How to Prepare Subfloor for Engineered Wood Flooring

Installing engineered wood flooring requires careful preparation of the subfloor to ensure a smooth and durable result. A properly prepared subfloor not only extends the life of your flooring ...

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Written By :

Ryvon Jastor

Expert Author

Installing engineered wood flooring requires careful preparation of the subfloor to ensure a smooth and durable result. A properly prepared subfloor not only extends the life of your flooring but also prevents common issues like uneven surfaces, squeaks, or shifting boards.

How to Prepare Subfloor for Engineered Wood Flooring

This guide on How to prepare subfloor for engineered wood flooring will walk you through the necessary steps to prepare your subfloor effectively, providing a solid foundation for your engineered wood flooring installation.

Why is Subfloor Preparation Important?

Subfloor preparation is a critical step in achieving a successful engineered wood flooring installation. Without proper preparation, issues such as uneven surfaces, moisture problems, and structural instability can compromise the flooring’s performance and longevity.

An unprepared subfloor could lead to gaps, squeaking, or even visible damage to the flooring over time. Additionally, addressing moisture levels and securing a clean, level base ensures that the engineered wood planks adhere and align properly. By dedicating time to this step, you are investing in a finished floor that not only looks great but also stands the test of time.

Needed Materials

Moisture Barrier (If Needed):

Before beginning the subfloor preparation process, it is essential to test for moisture levels. High moisture levels can cause issues such as warping or buckling of the engineered wood flooring. If your subfloor has a high moisture level, you will need to install a moisture barrier before proceeding with any other preparations.

Leveling Compound:

In cases where the subfloor is uneven, using a leveling compound is necessary to create a smooth and level surface. This step ensures that the engineered wood planks lay flat without any gaps or dips.

Adhesive or Fasteners:

Securing your subfloor to the joists helps prevent shifting and squeaking of the boards over time. Depending on your subfloor type, you may need to use adhesive or fasteners (nails or screws) to secure the subfloor.

Cleaning Supplies:

Before any installation can begin, it is crucial to thoroughly clean the subfloor. This step removes any debris, dust, or dirt that could hinder adhesion or affect the level of the surface.

8 Step-by-Step Guidelines on How to Prepare Subfloor for Engineered Wood Flooring

Step 1: Clean and Inspect 

The first step in preparing your subfloor is to thoroughly clean and inspect the surface. Begin by removing any debris, dust, or dirt using a broom, vacuum, or damp cloth. Ensuring a clean surface is crucial, as any particles left behind can interfere with the installation process and potentially create uneven spots under the flooring. After cleaning, carefully inspect the subfloor for any damage, such as cracks, holes, or loose areas.

The Engineered 
Wood Planks

Address these issues by filling gaps with an appropriate filler or securing loose sections with nails or screws. This step ensures your subfloor is in sound condition and ready for the next preparation stages.

Step 2: Check and Address Moisture Levels

If you are installing engineered wood flooring in a below-grade or high-moisture area, it is essential to check the subfloor’s moisture levels. Use a moisture meter to determine if there is excess moisture present in the subfloor. If your test reveals high levels of moisture, address this issue by installing a moisture barrier before proceeding with any other preparations.

However, if the moisture levels are within an acceptable range (usually between 12% and 14%), you can proceed with the next steps.

Step 3: Address Uneven Surfaces

Using a leveling compound, fill in any dips or low spots on the subfloor. This step creates a smooth and level surface for your engineered wood flooring to sit on without any gaps or dips. Follow the manufacturer’s instructions carefully when applying the leveling compound, as the improper application can cause issues with the flooring’s stability.

The compound usually takes 24 hours to dry, so plan accordingly before proceeding with the next step.

Step 4: Seal and Prime

Next, seal any cracks or gaps in the subfloor using a sealing product appropriate for your subfloor type. This step prevents moisture from seeping through and helps ensure a stable base for the flooring.

After sealing, prime the entire surface with a primer designed for use with engineered wood flooring. Priming also helps improve adhesion and creates a barrier between the subfloor and flooring.

Step 5: Install Underlayment (If Needed)

Underlayment is not always necessary for engineered wood flooring installation, but it can provide additional soundproofing and insulation benefits. If you choose to use underlayment, make sure it is compatible with your flooring and follow the manufacturer’s instructions for installation.

Engineered Wood 
Flooring Installation

If you do not use underlayment, proceed to step 6.

