Have you noticed gaps between your floorboards? These spaces can develop over time due to seasonal changes or natural wood contraction. You can avoid small gaps, but the larger ones need attention as they can accumulate dust and affect the overall look of your flooring. The good news is that you can fix gaps between floorboards with simpler methods. 

Start by measuring the gaps using a ruler or measuring tape. Then, use wood filler or wood strip techniques to fill the spaces and restore the aesthetics of your home interior. You can also use a gap fixer or natural fiber rope to address this issue. Seeking professional flooring installation services can reduce the likelihood of gaps occurring in the future. 

Why Do Gaps Appear Between Floorboards

Wood naturally shrinks in dry conditions and expands when exposed to moisture. This effect is particularly noticeable in winter when heating systems lower humidity levels. Even engineered wood, which is made to be more stable, can still have gaps if it’s not installed right or experiences a moisture range over 35% to 65% RH. Some users also mention that when filling out these gaps, you should remember the wood’s natural expansion and contraction behavior to avoid damage.

Methods to Repair Gaps Between Floorboards

There are different techniques used to fill spaces between your floorboards. However, to identify the best way, you should assess the gaps first. Then, sort them by size:

• Small — less than 1/16 inch.
• Medium — between 1/16 and 1/4 inch.
• Large — greater than 1/4

The measurement will determine whether you fix it yourself or call in a professional.

Method 1: Use Wood Filler for Small Gaps

You can buy a commercial wood filler or make your own by mixing sawdust from your floor with glue. It is particularly used to fill small to medium-sized gaps in floorboards.

What Materials You’ll Need:

• Wood filer (pre-mixed or mixable)
• Putty knife
• Sandpaper (medium and fine grit)
• Tack cloth or vacuum 
• Wood stain or finish
• Mixing tools

How to Apply:

1. Clean the area to remove any dirt and dust with a tack cloth.
2. Follow a manufacturer’s instructions using a mixable wood filer to achieve a consistent texture.
3. Use a putty knife to smooth the surface of the filer to make it as level as possible with the surrounding floorboards.
4. Allow the material to dry completely. It typically takes a few hours to overnight.
5. Once the filler is dry, use medium-grit sandpaper to remove excess material from the floor’s surface.
6. Apply a wood stain or finish on the filled area to match the color and sheen of the surrounding boards.

Method 2: Apply Wood Strips for Larger Gaps

It is a better option when gaps are consistently wider than ¼  inch. The wood strip method can provide a more stable and long-lasting repair. 

What Materials You’ll Need:

• Spare floorboards
• Wood glue
• Sandpaper 
• Measuring tape
• Table saw
• Hammer 
• Scraper 
• Rag or cloth

How to Apply:

1. First, measure the width and length of each gap.
2. Use a table saw to rip cut strips to the measured size.
3. Apply glue to the sides of each strip. 
4. Insert strips into the gap using a mallet or hammer. Tap gently and make sure they are flush with adjoining boards.
5. Wipe away any excess glue with a rag.
6. Leave it to get dry, and then give the final finish to match the surroundings.

Method 3: Employ Gap Fixer for Floating Floors

A gap fixer is suitable for laminate or engineered wood, where the planks are not glued or nailed to the subfloor. The floor gap fixer method can quickly and easily close the spaces without removing baseboard molding. 

What Materials You’ll Need:

• Gap fixer tool (it’s like a handle with suction cups)
• Mallet 
• Wood sealants
• Putty knife

How to Apply:

1. Begin with the same cleaning process as done in previous methods.
2. Place the wood tool with double-sided tape or a suction tool onto the laminate plank to apply the pressure. 
3. If the gap is small, apply a small amount of sealant into the open tongue and groove spaces. Use a toothpick or low-viscosity glue so it will move deep into the joint.
4. Step on the adjacent flooring to prevent it from moving while sliding the laminate plank to push it back into place. 
5. Use a mallet to knock it onto the floor gently.
6. After the plank is back in place, carefully remove the suction cup or use a flat bar with double-sided tape to remove the wooden tool. 

Method 4: Try Natural Fiber Rope to Plank Floorboards

Filling gaps in plank floorboards with natural cotton or jute rope is a traditional method that enhances a home’s rustic aesthetic. Natural fiber rope is flexible and easy to work with.

What Materials You’ll Need:

• Natural fiber rope
• Protective gloves
• 5-in-1 painter’s tool
• Safety glasses
• Utility knife 

How to Apply:

1. Use the painter’s tool or flathead screwdriver to remove dirt and old putty. 
2. Vacuum the loose debris to ensure the area is clear.
3. Choose a natural fiber rope slightly thicker and longer than the gaps you want to fill. 
4. If desired, saturate the rope with a wood stain to complement the color of your floorboards.
5. Position the rope along the length of the gap. And carefully press it with a knife.
6. Trim any excess rope that protrudes above the floor with a utility knife or scissors.
7. Finally, allow the filled gaps to settle and clean the area. 

Conclusion

Dealing with gaps in floorboards involves assessing the gap size and choosing the method that works best for it. The wood filer is a suitable option for smaller gaps while installing wood strips in the space will be a long-lasting solution for larger ones. Natural fiber rope is a traditional method to fix gaps without making the floor look unnatural. Opt for the right method that aligns with your structure’s needs. However, if you notice too many large or complex gaps, hiring a professional flooring installation contractor is better.