DAMP GUYDAMP SPECIALIST · CUMBRIAFree survey
DAMP GUYDAMP SPECIALIST · CUMBRIA

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TOUGH ON DAMP.

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CAUSES, PREVENTION & TREATMENT

BATHROOM MOULD
IN CUMBRIAN HOMES.

Black spots on the ceiling, in the grout or around the window that come back however often you clean them? Here’s why it happens and how to stop it returning.

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Written and reviewed by Damp Guy, damp and plastering specialists in Cumbria for 8 years ·

Why it keeps
coming back.

A single shower releases a lot of moisture into a small room. If that steam isn’t removed quickly, it condenses on the coldest surfaces, often ceiling corners, outside walls and window reveals, and mould follows.

Extraction that isn’t doing its job

Many bathroom fans are too small, clogged with dust, badly ducted or switched off too soon. Some vent into the loft instead of outside, which moves the problem rather than solving it.

Cold corners & ceilings

Where insulation is thin or missing, ceilings and outside walls stay cold enough for steam to condense on them every day. That’s where mould appears first.

Hidden leaks

Failed sealant, cracked grout or a leaking pipe can keep a wall or floor damp behind the tiles. Mould that won’t shift, or staining on the ceiling below, needs checking for leaks.

Further reading +

What you can
do today.

Simple habits that help

  1. Run the extractor fan during your shower and for 15 to 20 minutes afterwards.
  2. Keep the door shut while showering, so steam goes out through the fan rather than into the house.
  3. Wipe down tiles, glass and windowsills after showering.
  4. Open the window afterwards if you can, and keep any trickle vents open.
  5. Keep the heating low and steady in cold weather rather than letting the room go cold.
  6. Clean the fan grille regularly so dust doesn’t restrict the airflow.

Signs it needs a closer look

  • Mould returns within a few weeks of cleaning
  • It’s spreading beyond the bathroom, onto landings or into bedrooms
  • Black mould deep in silicone sealant that won’t clean off
  • Plaster or ceiling board that feels soft, bubbles or comes away
  • A damp patch on the ceiling below, or on the wall outside the bathroom
  • The fan can’t hold a sheet of toilet paper against its grille

How we
sort it.

Find what’s feeding it

We look at the extraction, ducting, cold surfaces, sealant and possible leaks, and at when the mould appears. That tells us whether it’s a ventilation, temperature or water problem.

Treat the mould properly

Affected surfaces are treated, and plaster, board or sealant that’s too far gone is replaced rather than painted over.

Stop it returning

That might mean improving the extraction, a PIV system for whole-home condensation, or fixing a cold spot or leak. We explain what will make the difference before quoting.

Mould help
across north & west Cumbria.

Send your postcode to confirm availability, including nearby towns and villages.

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Carlisle & the north

Carlisle, Brampton, Longtown, Wigton

West Cumbria & the coast

Whitehaven, Workington, Maryport, Silloth, Aspatria, Egremont, Cleator Moor

Penrith & the northern Lakes

Penrith, Keswick, Cockermouth

Bathroom mould
FAQs.

Is black mould in the bathroom harmful?

UK government guidance says damp and mould can affect anyone’s health, particularly children, older people and anyone with a breathing condition or a weakened immune system. Small spots should be cleaned and the cause dealt with; mould that keeps returning or covers a large area needs a proper look.

What’s the best way to clean bathroom mould?

For small areas on hard surfaces, use a mould remover following the product instructions, wear gloves and keep the room ventilated. Avoid brushing dry mould, which spreads spores. Mould deep in silicone usually means the sealant needs replacing.

Will anti-mould paint fix it?

It can slow mould on the surface, but it won’t stop condensation or a leak. Without dealing with the moisture, mould usually returns, sometimes underneath the new paint.

How long should a bathroom fan run?

During your shower and for around 15 to 20 minutes afterwards is a good rule. Many fans have an overrun timer that keeps them running after the light is switched off.

My bathroom has no window. Is that a problem?

Not if the extraction is right. An internal bathroom relies entirely on its fan, so it needs to be powerful enough, ducted to the outside and kept clean.

Do you replace mouldy ceilings and walls?

Yes. Where plaster or board has been damaged, we can replace and replaster it as part of the job, once the cause of the moisture has been dealt with.

HOW WE CAN HELP

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