Overview
Condensation on the inside face of a composite door is usually a humidity problem in the hallway, not a door problem. The exception is condensation inside the glazing unit - that's a failed sealed unit needing replacement.
Symptoms
- Water droplets on inside of door.
- Mould near the door.
- Misting inside the glass.
Common causes
- High indoor humidity.
- Cold door surface + warm humid air.
- Failed sealed glazing unit.
When to call a professional
- Sealed glazing unit replacement.
Prevention
- Trickle vents open.
- Extractor fans in kitchen/bathroom.