Checklist: Moisture Problems in the Attic and Roof
Insulation, airtightness and good roof repair are key to prevent moisture problems in the attic and roof.
- Ice dams along roof eave.
- Condensation, frost, black stains and mould on roof trusses and sheathing inside attic.
- Condensation and black stains near vents or plumbing stack.
- Condensation and black stains near wiring or electrical fixtures.
- Water dripping from soffits.
- Interior damage to ceiling (blistering paint, black staining, water leaks, bulging drywall).
- Water dripping from ceiling electrical fixtures.
- Ice dams that back water up under shingles and into the attic.
- Gaps and cracks in ceiling around ducts, framing, pipes, electrical wiring and fixtures that allow warm moist air to escape to the attic where it condenses.
- Missing chimney fire stop.
- Kitchen and bathroom exhaust fans vented into attic.
- Gaps between ceiling and partition walls in attics of row housing units.
- Leaking roof.
- Leaky, uninsulated ducts in attic.
- Carefully seal all penetrations running through the ceiling into the attic to prevent warm moist house air leaking into the attic.
- Seal and insulate attic hatch.
- Install and seal chimney fire stop around chimney to reduce air leakage into attic.
- Vent all exhaust fans directly outside.
- Seal light fixtures.
- Repair roof and flashings.
- Reduce excess humidity levels in the house.
- Seal and insulate ducts passing through attic.
- Seal joint between partition wall and ceiling in the attics of row housing units.
- Insulate attic to prevent snow from melting on roof.
- Install waterproof membrane over roof sheathing at the eaves when shingles are replaced.