What is cement backer board?

Cement backer board, also called fiber-cement board, is a rigid tile substrate made from portland cement and fiberglass reinforcement. It resists water and moisture, making it the standard choice for wet areas in bathroom remodels across Connecticut.

Unlike standard drywall, which deteriorates when exposed to water, or greenboard, which offers only limited moisture resistance, cement backer board maintains its structural integrity behind tile in showers, tub surrounds, and wet walls. The material does not absorb moisture, expand, or sag under damp conditions. It also resists mold and mildew growth, which matters in spaces with constant humidity.

Backer board is typically installed over framing before tile is set with thinset mortar. Common thicknesses run 1/2 inch or 5/8 inch, and sheets are fastened with corrosion-resistant screws spaced every 8 inches or closer. The rigid surface provides a stable base for grout lines and tile, preventing cracks caused by flexing or water damage.

Bathroom remodelers use cement backer board anywhere tile meets prolonged moisture. This includes shower walls and floors, around tubs, and behind bathroom fixtures. Skipping it and using drywall leads to rot, mold, and costly repairs down the line. Proper installation with cement backer board ensures tile installations remain sound and waterproof for years. When planning bathroom work, confirm your contractor specifies backer board for all wet zones. Tile specialists know the right applications and installation methods.