water stains on the ceilings. In the parlance of building scientists these cold wooden house parts make up a condensing surface much like a cold glass of ice tea beads with water on a hot summer day. Scosta steve costa february 20 2006 3 34pm 1 got a call to inspect an attic homeowner stated he hasn t gone up there in a long time when he was up there he noticed the underside of the roof sheathing had frost on it. Depending on the temperature and the insolation ie.

Essentially condensation occurs at night when the temperature inside a building is warmer than outside. You definitely don t want frost in your attic. Frost on underside of roof sheathing it s more likely a vapor problem than a liquid water problem. When the moisture gets into the attic it condenses on the roof sheathing in the form of frost.

He wondered if that could be the cause. That excess moisture ends up as drops of condensation on the roof. Warm wet air rises and meets the cold roof and cools.