ARDEX SKM Skimcoat Patch and Finishing Underlayment – Non-Sanded Compound, 10 lbs Bag, Fast-Drying Floor Smoothing for Interior Concrete, Wood, Tile, Stone, 22254

Product Features:

• Featheredge Skim Coat to 1/2" Thickness – Creates a perfectly smooth surface for all floor coverings
• Fast-Drying & Quick-Set Formula – Install most floor finishes in as little as 15 minutes; walkable in 30 minutes
• Excellent Bond to Multiple Substrates – Adheres to concrete, plywood, VCT, terrazzo, ceramic tile, stone, and more
• Non-Sanded, Trowel-Applied Texture – Smooth creamy consistency for easy application and superior workability
• Polymer-Modified for Durability – Resists cracking, shrinking, and delaminating even in thin applications
• Ideal for Surface Repairs & Spot-Patching – Perfect for skim-coating large areas or patching minor imperfections
• Compatible with All Floor Types – Works under vinyl plank, carpet, engineered wood, tile, laminate, and sheet flooring
• Low VOC & LEED® Eligible – Contributes to healthier indoor air quality and green building certification
• Covers Up to 200 Sq. Ft. per Bag – Economical solution with excellent spread rate
• Approved for Radiant Heated Floors – Safe for use over electric and hydronic floor heating systems
• SystemOne™ Warranty Eligible – Peace of mind when used with ARDEX and Henry system components
• Suitable for Commercial, Institutional & Residential Use – Built to withstand high-traffic environments

Product Description:

ARDEX SKM Skimcoat Patch & Finishing Underlayment is a fast-drying, cement-based skim coat compound ideal for smoothing and patching interior concrete, wood, terrazzo, ceramic tile, and other substrates prior to the installation of floor coverings. Engineered for professional flooring installations, ARDEX SKM provides an ultra-smooth, featheredge finish that’s ready for floor covering in as little as 15 minutes.

Whether you're repairing minor surface defects, patching cracks, or leveling irregularities, this high-performance underlayment ensures superior bond strength and durability. It is compatible with a wide range of adhesives and flooring types, including vinyl, VCT, laminate, engineered wood, carpet, and tile. This polymer-modified, easy-to-apply blend is trowelable and shrinkage-resistant, delivering outstanding coverage and a reliable, crack-resistant surface.

ARDEX SKM is perfect for skim-coating large surface areas or spot-patching high-traffic commercial, institutional, and residential settings. It can be used over concrete, gypsum, cement backer board, existing resilient flooring, and more. ARDEX SKM meets or exceeds industry standards for floor preparation and is suitable for use with radiant heated floors and moisture-sensitive floor finishes when installed correctly.

ARDEX SKM™ Skimcoat Patch & Finishing Underlayment is a premium-grade, polymer-modified, cement-based compound designed for fast-track floor preparation in both residential and commercial interior environments. This high-performance skim coat is ideal for smoothing, patching, and feather-finishing over a wide variety of substrates including concrete, wood, terrazzo, ceramic tile, VCT, and non-water-soluble adhesive residues. It creates a smooth, durable, and sandable finish ready to receive most floor coverings in as little as 15 minutes, making it the go-to solution for time-sensitive installations.

ARDEX SKM features a non-sanded, creamy texture for easy trowel application, allowing for a true featheredge that eliminates imperfections and surface irregularities. With a working time of approximately 10–15 minutes and walk-on capabilities within 30 minutes at skim coat thickness, it’s engineered for maximum productivity. Its low shrinkage formulation offers excellent adhesion, bond strength, and crack resistance, even in thin applications.

This versatile finishing underlayment is compatible with vinyl, carpet, laminate, engineered hardwood, tile, and other floor coverings, and it supports installation over radiant heated subfloors and moisture-insensitive areas. With a low VOC content and contribution to LEED® credits, ARDEX SKM is an environmentally responsible choice. Each 10 lb. bag covers approximately 150 to 200 sq. ft. at skim coat depth, making it an efficient and economical option for both large surface areas and detailed spot patching.

ARDEX SKM meets or exceeds industry standards for surface preparation and is backed by the ARDEX SystemOne™ warranty when installed in conjunction with approved adhesives.

Installation

Mixing Ratio: 1.5 quarts (1.4 L) of water per 10 lb. (4.5 kg) bag
For smaller batches, use 3 parts powder to 1 part water by volume
Coverage: 150 – 200 sq. ft. (14 – 18.5 sq. m) per bag at a skim coat
Coverage will vary depending on the texture of the surface being smoothed.