| Heavy soot | Restricted airflow, improper combustion, or previous use | May warrant cleaning and further evaluation |
| Creosote | Wood-burning byproducts that can create fire hazards | May warrant professional chimney sweeping |
| Stuck damper | Corrosion, debris, or damaged operating mechanism | May warrant repair or replacement |
| Missing damper clamp where applicable | Missing safety feature for vented gas logs | May warrant installation by a qualified professional |
| Missing rain cap | Unprotected flue opening | May warrant installation to reduce water intrusion |
| Missing spark screen | Unprotected opening | May warrant installation to reduce debris and animal entry |
| Cracked chimney crown | Weathering, movement, or age | Maintenance or sealing may be considered |
| Brick cracking | Settlement, movement, or weathering | Larger cracks may warrant further evaluation |
| Loose mortar | Age-related deterioration or moisture | May warrant pointing or repair |
| Firebox deterioration | Heat exposure, age, or moisture | May warrant repair depending on extent |
| Rust | Moisture intrusion or aging | May warrant further evaluation to determine the moisture source |
| Loose chimney components | Weathering, failed attachment, or age | May warrant repair to ensure stability |