Fiber Cement Board Sizes & Specifications: The Complete Guide

Fiber cement boards are versatile building materials available in various sizes, densities, and thicknesses to suit different construction needs. Below is a detailed breakdown of fiber cement board specifications, including standard dimensions, density classifications, pressure types, fiber compositions, and recommended applications.

1. Standard Sizes of Fiber Cement Boards

Fiber cement boards typically come in the following dimensions:

• Standard Size: 2440mm (length) × 1220mm (width)
• Custom Sizes Available: Some manufacturers offer 3000mm × 1250mm or other tailored dimensions.
• Thickness Range: 4mm to 30mm (with options for ultra-thin and ultra-thick boards)

Common Thickness Categories:

✅ Ultra-Thin Boards (2.5mm – 3.5mm) – Used for lightweight applications like furniture backing.
✅ Standard Boards (4mm – 12mm) – Ideal for interior walls, ceilings, and decorative panels.
✅ Thick Boards (13mm – 30mm) – Suitable for exterior cladding and structural uses.
✅ Extra-Thick Boards (31mm – 100mm) – Designed for heavy-duty industrial and fire-resistant construction.

2. Density Classifications & Specifications

Fiber cement boards are categorized by density, affecting strength and application:

🔹 Low-Density Boards (0.9 – 1.2 g/cm³)

• Best for: Ceilings, non-load-bearing partitions.

🔹 Medium-Density Boards (1.2 – 1.5 g/cm³)

• Best for: Interior walls, commercial partitions.

🔹 High-Density Boards (1.5 – 2.0 g/cm³)

• Best for: Exterior facades, steel-structure buildings, flooring.

3. Pressure Types & Manufacturing Differences

• Non-Pressed Boards – Medium to low density, cost-effective for general use.
• Pressed Boards – High-density (1.5 – 1.75 g/cm³), stronger, and more durable for demanding applications.

4. Fiber Composition Types

⚠ Asbestos Fiber Cement Boards (Historical use, now restricted due to health risks)
✅ Non-Asbestos Fiber Cement Boards (Eco-friendly, made with cellulose, wood pulp, or glass fibers)

5. Recommended Thickness by Application

📌 4mm – 6mm (Thin Boards)

• Interior ceiling panels
• Decorative wall coverings
• Furniture surfacing

📌 8mm – 10mm (Medium Boards)

• Bathroom waterproof backing
• Office partition walls
• Retail space interiors

📌 12mm – 15mm (Thick Boards)

• Exterior cladding (rainscreen systems)
• Signboard substrates
• Curtain wall backing

📌 18mm+ (Extra-Thick Boards)

• Fire-rated walls (server rooms, staircases)
• Industrial building enclosures
• LOFT/mezzanine flooring