In California, fiber cement boards (often called Cemboard) are a highly-approved building material for residential construction due to their exceptional performance against the state's most challenging environmental risks, such as wildfires, earthquakes, and heat. Its low-maintenance durability and weather resistance also make it a reliable choice for the state's diverse climate. 

Performance against California's environmental risks

• Superior fire resistance: Fiber cement is a non-combustible material composed of cement, sand, and cellulose fibers, making it resistant to flames. It carries a Class A fire rating, the highest possible, and does not feed a fire, which is a major advantage in California's wildfire-prone areas. For this reason, many insurance companies offer a discount to homeowners who use it.

• Moisture and rot resistance: The dense composition of fiber cement prevents water absorption, protecting the home from moisture damage that can lead to rot, mold, and mildew. This makes it more durable than wood or stucco, especially in California's coastal and humid climates.

• Pest and insect resistance: Unlike wood siding, fiber cement is inedible to pests such as termites and carpenter ants. This helps prevent expensive damage and maintains the integrity of the home's structure.

• Heat and UV resistance: California's intense sun and high temperatures can cause some siding materials, like vinyl, to fade, warp, or crack over time. Fiber cement boards withstand harsh UV rays without losing their color or structural integrity for many years.

• Withstands wind and storms: Due to its weight and density, fiber cement siding is highly durable and can withstand high winds and severe weather conditions. Some manufacturers even offer products specifically engineered to protect against storms in coastal regions. 

Long-term value and code compliance

• Low-maintenance: Fiber cement siding requires minimal upkeep compared to wood, which needs frequent painting, or stucco, which needs regular repairs. The baked-on finishes offered by some brands resist chipping, cracking, and fading, which means you only need to repaint every 10–15 years.

• Aesthetic versatility: Manufacturers offer a wide variety of styles, textures, and colors, allowing homeowners to achieve the look of wood, stucco, or brick without sacrificing performance. This flexibility makes it a popular choice for many California architectural styles.

• Long lifespan: With proper installation and maintenance, fiber cement siding can last 50 years or more. This exceptional longevity makes it a smart long-term investment that increases a home's resale value and curb appeal.

• Building code compliant: The use of fiber cement siding for exterior walls is specifically allowed by the California Building Code, provided it meets the material and installation standards. It is also code-compliant for use in fire-resistance-rated wall assemblies, further solidifying its suitability in California.