Installing engineered hardwood flooring requires careful preparation of the subfloor to ensure a smooth, durable, and long-lasting finish. Proper subfloor preparation is crucial to prevent issues such as squeaks, uneven surfaces, and future damage. This guide provides essential steps to ensure your subfloor is ready for installation.

Assessing the Subfloor

Before installation, inspect the existing subfloor for damage, moisture, and levelness. Common subfloor materials include plywood, OSB, or concrete. Ensure the surface is clean, dry, and free of debris. Use a level to check for uneven areas that may need correction.

Preparing the Surface

Proper surface preparation involves cleaning and repairing the subfloor:

  • Remove any loose debris, dust, or old adhesive.
  • Fill in cracks, holes, or gouges with appropriate patching compounds.
  • Sand down high spots or uneven areas to create a flat surface.
  • Ensure the subfloor is completely dry, especially if it is concrete.

Leveling and Moisture Control

Levelness and moisture are critical factors:

  • Use a self-leveling compound for uneven concrete or wood subfloors.
  • Check moisture levels with a moisture meter. For wood subfloors, moisture should be within 12%. For concrete, it should be below 3%.
  • If moisture is high, install a vapor barrier or dehumidify the space before proceeding.

Installing an Underlayment

An underlayment provides a smooth surface and additional moisture protection. Choose an appropriate underlayment based on your flooring type and subfloor material:

  • Foam or cork underlayment for soundproofing and cushioning.
  • Moisture barriers for concrete subfloors.
  • Ensure the underlayment is installed flat and without gaps.

Final Checks Before Installation

Before laying the engineered hardwood, verify the following:

  • The subfloor is level within 3/16 inch over 10 feet.
  • The surface is clean, dry, and free of debris.
  • The moisture levels are within acceptable ranges.
  • The underlayment is properly installed and secure.

Following these steps will help ensure a successful installation of engineered hardwood flooring, resulting in a beautiful and durable floor that lasts for years.