What is Mould and it's effect on your Health?

Introduction

Toxic mould is a growing issue across Australian homes, particularly in humid and flood-prone regions. In cities like Brisbane and coastal areas of New South Wales, moisture, poor ventilation, and storm events create ideal conditions for mould growth.

While often dismissed as a cosmetic issue, mould can pose serious health risks and structural damage if left untreated. This guide explains how to identify mould, understand the risks, and safely remove and prevent it.

What is Mould?

Mould is a type of fungus that grows in damp, humid environments. It reproduces by releasing microscopic spores into the air, which can settle and grow on surfaces when moisture is present.

Common indoor mould types include:
• Black mould
• Green and white surface mould
• Mildew (a form of early-stage mould).

Mould can grow on:
• Walls and ceilings
• Carpets and soft furnishings
• Timber and plasterboard
• Air conditioning systems.

Why is Mould Dangerous?

Mould exposure can impact health, particularly for children, the elderly, and those with respiratory conditions.

Common health effects include:
• Allergic reactions (sneezing, skin irritation)
• Respiratory issues (wheezing, coughing)
• Headaches and fatigue.

More severe exposure has been linked to conditions such as:
• Asthma
• Hypersensitivity Pneumonitis.

Long-term exposure in heavily contaminated environments can significantly affect indoor air quality.

What Causes Mould in Homes?

Mould growth always comes back to moisture.

The most common causes in Australia include:
• Water leaks (roofing, plumbing, windows)
• Flooding and storm damage
• Poor ventilation in bathrooms and kitchens
• Condensation buildup
• High humidity levels.

After major weather events, mould outbreaks often follow within 24–72 hours.

Where Mould is Commonly Found?

Mould is often hidden, not just visible.

Check high-risk areas:
• Behind furniture and wardrobes
• Inside cupboards and storage areas
• Ceiling cavities and roof spaces
• Under carpets
• Around windows and seals
• Inside air conditioning systems.

If you can smell mould but not see it, it is likely growing out of sight.

Signs You May Have a Mould Problem

• Musty or damp odour

• Visible spotting or staining on walls or ceilings
• Peeling paint or bubbling plaster
• Increased allergy symptoms indoors
• Previous water damage or flooding.

Is Mould Worse After Flooding?

Yes—significantly.

After flooding or water damage:
• moisture penetrates deep into materials
• drying is often incomplete
• mould can spread rapidly behind walls and flooring.

This is especially common in regions affected by seasonal storms across Queensland.