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Filling Hardwood Floor Gaps with Easy DIY Techniques

Want to restore the flawless look of your hardwood floor? Unsightly gaps can be easily fixed, no matter the size. Whether you have a few minor gaps or larger spaces between boards, there are simple and effective methods to make your floor look like new.

In this guide, we'll walk you through different ways to fill gaps in your hardwood floor, helping you choose the best technique for your situation.

Key Takeaways:

  • Easy DIY methods for filling gaps: wood filler, wood strips, and sawdust mixes.
  • Choose the best method based on the gap size and your skill level.
  • Always test your chosen method before applying it widely.
  • Control humidity levels to prevent future gaps.

Table of Contents

Methods for Filling Gaps in Hardwood Floors

The best method for filling your hardwood floor gaps will depend on the size of the gaps and your desired level of DIY involvement. Here are the most common techniques:

Wood Filler/Putty

This is a pre-mixed compound that comes in various wood tones. Ideal for small to medium-sized gaps, it's the easiest method for most homeowners.

  • Pros: Easy to apply, readily available, comes in different colors.
  • Cons: May not match your wood perfectly, can shrink or crack slightly over time.

Wood Strips (Slivers)

For larger gaps, especially in older plank floors, inserting thin strips of matching wood offers a long-lasting solution.

  • Pros: Strong and stable fill, looks authentic.
  • Cons: Requires more skill and may be harder to source matching wood.

Sawdust and Wood Glue/Resin

Mixing sawdust from your floor with wood glue or resin creates a custom-colored filler for specific repairs and blending.

  • Pros: Best for color matching, inexpensive.
  • Cons: More time-consuming to prepare and apply.

Product Recommendations

If you decide to use wood filler/putty, here are some widely-used and well-reviewed products:

  • Timbermate Wood Filler – Versatile, water-based, comes in various colors.
  • Elmer's Carpenter's Wood Filler – Budget-friendly, available in tubes for small repairs.
  • Famowood Wood Filler– A classic solvent-based choice, offering strength and multiple colors.

Important Note: Always test your chosen gap-filling product on an inconspicuous area of your floor to ensure you're happy with the color match and the results before tackling the whole project.

Step-by-Step Guide: Wood Filler/Putty Method

Materials

  • Wood filler/putty (matching your wood tone as closely as possible)
  • Putty knife
  • Fine-grit sandpaper (120-220 grit)
  • Damp cloth
  • Painter's tape (optional)
  • Wood stain or finish (if desired)

Instructions

  1. Prep the Area: Thoroughly clean the floor and the gaps you'll be filling. Remove any loose dirt or debris using a damp cloth. Allow the area to dry completely. If needed, use painter's tape around the gaps to protect the surrounding wood.
  2. Mix Wood Filler (if needed): Some wood fillers come pre-mixed, while others require mixing with water. Follow product instructions carefully.
  3. Apply the Wood Filler: Use the putty knife to scoop a generous amount of wood filler. Press it firmly into the gap, working in multiple directions to ensure it's fully packed. Slightly overfill the gap, as the filler will shrink a little when it dries.
  4. Smooth the Surface: Immediately after filling, use the putty knife to smooth the filler surface, removing any excess. Try to blend it seamlessly with the surrounding floor. Wipe any filler on the wood next to the gap with a damp cloth.
  5. Drying Time: Follow the manufacturer's instructions for drying time. This can range from a few hours to overnight, depending on the product and depth of the gap.
  6. Sanding: Once the filler is completely dry, gently sand the filled area with fine-grit sandpaper until it's flush with the rest of the floor. Wipe away sanding dust with a damp cloth.
  7. Finishing (optional): If your wood floor has a stain or finish, you may want to apply a matching product to the filled area. Test it in an inconspicuous spot first to ensure a good color match.

Important Note: For very deep gaps, you might need to apply wood filler in layers, allowing each layer to dry fully before applying the next.

