Introduction
Fiber cement boards are known for their strength, durability, and resistance to moisture and fire. But one common concern from contractors and homeowners is:
“Do fiber cement boards crack over time?”
The short answer: Yes, they can — but only if installed incorrectly or under extreme stress.
Let’s break down the reasons behind potential cracking and how you can prevent it for a long-lasting result.
Why Do Fiber Cement Boards Crack?
Fiber cement is a rigid, non-flexible material. While it’s strong, it doesn’t bend or flex like some other cladding or panel options. Here are the most common causes of cracks:
- Improper Handling
Fiber cement boards can crack during transport or handling if dropped or bent.
- Poor Installation
- No gap for expansion
- Screws placed too close to the edge
- Incorrect framing support
These errors place stress on the board, which can result in hairline or visible cracks.
- Structural Movement
Buildings naturally expand and contract due to temperature changes, seismic activity, or settling. If boards are not installed with proper allowances, cracks may appear.
- Thermal Expansion
Although fiber cement is stable, it still reacts to extreme temperature changes. Without proper spacing or joints, this movement can lead to cracking.
How to Prevent Fiber Cement Boards from Cracking
Proper planning and installation can prevent most cracking issues. Here’s how:
Use the Right Tools
Always cut fiber cement boards with specialized tools and support them properly during cutting to avoid stress fractures.
Follow Manufacturer Guidelines
- Leave the recommended expansion gaps between panels
- Use corrosion-resistant screws
- Avoid overdriving screws into the board
- Follow the proper spacing from edges when fixing
Support the Panels Correctly
Ensure the substructure is flat, level, and aligned. Irregular or weak framing can put pressure on the board over time.
Use Control Joints
In larger installations, include control or movement joints to handle expansion and contraction.
Handle with Care
Avoid dragging panels or leaning them vertically on uneven surfaces. Always carry them flat and store them in dry, flat areas.
Long-Term Durability
Fiber cement boards can last for decades if:
- Installed properly
- Maintained occasionally
- Protected from structural or impact stress
Cracking is usually a result of human error during or after installation, not a flaw in the material itself.
Conclusion
So, do fiber cement boards crack over time?
They can — but only if misused, mishandled, or installed without following basic guidelines.
By using the right tools, allowing for movement, and securing panels correctly, you can ensure your fiber cement installation stays crack-free and solid for many years.
Looking for a crack-resistant, long-lasting board solution?
👉 Visit the Smartfiber Fiber Cement Board page to explore specs, sizes, and delivery options.
Authored by Smartcon Int’l. Trade & Marketing Ltd. on 15.07.2025. All rights reserved.