5 Surprising Materials Mould Loves to Grow On (and How to Protect Your Home)

When people think of mould, they often imagine it on walls, ceilings, or bathroom tiles. But mould is opportunistic — it thrives in places you might not even suspect. If left unchecked, mould growth can damage building materials, ruin furnishings, and pose health risks.

Here are five common materials where mould loves to grow, and why they’re at risk:

1. Carpet Gripper / Smooth Edge

These strips of timber sit hidden beneath your carpet, especially near wet areas like bathrooms or sliding doors. If water seeps in, the timber and nails quickly become a breeding ground for mould — often spreading unseen beneath the carpet.

2. Engineered Wood (MDF & Chipboard)

Cupboards, benchtops, and drawers made from MDF or chipboard absorb moisture easily. Once damp, these materials swell, break down, and harbour mould deep inside — making them difficult to restore.

3. Grout in Wet Areas

Grout is porous and absorbs water, especially in bathrooms, kitchens, and laundries. Without proper ventilation and cleaning, mould can take hold in grout lines, leading to discolouration and persistent growth.

4. Gyprock (Plasterboard)

Gyprock is highly porous and acts like a sponge when exposed to water. Once mould grows inside the material, it often requires replacement rather than cleaning — especially after significant water damage.

5. Dust Build-Up

Dust may seem harmless, but it’s actually a food source for mould. When dust accumulates in hidden corners, under furniture, or inside air vents, mould can grow rapidly if moisture is present.

The Bottom Line

Mould doesn’t just grow where you can see it — it often thrives in hidden places and on everyday materials around your home. Regular inspections, good ventilation, and professional mould remediation are essential to keep your property safe and healthy.