Step-by-Step Guide: Wood Strips (Slivers) Method

Materials

  • Wood strips (ideally from leftover flooring or matching the existing wood type)
  • Wood glue
  • Hammer or rubber mallet
  • Table saw or hand saw
  • Chisel (optional)
  • Putty knife
  • Fine-grit sandpaper (120-220 grit)
  • Damp cloth
  • Wood stain or finish (if desired)

Instructions

  1. Source Wood Strips: If possible, make wood strips from spare flooring of the same type as your existing floor. If not available, try to find wood that matches the color and grain pattern as closely as possible.
  2. Cut Wood Strips: Measure the width and depth of the gaps carefully. Using a table saw or hand saw, cut the wood strips to slightly wider than the gap but matching the depth. Test the fit in the gap by gently inserting it.
  3. Prepare the Gap (if needed): If the gap's edges are rough or have old filler, carefully use a chisel to tidy up the gap so the wood strip can sit flush. Clean away any loose debris.
  4. Apply Wood Glue: Apply a generous bead of wood glue along the bottom and sides of the wood strip.
  5. Insert the Strip: Carefully insert the wood strip into the gap. Gently tap it down with a hammer or rubber mallet until it's flush with the surrounding floor. If excess glue squeezes, wipe it off with a damp cloth.
  6. Drying Time: Allow the wood glue to dry completely per the manufacturer's instructions. You may want to place a weight or use clamps to ensure the strip stays securely in place while drying.
  7. Sanding: Once the glue is completely dry, carefully sand the wood strip flush with the floor using fine-grit sandpaper. Wipe away any dust with a damp cloth.
  8. Finishing (optional): If your wood floor has a stain or finish, you'll want to match it to the repaired area. Test the stain or finish in an inconspicuous spot first to ensure a good match.

Tips

  • Using leftover flooring is ideal for a seamless look.
  • For even more security, you can apply a small amount of wood glue to the bottom of the gap before inserting the wood strip.
  • If the gap is very wide, you may need to use multiple wood strips side-by-side.

Step-by-Step Guide: Sawdust and Wood Glue/Resin Method

Materials

  • Fine sawdust (from your hardwood floor)
  • Wood glue or resin (clear, drying to a natural wood tone)
  • Small container or piece of scrap wood for mixing
  • Putty knife or craft stick
  • Gloves (optional, but recommended for resin)
  • Fine-grit sandpaper (120-220 grit)
  • Damp cloth
  • Wood stain or finish (optional)

Instructions

  1. Collect Sawdust: Using fine-grit sandpaper, sand a piece of wood that matches your floor. Carefully collect sawdust on paper or cardboard.
  2. Mix with Glue/Resin: In a small container or on a scrap piece of wood, combine the sawdust with your chosen adhesive (wood glue or resin). Start by adding a small amount of glue/resin and gradually add more until you achieve a thick, putty-like consistency.
  3. Apply the Mixture: Use a putty knife or craft stick to apply the sawdust mixture to the gap. Press it carefully to fill the gap. Slightly overfill the gap as the mixture may shrink a little when dry.
  4. Smooth and Clean: Smooth the filler surface with your putty knife or craft stick. Wipe any excess mixture from the surrounding wood with a damp cloth.
  5. Drying Time: Allow the mixture to dry completely. Follow the drying time instructions on your glue or resin product. This may range from a few hours to overnight.
  6. Sanding: Once completely dry, gently sand the filled area with fine-grit sandpaper until it's smooth and level with the surrounding floor. Wipe away any sanding dust with a damp cloth.
  7. Finishing (optional): If you want to closely match the existing finish, apply a matching wood stain or finish to the repaired area. Test it in an inconspicuous spot first to ensure a good color match.

Important Notes

  • Wear gloves if using resin, as it can irritate the skin.
  • Clear resin will give the most natural wood look.
  • Adding more sawdust creates a thicker mixture; add more glue/resin for a thinner one. The ideal consistency is similar to slightly soft cookie dough.

Additional Tips

Preventing Future Gaps

While you can easily fix gaps, preventing them from recurring is even better. Maintain a consistent humidity level in your home (ideally around 35-55%) to minimize wood expansion and contraction. Use a humidifier in dry seasons and a dehumidifier during humid weather.

Matching Wood Finishes

When using wood filler, strips, or making your sawdust mix, achieving a perfect color match can be tricky. Always test your chosen product on an inconspicuous part of the floor (like under furniture or in a closet) to make sure you're happy with the results before tackling visible areas.

When to Seek Professional Help

Most gaps in hardwood floors are DIY-able. However, if you notice major structural issues, gaps accompanied by sloping or warped boards, or extensive damage, it's wise to consult a flooring professional. They can assess any underlying problems and recommend the most appropriate repair solution.

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