Backer Board & Accessories

Backer board provides a compatible substrate between the supporting structure and finished tile assembly. Depending on the product, it can be used on walls, floors, showers, tub surrounds, backsplashes, countertops, and other tiled surfaces. Approved applications and installation requirements vary by backer board type and manufacturer.

Cement board uses a cementitious construction, while foam backer board uses a lightweight foam core with surfaces designed for compatible tile installation. Their weight, moisture performance, rigidity, thicknesses, fastening methods, and waterproofing requirements differ, so the appropriate board depends on the specific tile assembly and application.

It depends on the product. Some backer boards are designed to form part of a waterproof assembly when seams, fasteners, penetrations, and transitions are properly treated. Other boards are suitable for wet areas but require a separate waterproofing system. Check the manufacturer's specifications rather than assuming all backer boards are waterproof.

Several types of tile backer board can be suitable for showers and wet areas, including compatible foam panels, cementitious boards, and other building panels. The correct product depends on the shower system and waterproofing method. Verify whether the selected board provides waterproofing itself or requires a separate membrane.

Backer board should be installed with fasteners approved for the specific panel and supporting structure. Depending on the system, this can include corrosion-resistant backer board screws, specialized screws, and washers. Required fastener length, spacing, penetration, and compatibility with wood or metal framing vary by manufacturer.

Most backer board systems require specified treatment at panel joints, although the materials and methods vary. Depending on the board, seams can require reinforcing fabric, mesh tape, mortar, waterproofing bands, sealant, or another system-specific product. Wet-area installations can require additional waterproofing treatment at seams and transitions.

Required backer board thickness depends on the product, application, supporting structure, framing or subfloor spacing, and tile assembly. Different thicknesses can be approved for walls, floors, countertops, or other applications. Follow the panel manufacturer's specifications rather than selecting thickness solely according to whether the installation is a wall or floor.

Start with the installation area, supporting structure, and moisture exposure. Compare panel material and thickness, approved applications, waterproofing requirements, and tile assembly. Then select compatible screws, washers, seam materials, and other accessories specified for that panel system rather than assuming components from different backer board systems are interchangeable.