Wet Sheathing In Attic

There are many signs that an attic is wet.

Wet sheathing in attic.

Trapped water will boil when the sun heats the roof and the shingles will then have small pits where. Often this is first noticed when re shingling. Moisture or frost on the roofs sheathing. It is never a good idea to install a roof over wet plywood or any type of roof sheathing.

Mold on attic sheathing. Wet sheathing was found in attic area due to lack of venting. Water leaks are more obvious as telltale signs such as darkened water stains evidence of mold on the ceiling inside the house or wet sheathing. Attics can suffer two types of leaks.

If you have ceiling leaks only in the spring it may be that ice has been forming on the sheathing all winter and it suddenly melts when a warm spell arrives. In the vast majority of cases the mold growth is caused by condensation. This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate. Moist or wet insulation.

The osb and in fact any wood panels must be allowed to dry completely depending on how wet the panels are this could be a few days before any roofing material is applied to avoid trapping moisture under the roof material that could cause edge swell and buckling. Water or drip marks scattered on the attic floor. Buckled or damaged roof sheathing. Prolonged wetness will rot out the roof sheathing.

How does condensation get in the attic. Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest.