Fiber cement board is waterproof or water-resistant?

 

Fiber cement board is water-resistant, not entirely waterproof. While the terms are often used interchangeably, there's a crucial difference.

• Water-resistant means the material can withstand exposure to water without degrading, rotting, or swelling. Fiber cement boards are made of cement, sand, and cellulose fibers, so they won't rot or grow mold when they get wet. They're excellent for high-humidity areas like bathrooms, kitchens, and exterior siding.
• Waterproof means the material creates a complete barrier that water cannot penetrate at all. Standard fiber cement boards are not a total vapor barrier; water can eventually pass through them. For applications like a shower enclosure or a building's foundation where water will be constantly present, you need to apply a separate waterproofing membrane or sealant to the surface of the board to make the system fully waterproof.

Some manufacturers offer specialized waterprooffiber cement boards that have a waterproofing core or are treated to meet specific waterproof standards. However, for a standard board, it's best to rely on its inherent water resistance and add a dedicated waterproofing layer for truly wet environments.

More information, please visit at www.hocre-board.com or send message by whatsapp +86 15001321220