Part of Ward Property Services UK LtdTwo sleeping adults release around a litre of moisture into a bedroom overnight. In a room heated only in the evening, on an exposed north-facing corner, with a wardrobe against the external wall, that moisture has nowhere to go but the coldest surface available. That is why bedroom mould appears in such predictable places: behind furniture, in the top corners and on the window reveals.
Solutions are usually a combination of small things rather than one big intervention: a trickle of continuous background ventilation, keeping the room above about 16°C rather than letting it swing, moving furniture a few centimetres off the wall, and where cold bridging is severe, an insulating upgrade to the reveal or corner. We assess and advise on the mix that will work for your room.
Common signs
- ✓ Mould in the upper corners of an external wall
- ✓ Damp, cold patches behind a wardrobe or headboard
- ✓ Musty smell in stored clothing and bedding
- ✓ Streaming windows every morning through winter
- ✓ Mould on the ceiling line above the curtain pole
Likely causes
- • Overnight moisture production with the door and windows closed
- • Intermittent heating leaving surfaces below dew point
- • Thermal bridging at corners, lintels and window reveals
- • Furniture blocking air movement against cold walls
- • Blocked trickle vents in replacement windows