ARDEX K 15 Premium Self-Leveling Underlayment for Smoothing Interior Concrete Floors, Fast-Setting, 55 lbs (25 kg) Bag (12433)

Product Features:

• High-Performance Self-Leveling Underlayment: High-performance cement-based self-leveling underlayment for creating strong, flat, and durable interior flooring surfaces.
• Smooth Interior Concrete Floors: Ideal for smoothing and leveling interior concrete floors before installing finished flooring in residential and commercial spaces.
• Fast-Setting Installation: Pumpable, pourable, and fast-setting for quick installation, with excellent flow, long working time, and minimal project downtime.
• Versatile Application Depth: Can be applied from featheredge up to 1.5" neat or 5" with aggregate, supporting shallow corrections and deeper leveling applications.
• Rapid Flooring Installation: Walkable in 2-3 hours; install flooring in as little as 16 hours, depending on application thickness and jobsite conditions.
• Wide Floor Covering Compatibility: Compatible with a wide range of floor coverings: tile, vinyl, LVT, VCT, carpet, and engineered hardwood.
• Multi-Use Flooring Applications: Suitable for commercial, residential, and industrial flooring applications, including fast-track installations and renovations.
• No Mechanical Profiling Required: No mechanical profiling needed on clean concrete surfaces, helping simplify substrate preparation and improve project efficiency.
• Strong and Crack Resistant: Excellent compressive strength, adhesion, and crack resistance, with superior bonding and shrinkage control for long-lasting results.
• Ideal for Demanding Projects: For use in hospitals, schools, retail, warehouses, and renovation projects requiring dependable, professional-grade performance.
• Radiant Heating Compatible: Compatible with radiant heating and underfloor heating systems for smooth, level substrate preparation in heated flooring projects.
• Moisture-Resistant Interior Use: Interior use only – non-porous and moisture-resistant, making it suitable for concrete and certain non-porous surfaces.
• Convenient 55 lb Bags: Available in 55 lbs (25 kg) bags for practical handling, mixing, pouring, and application across projects of different sizes.

Product Description:

ARDEX K 15 Premium Self-Leveling Underlayment is a high-performance, Portland cement-based underlayment formulated for interior use over concrete and certain non-porous surfaces. As the original and most specified self-leveling underlayment in North America, this premium self-leveling compound delivers exceptional flow, extended working time, and outstanding performance for fast-track commercial, residential, and industrial flooring installations. Formulated with a special blend of polymers, it mixes only with water for easy preparation and can be poured manually, with the ARDEX ROVER®, or pumped using the ARDEX AMP® system for maximum installation efficiency.

Designed to level and smooth interior substrates prior to installing finished flooring, ARDEX K 15 provides a strong, flat, and durable surface that supports a wide variety of flooring options including ceramic tile, natural stone, LVT, VCT, resilient flooring, wood, carpet, and engineered hardwood. It is suitable for installation over interior concrete, terrazzo, ceramic and quarry tile, epoxy coating systems, wood, metal, non-water-soluble adhesive residue on concrete, and even concrete treated with certain curing compounds when properly primed. The fast-setting formulation allows foot traffic in just 2-3 hours, moisture-insensitive tile and stone installation in as little as 6 hours, and most other floor coverings in as little as 16 hours, depending on application thickness and jobsite conditions.

With its outstanding pumpability and extended pot life, ARDEX K 15 is perfect for large-scale renovations, industrial floors, hospitals, schools, retail stores, warehouses, commercial buildings, and institutional settings. It can be applied from featheredge up to 1.5 inches neat, up to 5 inches with aggregate, and can also be tapered to meet varying substrate conditions. Suitable for use on, above, or below grade, this moisture-resistant underlayment requires no mechanical profiling on clean, sound concrete and is compatible with radiant and in-floor heating systems. Engineered for superior bonding, shrinkage control, exceptional compressive strength, and crack resistance, ARDEX K 15 delivers a flat, level, and long-lasting surface under the most demanding flooring systems while maintaining a low VOC formulation.

Whether you're preparing a concrete slab for resilient flooring or smoothing a surface before installing tile, ARDEX K 15 provides the reliable, high-performance results professionals trust. It is easy to mix and pour, ensuring minimal downtime and maximum efficiency on every project. For best results, use ARDEX P 51™ Primer over concrete substrates and ARDEX P 82™ Ultra Prime over most non-porous substrates, epoxy coatings, and adhesive residue. Packaged in convenient 55 lb (25 kg) bags with coverage of approximately 30 sq. ft. at 1/4 inch thickness, ARDEX K 15 continues to set the benchmark for premium self-leveling underlayments, delivering dependable performance and professional-quality results on every installation.