Frost On Underside Of Roof Sheathing

That excess moisture ends up as drops of condensation on the roof.

Frost on underside of roof sheathing.

He recently had a new heat pump and aprilaire humidifier installed in basement. Melting frost can lead to deteriorated roof sheathing mold on the roof sheathing wet insulation and water stains on the ceilings. The frost itself doesn t do any damage but once it melts things get wet which is when the damage. When it reaches the cold surface of the roof sheathing and framing it turns to frost.

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. When the moisture gets into the attic it condenses on the roof sheathing in the form of frost. Can sun get to the roof you will have either frost or water collecting.

Don t rinse or wipe the bleach solution from the sheathing after cleaning. Essentially condensation occurs at night when the temperature inside a building is warmer than outside. Frost on underside of roof sheathing it s more likely a vapor problem than a liquid water problem. After several years of this there may be.

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

Water vapor is migrating upward and eventually filtering into the attic. 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. You definitely don t want frost in your attic. 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. The problems you pointed out are certainly real and need repair but getting the underside of the decking frosted requires vapor. Warm wet air rises and meets the cold roof and cools.