Advanced Systems For Concrete Flooring Over Wood Sub Floors

Ardex Engineered Cement's system for creating concrete flooring over wood, an advanced self leveling underlayment solution.

Ardex has delivered the industries first high-performance self leveling compound for use over interior wood or concrete sub floors that delivers the ultimate...

  • smooth
  • flat
  • hard surface

for the ceramic tile installer. 

Does NOT require lath mesh or additives.

ARDEX Liquid BackerBoard®  is a pourable, Portland cement-based self leveling floor compound that replaces traditional backer board for a faster, easier, seamless installation over

  • wooden sub floors
  • concrete
  • terrazzo
  • ceramic tile and epoxy

eliminating the need for the ceramic tile contractor or ceramic tile installer to cut, fit, glue, fasten and eliminates other time consuming steps.

When used to smooth and level wood subfloors, ARDEX Liquid BackerBoard does NOT need lath mesh. 

It is suitable for use with in-floor electrical heating systems and ceramic tile or stone can be installed in as little as 6 hours.

Providing a flatter, smoother and more durable surface….and provides a more efficient and less expensive installation overall.

ARDEX Liquid BackerBoard’s pristine smooth and flat surface cannot be achieved with traditional hard, inflexible backer board sheets.

It eliminates uneven wobbling and cracking of large format tiles, and the need for additional back-buttering to compensate for the dips and uneven surfaces of backer board sheets. 

  • does NOT require lath mesh or additives
  • replaces bulky, time consuming and expensive backer board
  • portland cement based


  • walk on in 2 to 3 hours
  • lay tile or stone flooring in just 6 hours
  • excellent coverage – 32.5 sq. ft. per 50 lb. bag
    (one bag  = 2.5 to 3 backer board sheets)


  • easy installation – mix with water, pour and smooth
  • suitable with electrical floor heating systems
  • install up to 1 ¼”


Ardex GS-4 is floor leveling compound used to smooth and repair a gypsum substrate that is UN suitable to receive new finish flooring.

Ardex GS-4 is also recommended for use over structurally sound plywood, OSB and strip flooring.

The product description is a self leveling repair underlayment used for repairing and finishing gypsum and wood substrates above grade prior to the installation of new floor covering.

When mixed with water it produces a pourable or pump able liquid compound that seeks it own level and produces a smooth and flat hard surface.

Wood sub floors must either be...

  • solid hardwood flooring a minimum of ¾” tongue and grove
  • APA-rated TYPE 1 exterior exposure plywood
  • Or approved OSB underlayment board

Ardex GS-4 can be installed from ¼” up to 2” neat coat and up to 5” with aggregate.

Watch a YouTube video demo featuring the installation of Ardex liquid backer board on a wooden substrate.

Watch a self leveling floor compound video from YouTube  featuring the installation of Ardex liquid backer board on a wooden substrate.

Ardex K-15 is designed specifically for fast leveling of wooden subfloors and concrete floors.

Ardex K-15 provides a durable , flat and smooth concrete flooring over wood surface with minimum labor and installation time.

Ardex K-15 will level and smooth concrete and other subfloors prior to the installation of...

  • resilient floors
  • ceramic tile
  • carpeting


  • wood strip
  •  parquet floors
  • Athletic floors

One of the most common problems in renovation and remodeling of existing buildings is the flattening and smoothing of wooden sub floors such as plywood and strip flooring prior to the installations of new floor covering.

Problems with wooden floors...

  • Wooden floors move under stress
  • expand with temperature and humidity changes
  • joints between boards can be very pronounced
  • the surfaces often rough and uneven with deviation up to several inches in 10 feet

Covering these floors with another layer of plywood underlayment or other underlayment board is labor intensive and can result in floor elevation problems at doorways and hallways.

In addition, if the floor is already uneven the addition of such overlays will not produce a surface which will meet the floor covering manufacture's flatness tolerance.



A self leveling floor compound is the solution for uneven wooden floors.

The mesh-reinforced Ardex K-15 plus E-25 underlayment system is a successful fast track method which allows the installation of a high quality self leveling underlayment in a thin layer(3/8” minimum)with the strength and flexibility to withstand normal wood movement and traffic stress.

The result, a concrete flooring over wood surface that is smooth, hard and suitable for any type of flooring material.

Signature Concrete Products Corryton, Tennessee 37721 is an Ardex/Henry System One factory certified installer. If you have a wood sub floor problem, Signature Concrete Products has the solution.

Ardex-Henry System One Floor Leveling Certificate

Please use the contact form provided below if you need additional information or have a wooden sub floor project requiring smoothing and leveling.


return from concrete flooring over wood to signature concrete stain

Please use this form to Contact
Signature Concrete Products

Please note that all fields followed by an asterisk must be filled in.
Please enter information in the text block about your project
First Name*
Last Name*
E-Mail Address*
Home Phone*
City*
State/Prov*
Zip/Postal Code*

Please enter the word that you see below.