Cement board and fibre cement board are often confused, but they’re not the same. While both are strong, moisture-resistant and widely used in construction, the difference lies in their composition and typical applications.

• Cement board is made from cement and reinforcing fibres.
• Fibre cement board contains cement too, but also sand, silica and cellulose fibres — making it stronger and more versatile, especially outdoors.

Choosing the right board affects durability, maintenance needs, cost and long-term performance, so understanding the difference is essential.

Cement Board Overview

Composition

Cement board is typically made from:

• Cement (the main structural binder)
• Cellulose or mineral fibres for reinforcement
• Fire-resistant fillers

Modern cement boards contain no asbestos or formaldehyde, and some brands include recycled content for sustainability.

Where Cement Board Is Used

Cement board is designed for interior or protected environments, especially anywhere exposed to moisture. Common uses include:

• Bathroom and shower tile backer boards
• Wet room walls and floors
• Kitchen splashback areas
• Substrates for stone or tile
• Ceiling boards in humid areas
• Partition walls
• Roofing underlay
• HVAC duct lining
• Utility cupboards

Key Features

• Excellent moisture resistance
• Non-combustible
• Strong and stable
• Doesn’t rot, rust or support mould
• Low maintenance

Cement board is usually hidden behind tile or another finish because it has a plain, grey appearance.

Fibre Cement Board Overview

Composition

Fibre cement board is a more engineered product, typically including:

• Cement
• Silica or other mineral fillers
• Cellulose fibres
• Water
• Additives for stability, durability and workability

The added fibres give fibre cement board better flexural strength, making it more suitable for exterior use.

Where Fibre Cement Board Is Used

Fibre cement is a versatile external façade material used for:

• Exterior cladding and siding
• Exterior soffits and fascias
• Fire-rated partitions
• Weatherproof façades
• Tile backer boards
• Roof underlay
• Garden buildings and outbuildings

Key Features

• Highly durable outdoors
• Non-combustible and fire-safe
• Resists rot, pests and moisture
• Weatherproof
• Available in textures that mimic timber, render, stone or smooth finishes
• Low maintenance

Because it offers aesthetic finishes, fibre cement is often used as the final visible surface.

Cement Board vs Fibre Cement Board: What’s the Difference?

1. Composition

• Cement Board: Cement + fibres
• Fibre Cement Board: Cement + fibres + sand/silica + cellulose

This difference gives fibre cement board:

• More strength
• Better flexibility
• Better weather resistance

2. Durability

Both are durable but in different ways:

• Cement board: Excellent indoors and in wet areas, but not designed for long-term exterior exposure.
• Fibre cement board: Engineered for outdoor use, resisting UV, rain, frost and impact.

3. Appearance

• Cement board: Plain, grey, usually covered with tile or render
• Fibre cement board: Available in woodgrain, smooth, stone-effect, or painted finishes — often used as cladding

4. Maintenance

• Cement board: Very low maintenance when installed behind finishes
• Fibre cement: Low maintenance but may require repainting every 10–15 years (unless factory-coated)

5. Cost

Cement board is generally cheaper upfront.
Fibre cement board costs more, but:

• lasts longer
• looks better
• adds value
• requires less long-term upkeep

Cement Board: Pros & Cons

✔ Pros

• Excellent in wet areas
• Great tile backing strength
• Fire-safe and non-combustible
• Stable and durable
• Affordable compared to fibre cement

✗ Cons

• Heavy to handle
• Harder to cut
• No decorative finish
• Not ideal for long-term exterior exposure
• Low thermal insulation value

Fibre Cement Board: Pros & Cons

✔ Pros

• Extremely durable outdoors
• Weather, rot and pest resistant
• Non-combustible
• Attractive finishes (wood, smooth, textured)
• Low long-term maintenance
• Long lifespan

✗ Cons

• Heavier and harder to install
• Requires dust-controlled cutting tools
• More expensive than cement board
• Needs correct sealing and detailing to prevent moisture behind the façade

Which One Should You Choose?

Choose cement board if:
✔ You’re tiling a bathroom, shower room or wet room
✔ You need a strong, stable tile backer
✔ The board won’t be exposed to the weather
✔ You want a cost-effective interior solution

Choose fibre cement board if:
✔ You’re cladding a building exterior
✔ You want a long-life, low-maintenance façade
✔ You need a fire-safe, weatherproof material
✔ Appearance and design options matter
✔ You want a material that can mimic timber without the upkeep

FAQ

What is the main difference?
Cement board is used mainly as an interior tile backer; fibre cement board is a stronger, more weather-resistant product used for exterior cladding.

Can you use fibre cement board in bathrooms?
Yes — but it’s usually over-specified. Cement board is more cost-effective for indoor tile backing.

Can you paint fibre cement board?
Yes. It holds paint very well and retains colour longer than timber. Factory-finished boards often last the longest.

Does cement board rot?
No — it’s inorganic and moisture-resistant. But it must be kept indoors or protected from long-term weather exposure.

Which lasts longer?
Fibre cement board generally has a longer exterior lifespan, while cement board lasts indefinitely indoors when installed correctly.