Roof Is Damp In Attic

Buckled or damaged roof sheathing.

Roof is damp in attic.

The source of the attic moisture is usually indoor air that enters the attic through ceiling cracks. The cause depends on whether you have an unconditioned attic or a conditioned attic. Most people assume this is caused by a leaking roof but that might not be the source. Moisture or frost on the roofs sheathing.

A roof timbers within an attic can become damp from two sources. Moist or wet insulation. Fixing this issue can be less costly than replacing a roof but it should be addressed as soon as possible. Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest.

Noticeable musky damp odor. There are dozens of things that can cause condensation buildups in the attic one of which is a leaking roof. Water found in these places is commonly caused by condensation in the attic. Even a small pin head sized hole can send gallons of water pouring into your attic over the course of a couple months.

Common causes of condensation in the attic. If attic air is humid and roof sheathing is cold condensation or frost can accumulate on the underside of the sheathing. The typical expected cause is water penetration from the exterior due to a defective roof covering. This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate.

Water or drip marks scattered on the attic floor. And to make matters worse these holes are not easily identified unless it s raining. Moisture frost and ice buildup on roofing nails.