black mould on white roof

Black Mould and Bathrooms: What You Need to Know

It’s not uncommon to discover black mould creeping into the bathroom. This living, feeding fungus works its way into moist environments before spreading along walls, ceilings and even furniture. In most cases, the unsightly substance is harmless, doing little more than messing with the aesthetics of a home. However, there’s potential for black mould to encroach on your respiratory system, raising health concerns.

So why does black mould form in the bathroom, and more importantly, what can you do to eliminate it? Here’s what you need to know:

Why is Black Mould in My Bathroom?

Black mould is not the result of poor housekeeping. It’s actually a sign of a bigger problem that likely stems from poor ventilation.

Mould can grow in any environment with sufficient condensation or humidity. So there are few places more suitable than the bathroom after a steamy shower.

Failing to open a window or switching on an exhaust fan are the primary culprits of moisture and condensation. But even things like a leaking roof, tap or toilet can also spur mould into action.

The issue can also stem from poor wall and ceiling insulation and a clash of extreme differences between indoor and outdoor temperatures. So, points where hot and cold air meets – like a window or doorway – can also cause condensation.

how to remove black mould

Is Black Mould Harmful to My Health?

According to Healthline, black mould exposure can cause coughing, red and itchy eyes, a blocked nose, skin rash and a sore throat. It can also cause asthma attacks and breathing difficulties for those with chronic respiratory disease.

There are commonly held beliefs that black mould carries serious health risks. Things like headaches, memory loss, cancer and even death have been attributed to black mould. However, a 2017 study titled Mold and Human Health: a Reality Check asserts no evidence supports these claims.

It’s likely that these beliefs are attributed to toxic moulds which are associated with foods, grain and fibres. Still, the proven symptoms of black mould exposure are reason enough to remove it from the home once and for all.

How to Remove Black Mould

It’s important to remove mould as soon as it appears and before it can raise health concerns. However, removing the existing mould won’t stop it from returning, so you will also need to implement a long term solution.

Dr Heike Neumeister-Kemp is a mycologist fondly known as the Mould Lady. Speaking to the ABC, she said the best way to remove black mould is with a vacuum and vinegar.

“Vacuum all the loose spores off,” she said. “Then take a microfibre cloth and use a vinegar solution, and gently wipe off the mould.”

Your solution should be made from 80 per cent white wine vinegar and 20 per cent water.

While many mould removal guides say that bleach is the best way to remove mould, this is a misconception.

“The bleach just takes the colour out, but the fungi are still there, you are just masking it,” said Dr Neumeister-Kemp. “Six weeks later, it appears to come back, but it was never gone.”

bathroom exhaust fan

Next up, you should be focusing on how to keep the mould from returning. The most effective way to do this in a bathroom is with an exhaust fan, also referred to as an extractor fan.

The exhaust fan is available as a standalone unit or built into a bathroom heat light. You will need to book an electrician to have either one installed, but the initial costs will be quickly outweighed by the many benefits that stem from a mould-free home.

Opening a window fails in comparison, as this can interrupt the climate control of your home and again, extreme temperature differences can clash, resulting in condensation – the thing you’re trying to avoid.

A dehumidifier is a suitable alternative for removing moisture from a room, although a quality unit can be expensive and should only be used as a quick fix. If a dehumidifier is a bandaid, then an exhaust fan is the cure.

If you’re concerned about mould lingering behind the walls or in the ceiling, an air quality expert can conduct appropriate tests. But if the black mould appears exclusively around the shower or a window in the bathroom, then there’s a good chance that an exhaust fan will be adequate for keeping the mould out.

Published: 2021-03-16

Labour Day with Electrical Contractors

No Extra Charge After Hours

Metropolitan is available 24/7 for all your electrical requirements. Offering round-the-clock service, no additional weekend or public holiday charges, and flexible finance options**, your peace of mind is assured.

Book Now

Electricians You Can Trust

Our Promise to You

Our electricians pride themselves with honest reliable services


We believe in transparency. We will guide you through our process, answer your questions and provide you with upfront, no obligation fixed prices.

