Does fiber cement board fade or change color over time?

 Yes, fiber cement board can fade or change color over time, although it's generally more resistant to fading than other materials like wood or vinyl siding. The extent of the color change depends on several factors, primarily the type of finish applied to the board.

The Role of Finishes

Most fiber cement board comes in one of two finishes:

• Pre-finished with baked-on color: This is the most durable and fade-resistant option. The paint is then baked onto the board, creating a strong, UV-resistant bond. This process results in a finish that's engineered to last for decades without significant fading, chipping, or peeling.
• Primed, ready for field painting: This type of board comes with a primer coat, and the final color is applied on-site by a painter. While this gives you a wider range of color choices, the longevity of the color depends on the quality of the paint and the application process. Exterior-grade paint with UV protection is recommended, but it will still require repainting every 7 to 15 years to maintain its appearance.

Causes of Fading

Even with durable finishes, some degree of color change can occur due to:

• UV exposure: Sunlight's ultraviolet (UV) rays are the primary cause of fading. They break down the pigments in the paint, causing the color to become less vibrant over time. Darker colors tend to absorb more heat and light, which can accelerate this process compared to lighter shades.
• Weather and climate: Rain, snow, and extreme temperature fluctuations can wear down the protective finish on the siding. For example, constant rain can wash away a paint's protective coating, while the reflection of sunlight off snow can intensify UV exposure.
• Dirt and pollution: The accumulation of dirt, grime, mold, or mildew on the surface of the siding can also make the color appear dull or discolored. Regular cleaning can prevent this.

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