Frost On Underside Of Roof Sheathing

When the moisture gets into the attic it condenses on the roof sheathing in the form of frost.

Frost on underside of roof sheathing.

The problems you pointed out are certainly real and need repair but getting the underside of the decking frosted requires vapor. Frost itself doesn t do any damage but once it melts things get wet and then damage occurs. The frost itself doesn t do any damage but once it melts things get wet which is when the damage. Picture a cloud of moisture floating overhead between the rafters.

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. When it reaches the cold surface of the roof sheathing and framing it turns to frost. 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. Water vapor is migrating upward and eventually filtering into the attic.

That excess moisture ends up as drops of condensation on the roof. Essentially condensation occurs at night when the temperature inside a building is warmer than outside. He wondered if that could be the cause. Melting frost can lead to deteriorated roof sheathing mold on the roof sheathing wet insulation and water stains on the ceilings.

Don t rinse or wipe the bleach solution from the sheathing after cleaning. Frost comes from air leaks. Depending on the temperature and the insolation ie. Frost on underside of roof sheathing it s more likely a vapor problem than a liquid water problem.

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. After several years of this there may be. 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.

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. As it cools it can t hold as much moisture. Combine 1 2 cup chlorine bleach with 1 gallon of water and use a sponge or cleaning brush to scrub the mold.