Step 6: Secure Subfloor to Joists

Using the appropriate adhesive or fasteners, secure your subfloor to the joists. This step helps prevent any movement or squeaking of the flooring over time. Follow the manufacturer’s instructions and spacing guidelines for placing fasteners or applying adhesive.

You may need to use shims to level any areas that do not sit flush with the joists.

Step 7: Clean Again 

After completing the previous steps, it is essential to clean the subfloor once more before installing the engineered wood flooring. This final cleaning ensures that any dust, debris, or residue from leveling compounds, sealing, or other materials is removed.

Use a vacuum or broom to clean the surface thoroughly, and if necessary, wipe it down with a damp cloth to capture fine particles. A clean subfloor helps to ensure optimal adhesion and prevents imperfections from appearing beneath the flooring, setting the stage for a smooth and successful installation.

Step 8: Let it Rest

After completing all necessary preparations, let your subfloor rest for at least 24 hours before beginning the installation. This step allows any adhesives or compounds to dry completely and ensures a stable base for your flooring.

Following these eight steps on How to prepare subfloor for engineered wood flooring will help you prepare your subfloor for engineered wood flooring installation, setting the stage for a beautiful and long-lasting floor in your home. Remember to follow the manufacturer’s instructions carefully and seek professional assistance if needed to ensure proper preparation and a successful installation process. Happy renovating!

Additional Tips

  • Always use materials and products that are compatible with your subfloor type and the type of engineered wood flooring you plan to install. Follow the manufacturer’s instructions for the best results.
  • If you are unsure about any aspect of subfloor preparation, seek professional assistance or advice to ensure a successful installation.
  • After completing the installation, regularly check and maintain your subfloor to prevent future issues that could potentially damage your flooring.
  • Once the subfloor is prepared, acclimating your engineered wood flooring for at least 24 hours before installation is crucial. This step ensures the flooring adjusts to the temperature and humidity of your home, preventing future buckling or expansion of boards. Follow the manufacturer’s instructions for proper acclimation methods.
  • Remember to always wear protective gear when working with any chemicals or tools during subfloor preparation. Safety first! 
Essential to Clean
 the Subfloor

Frequently Asked Questions

Q: Can I Install Engineered Wood Flooring Over an Uneven Subfloor?

A: While it is not ideal, you can install engineered wood flooring over an uneven subfloor. However, it is crucial to address any major dips or holes with a leveling compound before installation to prevent any issues with the flooring’s stability or appearance.

Q: Do I Need Underlayment for Engineered Wood Flooring?

A: It depends on your subfloor type and personal preference. Underlayment is not always necessary, but it can provide additional soundproofing and insulation benefits. Make sure to use a compatible underlayment if you choose to use one and follow the manufacturer’s instructions for installation.

Q: How Long Should I Let My Subfloor Rest Before Installing Engineered Wood Flooring?

A: It is best to let your subfloor rest for at least 24 hours after completing all necessary preparations. This allows any adhesives or compounds used in the preparation process to dry completely and ensures a stable base for your flooring.  Always refer to the manufacturer’s instructions for specific recommendations on resting time. 

Q: Do I Need to Clean My Subfloor Before Installing Engineered Wood Flooring?

A: Yes, it is crucial to clean your subfloor thoroughly before installing engineered wood flooring. Any particles left behind can interfere with the installation process and potentially create uneven spots under the flooring. Make sure to use a vacuum or broom to clean the surface and wipe it down with a damp cloth if necessary.

Q: Can I Install Engineered Wood Flooring in High Moisture Areas?

A: It is not recommended to install engineered wood flooring in high moisture areas, such as bathrooms or basements. High levels of moisture can cause damage to the flooring over time. If you must install engineered wood in these areas, make sure to properly address any excess moisture before installation and regularly monitor for any signs of water damage. As an alternative, consider using waterproof engineered wood flooring specifically designed for high-moisture areas. Always follow the manufacturer’s instructions carefully when installing any type of flooring

Must Install 
Engineered Wood

Conclusion

By following these guidelines on How to prepare subfloor for engineered wood flooring and properly preparing your subfloor, you are setting yourself up for a successful engineered wood flooring installation. Taking the extra time and effort to clean, inspect, address any issues, and level the surface will ensure a smooth and stable base for your flooring.

This preparation process is crucial for achieving a professional-looking and long-lasting floor in your home. Remember to always follow the manufacturer’s instructions and seek professional assistance if needed. Happy renovating!

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