How to Stop Mould and Damp from Plumbing Problems

Mould and damp are some of the most frustrating problems for homeowners. Not only do they make your bathroom or kitchen look and smell unpleasant, but they can also trigger allergies, asthma, and other health problems. In many cases, the culprit isn’t just poor ventilation — it’s an underlying plumbing problem.

• Health risks – Mould spores can trigger allergies, asthma, and respiratory irritation, especially in children, the elderly, or anyone with a weakened immune system. Prolonged exposure can make day-to-day living uncomfortable and even unsafe.
• Structural damage – When moisture seeps into walls, ceilings, and floors, it can weaken plaster, rot timber, and damage paintwork or tiles. Over time, this may lead to expensive repairs or renovations.
• Unpleasant smells and stains – Mould has a distinct musty odour that lingers and can spread beyond the affected area. Stains and black spots on grout, tiles, or plasterboard are also difficult to remove without fixing the underlying moisture problem.
• Higher costs later on – Ignoring damp issues now almost always means paying more down the track. What starts as a small leak or patch of mould can grow into a large-scale plumbing or building repair if the issue is ignored.

Plumbing Issues That Cause Mould and Damp

While Adelaide’s humid climate can sometimes make bathrooms and laundries prone to mould, plumbing problems are often the hidden cause behind persistent dampness. Here are the most common culprits:

• Leaking taps and showerheads – Even small drips can create constant moisture, leaving surfaces damp and encouraging mould growth.
• Hidden pipe leaks – Pipes that run behind walls or under floors can leak slowly without being noticed. Over time, this trapped moisture becomes the perfect breeding ground for mould.
• Poorly sealed fixtures – Gaps around bathtubs, sinks, or toilets allow water to escape during everyday use, seeping into surrounding walls and flooring.
• Blocked drains – When drains don’t flow properly, water can pool and stagnate, leading to damp, foul smells, and eventual mould patches.
• Improper ventilation – Poor airflow means bathrooms, kitchens, and laundries stay damp for longer. When combined with even the smallest leak, this creates the ideal environment for mould to thrive. 

Once the source of the moisture is addressed, mould has little chance to return.

How to Stop Mould and Damp at the Source

Fixing mould and damp isn’t just about cleaning the visible patches — it’s about addressing the cause of the moisture so it doesn’t return. Here are some effective ways to tackle the problem at its source:

• Find and fix leaks quickly – Even a slow drip adds up over time. Repairing leaking showerheads, taps, or hidden pipes prevents constant dampness and reduces the risk of mould regrowth.
• Improve ventilation – Use exhaust fans, open windows, or install ventilation systems to keep air moving and reduce humidity, especially in bathrooms and laundries.
• Seal and waterproof properly – Make sure tiles, grout, and fixtures are sealed correctly. Cracked grout or worn sealant allows water to seep into walls and flooring, feeding damp problems.
• Check water pressure – Excessive water pressure can strain fittings and seals, making leaks more likely. A plumber can install a pressure regulator to protect your system.
• Schedule regular plumbing maintenance – Having a licensed plumber inspect your home can uncover small leaks, loose fittings, or worn parts before they turn into bigger, mould-causing issues.

When mould and damp are caused by plumbing problems, a professional repair is the only way to make sure the issue doesn’t return. At Best Plumbing, we’ve been helping Adelaide homeowners protect their homes from water damage for more than 30 years.

Our licensed plumbers use advanced leak detection equipment to locate hidden leaks behind walls and floors without unnecessary damage to your property. Once we identify the source, we provide reliable repairs for taps, showerheads, toilets, drains, and hot water systems.

We also offer advice on waterproofing and sealing fixtures, ensuring your bathroom, kitchen, and laundry are protected against future leaks. Combined with proper ventilation, our plumbing solutions give you long-term protection against mould and damp.

With same-day emergency service across all Adelaide suburbs, you can count on Best Plumbing to stop mould at its source, repair the damage, and restore peace of mind in your home.

To prevent mould from returning, keep your home dry and well-ventilated, reseal any damaged grout or tiles, and clean damp areas regularly. Watch for sudden rises in water bills as they can signal hidden leaks, and schedule annual plumbing inspections to catch problems early. With a mix of good habits and regular maintenance, you can keep mould and damp at bay for the long term.

Get Rid of Mould and Damp for Good

If mould and damp keep coming back in your home, chances are the real problem lies in your plumbing. DIY cleaning may remove stains temporarily, but only fixing the source of the moisture will stop it for good.

We service all Adelaide suburbs and offer prompt, same-day repairs for urgent problems. Whether it’s a leaking tap, a hidden pipe leak, or poor waterproofing around fixtures, we’ll get your plumbing back in shape and help keep your home dry and mould-free.

Call Best Plumbing today on (08) 8261 0165 or book online to put an end to mould and damp caused by plumbing problems.