Key takeaways
- Good airflow protects shingles and insulation.
- Hot upstairs rooms can be a clue.
- Damp insulation and stained wood point to moisture.
- Blocked soffits are a common culprit.
Roof lifespan is not only about what is on top. What happens in the attic matters just as much.
Signs of poor ventilation
- Upstairs rooms that stay hot
- Damp or compressed insulation
- Stains or fuzzy growth on the underside of decking
- Rusty nail tips in the attic
- Shingles that curl or blister early
- Frost or condensation on the decking in cold weather
Common causes
- Blocked soffit vents
- Too few exhaust vents
- Bathroom or kitchen fans venting into the attic
- Insulation pushed against the roof deck
Ventilation is about balance: air coming in low and out high. We check both ends.