Committed to provide excellent and efficient electrical services


No matter how big or small the job is, whether you're a new or returning customer, we treat every job as important and strive for success.

Professional Expert Electrical Technicians


We know our job site is your home and we completely respect that. We arrive neat and clean, and tidy up after we've completed the job.

Electrician Zip Pay Payment Options Image
Electrician Zip Pay Payment Options Image

Now Available!

Electrical finance options** with trusted pay later options

What Our Happy Customers Have to Say

Better service starts here

5 stars rating img

Simon was very professional and did excellent work. Provided clear explanations and very informative options for the job. An excellent result was achieved. Thanks again Simon for your help!

Paul - SA
5 stars rating img

Ferris was on time and very professional. He understood straight away what was going on. He fixed the issue with my lights and even did a full electrical inspection. Very happy.

Andrew - VIC
5 stars rating img

Angelo changed some circuits on my board that were damaged and causing the power to go off. He fixed it quickly and explained the damage. Absolute champion.

Kaye - SA
  • HMP Hot Water Logo

    HPM are leaders in the Australian electrical industry and Metropolitan is available 24/7 to install and repair their products.

  • Wilson Hot Water Logo

    Metropolitan Electrical Contractors has experts at installing, repairing and servicing all Wilson electric hot water systems.

  • Thermann Hot Water Logo

    When you need an expert in Thermann electric hot water products, contact your local specialists.

  • Vulcan Hot Water Logo

    When you need an expert in Vulcan's electric hot water systems, contact your local specialists.

  • Stiebel Eltron Hot Water Logo

    We work with Stiebel Eltron electric hot water systems. When you need service you can trust, call Metropolitan Electrical Contractors.

  • Rinnai Hot Water Logo

    When you need an expert in Rinnai's electric hot water systems, contact your local specialists.

  • Schneider Electric Hot Water Logo

    Metropolitan Electrical Contractors is your local Schneider Electric specialist.

  • Rheem Hot Water Logo

    Did you know Metropolitan Electrical Contractors can install, service and repair all Rheem electric hot water systems?

  • Philips Hot Water Logo

    For fast and efficient Philips electrical services, Metropolitan Electrical Contractors is your number one local expert.

  • Pierlite Hot Water Logo

    Metropolitan Electrical Contractors is proud to use high quality brands such as Pierlite.

  • OMEGA Hot Water Logo

    If you're after quality OMEGA electrical products for your home or business, call the experts at Metropolitan Electrical Contractors.

  • OSRAM Hot Water Logo

    OSRAM electrical products are highly recommended by the expert team at Metropolitan Electrical Contractors.

  • NHP Hot Water Logo

    Need an electrical expert who works with the NHP brand? Look no further than your local Metropolitan Electrical Contractors electricians.

  • Hager Hot Water Logo

    When you need an expert in Hager electrical products you need Metropolitan Electrical Contractors.

  • Legrand Hot Water Logo

    Metropolitan Electrical Contractors is proud to work with high quality brands such as Legrand.

  • Crompton Lighting Hot Water Logo

    We are proud to work with high quality products such as Crompton Lighting. Metropolitan Electrical Contractors is a name you can trust.

  • Dux Hot Water Logo

    When you need a Dux electric hot water installation, service or repair, call the team at Metropolitan Electrical Contractors.

  • Clipsal Hot Water Logo

    Metropolitan Electrical Contractors is proud to work with high quality brands such as Clipsal.

  • Bosch Hot Water Logo

    Metropolitan Electrical Contractors are experts at installing, repairing and servicing Bosch electric hot water systems.

  • Chromagen Hot Water Logo

    Did you know that Metropolitan Electrical Contractors supply, install and repair Chromagen electric hot water systems?

  • AquaMAX Hot Water Logo

    Metropolitan Electrical Contractors choose Australian owned and operated AquaMAX for a range of electric hot water services.

metropolitan electrical contractors Service Reviews metropolitan electrical contractors service reviews