If mould keeps coming back in your Preston bathroom — even after cleaning — the problem is almost always linked to excess humidity, poor extraction, cold surfaces or a lack of continuous ventilation. Bathrooms generate more moisture than any other room in the home, and without proper airflow, that moisture settles on cold tiles, ceilings and walls, creating the perfect environment for mould to grow again and again.
At Weather Wise Solutions Limited, we diagnose persistent bathroom mould across Lancashire and provide long-term ventilation solutions that actually stop it from returning.
🌬️ Why Bathroom Mould Keeps Coming Back
Bathroom mould is not just a cleaning issue — it’s a moisture control problem.
Here are the most common causes in Preston homes:
1️⃣ Weak or Ineffective Bathroom Extraction
Most mould problems start with a fan that either:
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isn't powerful enough
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only runs with the light
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turns off too quickly
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is blocked or clogged
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isn’t ducted correctly
When steam lingers after showers, condensation forms — and mould follows.
2️⃣ High Humidity Spikes After Showering
When hot steam hits cold surfaces, moisture instantly condenses.
If the fan doesn't extract the moisture continuously, it settles on:
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grout lines
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ceilings
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silicone seals
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window frames
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cold corners
This triggers rapid mould regrowth.
3️⃣ Cold Surfaces and Thermal Bridging
Bathrooms often have:
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cold external walls
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poorly insulated ceilings
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cold tiled surfaces
Cold surfaces accelerate condensation, which feeds mould.
4️⃣ No Whole-House Ventilation
A bathroom fan helps, but if the rest of the home lacks airflow, humidity has nowhere to go.
This makes condensation worse in winter and encourages mould.
5️⃣ Extractor Fan Not Running Long Enough
If the fan switches off when the light goes off, moisture stays trapped.
A DMEV (continuous extractor) solves this by running 24/7 at a low, quiet trickle rate.
🧰 How Weather Wise Diagnose Bathroom Mould in Preston
Our specialists carry out:
✔ Humidity and vapour pressure testing
To understand moisture behaviour.
✔ Fan performance checks
Ensuring correct extraction rates and ducting.
✔ Thermal imaging
Identifying cold bridging areas.
✔ Moisture mapping
Checking whether moisture is getting into the walls.
✔ Ventilation system suitability
Deciding whether DMEV, PIV or both are needed.
🛠️ Long-Term Solutions for Bathroom Mould
Depending on what we find, solutions include:
🔧 Install a DMEV Continuous Extract Fan
Runs quietly 24/7, removing moisture before it condenses.
🌬️ Add a PIV Unit for Whole-House Ventilation
Helps stabilise humidity levels throughout the property.
🧱 Insulate Cold Walls or Ceilings
Reduces cold surfaces that attract condensation.
🚿 Improve Airflow
E.g., opening trickle vents, adjusting door gaps, improving cross-ventilation.
🛠️ Seal or Repair Defects
Like leaky tiles, grout or window frames that hold moisture.
We use quality materials and systems from:
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PAM Ties – https://www.pamties.co.uk/
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Wycamol – https://wykamol.com/
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Builders Super Store
And our work follows industry best practice as members of:
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Federation of Damp – https://federationofdamp.co.uk/
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Damp Proofing Association – https://www.dampproofingassociation.co.uk/
Insurance-backed guarantees available for eligible work.
🏡 Why Preston Homeowners Trust Weather Wise
Weather Wise Solutions Limited is a family-run ventilation and damp specialist serving Preston and Lancashire.
We’re trusted because we offer:
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accurate diagnosis
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industry-approved solutions
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CPD-qualified specialists
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long-term prevention, not quick fixes
Find us on:
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TrustATrader:
https://www.trustatrader.com/traders/weather-wise-solutions-limited-damp-surveyor-newcastle-under-lyme -
Checkatrade:
https://www.checkatrade.com/trades/weatherwisesolutionslimited
📞 Book a Bathroom Ventilation Assessment in Preston
If mould keeps coming back in your bathroom, the problem isn’t the cleaning — it’s the ventilation.
We can identify the cause and provide a permanent, reliable solution.
Book your free survey here:
https://weatherwiseuk.co.uk/pages/contact