Ardex Liquid BackerBoard, Portland Cement-based Self-Levelling Underlayment for Encapsulating In-floor Electrical Heating Systems, Interior Wood and Concrete Subfloors, 50 lb (22.7 kg) Bag

Product Features:

• Ardex self-leveling underlayment features an easy-to-use, pourable formula with a long working time, allowing installers to smooth and level subfloors prior to the installation of tile, stone, hardwood flooring, engineered wood, laminate, vinyl plank, and luxury vinyl tile (LVT). This high-performance underlayment creates a flat, even surface ideal for bathroom tile, kitchen tile, basement floors, and whole-home flooring preparation.
• Imperfections and surface irregularities can be corrected within 15 minutes after pouring, and an additional 15-minute “healing time” is achieved by lightly troweling the surface. This ensures a smooth, durable finish that reduces lippage under large-format tile and natural stone.
• Ardex Liquid BackerBoard applies up to 1/2" thick in a single pour and is an excellent prefill option over uncoupling membranes, including popular systems used for tile underlayment and electric heated floor installations. Its flowable consistency eliminates gaps, dips, and uneven spots.
• This self-leveling underlayment does not require lath mesh or additives, even over wood subfloors. It is ideal for encapsulating electrical in-floor heating systems such as radiant heat cables and mats, providing a protective, uniform layer that improves heat distribution and tile adhesion.
• It is suitable for a wide variety of substrates including concrete, cement backerboard, exterior-grade plywood with joists up to 24" o.c., ceramic tile, pavers, brick, natural stone, concrete terrazzo, sheet vinyl, cutback adhesive (non-water-soluble), and properly prepared existing flooring materials. This makes Ardex Liquid BackerBoard extremely versatile for residential, commercial, and light industrial flooring projects.

Product Description:

Ardex Liquid BackerBoard self-leveling underlayment is engineered for interior wood and concrete subfloors, offering a faster, easier alternative to traditional tile backerboards. Formulated from Portland cement and advanced hydraulic cements, this pourable underlayment replaces cutting, fitting, gluing, and fastening board materials, allowing installers to create a seamless, monolithic surface ideal for tile, stone, wood, and resilient flooring installations. It is specifically designed to flatten and level uneven subfloors in preparation for ceramic tile, porcelain tile, mosaic tile, marble tile, granite tile, shower tile, stone tile, and large-format tile installations.

Ardex Liquid BackerBoard does not require lath mesh, even over wood substrates, significantly reducing labor time while delivering industry-leading strength, crack resistance, and bond performance. Tile and stone can be installed in as little as 6 hours, making it a high-efficiency option for contractors, renovators, and DIY professionals. The product is also suitable for engineered wood plank flooring, laminate flooring, luxury vinyl plank, and floating floor coverings. Additionally, it is designed for encapsulating in-floor electrical heating systems, providing a smooth, protective surface that enhances radiant heat performance.

This self-leveling underlayment can be used for home décor upgrades, bathroom remodels, kitchen flooring, living room renovations, basements, and commercial or industrial applications where a flat, durable substrate is essential. Its user-friendly design makes installation straightforward and predictable, ensuring professional-grade results that improve aesthetics, tile alignment, and long-term flooring durability.

One bag provides exceptional coverage, replacing three sheets of traditional backer board, making it a cost-effective and efficient solution for large and small projects. Ardex Liquid BackerBoard mixes easily with just water and requires no additives. It can be installed up to 1 1/4" (3.1 cm) thick and becomes walkable in 2–3 hours. With excellent coverage of approximately 65 sq ft at 1/8", it is the ultimate flat surface for tile, stone, and large-format flooring installations.