HouseSymptoms field intelligence

Symptoms

Start with the visible, audible, physical or measurable sign—not the name of the fault.

Frost inside the attic

Frost on cold roof surfaces often reveals warm humid indoor air reaching the attic and freezing before it can dry.

Roof deck wetting is concentrated above the access opening.

Seasonal ceiling wetting or staining during cold weather.

Repeated dark spotting appears on the underside of the roof deck.

Small pellets or staining indicate animal activity.

Metal fasteners show frost during cold weather.

Fine snow accumulates near vents and later wets materials.