6 Things to Understand About Condensation and Black Mould
Most household mould is condensation, and the treatments sold for damp do nothing about it because it is not what they address.
1. How it forms
Warm air holds more moisture than cool air. When it meets a cold surface it releases that moisture as liquid.
The cold surfaces in a home are external walls, window reveals, corners and anywhere behind furniture where air does not circulate.
Household activities generate a surprising volume of moisture daily: cooking, showering, drying clothes, and breathing.
2. Recognising it
Black spotted mould rather than a tide mark.
Worst in winter, in corners, behind wardrobes, around window frames and in bathrooms and bedrooms.
Water on the inside of glass in the morning.
It does not correlate with rainfall, which distinguishes it from penetrating damp.
3. The three levers
Reduce moisture production: lids on pans, extractor fans used during and after cooking and bathing, and clothes dried outside or in a vented or condensing dryer rather than on radiators.
Increase ventilation: trickle vents open, extractors that actually move air, and brief purge ventilation by opening windows wide for a few minutes.
Raise surface temperatures: consistent background heating and insulation, since a warm wall does not condense.
Doing one alone rarely solves it; the combination does.
4. Common mistakes
Sealing a house tightly without providing ventilation, which is how draughtproofing sometimes creates a mould problem.
Blocking air bricks or covering extractor vents.
Pushing furniture flush against external walls, which creates a cold, still pocket.
Treating the mould without changing the conditions, which guarantees its return.
5. Cleaning it safely
Wipe rather than brush, since disturbing spores spreads them.
Use an appropriate fungicidal cleaner and ventilate while working.
Wash affected fabrics; discard porous items that are heavily affected.
6. When it is not condensation
Localised patches that worsen after rain suggest a defect outside.
A tide mark at the base of walls with salt deposits suggests something different again.
Persistent mould despite good ventilation and heating warrants an independent survey by someone who does not sell treatments.
Final Thoughts
Most household mould is condensation, which no damp treatment addresses because it is not the problem being sold against. Reduce moisture, increase ventilation and raise surface temperatures together rather than one at a time.
Author: This article is general information only and does not constitute professional advice. Circumstances vary, and you should consult a qualified professional before making decisions based on this content.
Article Was Generated By AI.