Bedroom damp: condensation on walls overnight
Sources awaiting check
Condensation and dew-point checker
Worked example
For a room at 20°C and 60% relative humidity, with window glass measuring 11°C:
- Dew point: 12°C.
- The glass is 1°C below the dew point, so condensation is likely on it.
- First steps: open the trickle vents, wipe the glass each morning, and dry washing outdoors or in a ventilated room.
Source: Alduchov and Eskridge (1996), Journal of Applied Meteorology, awaiting check; NHS, awaiting check
Editor: brief §7 #22. Breath overnight in a closed room. Free fixes first. Every claim sourced; no health claims (link NHS); no "we tested"; note four-nation differences where they apply.
Why bedrooms
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Free fixes
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If it keeps happening
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FAQs
Editor: 4–6 FAQs from the keyword set.
Related guides
- Why are my windows wet in the morning?Why windows get wet overnight, what the dew point has to do with it, and the free fixes that stop it. With a dew-point checker for your own readings.
- Mould behind furniture and in wardrobes: why it happensWhy mould grows behind wardrobes, beds and sofas on outside walls, and the simple changes that stop it.
Sources
- Magnus formula coefficient a (over water) (Alduchov and Eskridge (1996), Journal of Applied Meteorology), awaiting check
- Magnus formula coefficient b (°C) (Alduchov and Eskridge (1996), Journal of Applied Meteorology), awaiting check
- NHS guidance on damp and mould and your health (NHS), awaiting check
- Energy Saving Trust advice on condensation and ventilation (Energy Saving Trust), awaiting check