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

Wed, 22 Apr 2026 22:43:04 GMT

��️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)

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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

�� Repainting for a Long-Lasting Result

Once the mould has been properly treated and the surface thoroughly cleaned, repainting is what seals and protects the exterior for the long term.

A good paint job isn’t just about how it looks on day one — it’s about how well it holds up over time.

Finished Results After Proper Treatment

After proper mould treatment, thorough cleaning, and a well-applied paint system, the transformation is clear.

What was once stained, patchy, and affected by mould becomes:

clean and uniform
smooth to the eye
refreshed and well-presented

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