How to Remove Mould from Exterior Walls (and Stop It Coming Back)

 🌧️Why Mould Is So Common in the Northern Rivers

If you live around Byron Bay, Ballina, Lennox Head or Lismore, you’ve probably seen mould growing on exterior walls.

Our climate makes it almost unavoidable:

• High humidity
• Frequent rain
• Shaded areas around homes
• Salt air near the coast

👉 Over time, this creates the perfect conditions for mould to grow on brick, render, and painted surfaces.

Early Signs of Mould (Before It Gets Bad)

Mould Treatment & Cleaning Process

1. Treating the mould

We start by applying a specialised mould treatment solution to the affected areas.

This step is crucial because it:

• kills mould spores at the root
• breaks down growth embedded in the surface
• prevents it from spreading further

👉 Simply pressure washing without treatment often leads to mould returning quickly.

2. Thorough cleaning

Once the treatment has had time to work, the surface is cleaned using pressure washing or soft washing, depending on the material.

This removes:

• dead mould
• dirt and contaminants
• any loose or failing paint

3. Proper drying time

Before any painting, the surface must be allowed to dry fully.

Painting over moisture can:

• trap damp inside the wall
• cause paint to fail prematurely
• lead to mould returning sooner

4. Preparing for a lasting finish

After cleaning and drying, the surface is ready for proper preparation and repainting if needed.

This may include:

• sanding and smoothing
• filling cracks or gaps
• applying high-quality exterior coatings