Frost On Underside Of Roof Sheathing

When it reaches the cold surface of the roof sheathing and framing it turns to frost.

Frost on underside of roof sheathing. Frost on underside of roof sheathing it s more likely a vapor problem than a liquid water problem. He wondered if that could be the cause. The problems you pointed out are certainly real and need repair but getting the underside of the decking frosted requires vapor. The frost itself doesn t do any damage but once it melts things get wet which is when the damage.

A little bit of frost forming is not unusual after really low nighttime temperatures and it isn t a huge problem if it is able to melt and evaporate so that the wood can dry. After several years of this there may be. Combine 1 2 cup chlorine bleach with 1 gallon of water and use a sponge or cleaning brush to scrub the mold. Frost itself doesn t do any damage but once it melts things get wet and then damage occurs.

Water vapor is migrating upward and eventually filtering into the attic. Picture a cloud of moisture floating overhead between the rafters. That excess moisture ends up as drops of condensation on the roof. Frost and ice forms in attics when warm humid air accumulates and condenses on the underside of your roof sheathing.

Depending on the temperature and the insolation ie. Frost comes from air leaks. 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. 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.

As it cools it can t hold as much moisture. Melting frost can lead to deteriorated roof sheathing mold on the roof sheathing wet insulation and water stains on the ceilings. When the moisture gets into the attic it condenses on the roof sheathing in the form of frost. Don t rinse or wipe the bleach solution from the sheathing after cleaning.

Warm wet air rises and meets the cold roof and cools. Can sun get to the roof you will have either frost or water collecting. You definitely don t want frost in your attic.