Have you noticed unsightly gaps between your floorboards? Don't let these spaces detract from your home's aesthetic. There are several effective solutions to fill gaps between floorboards, ensuring a smooth, uniform, and visually appealing surface. Let's delve into the best methods to achieve this, from DIY options to professional solutions.
Understanding Floorboard Gaps
Floorboard gaps are common, especially in older homes or those with natural wood flooring. They can be caused by various factors, including wood shrinkage due to changes in humidity, improper installation, or the home settling over time. Before filling gaps, it's essential to understand their cause to prevent them from reappearing.
Preparation: Clean and Sand
Before filling gaps, ensure the area is clean and dry. Vacuum the gaps to remove any dirt or debris. Then, lightly sand the surrounding floorboards to help the filler adhere better. Wipe the area with a damp cloth to remove dust, and allow it to dry completely.

Option 1: Wood Filler
Wood filler is an affordable and easy-to-use solution for filling gaps between floorboards. It's available in various colors, allowing you to match it to your flooring. Here's how to use it:
- Choose a wood filler that matches your floor color as closely as possible.
- Apply the filler into the gap using a putty knife or a gap-filling tool.
- Allow the filler to dry according to the manufacturer's instructions.
- Sand the excess filler flush with the floor surface using fine-grit sandpaper.
- Stain and seal the filled gap to match the surrounding floor.
Option 2: Bondo Wood Filler
Bondo wood filler is a two-part epoxy filler that provides a strong, durable, and water-resistant repair. It's ideal for larger gaps and can be sanded, shaped, and painted like wood. Here's how to use it:
- Mix the Bondo according to the manufacturer's instructions.
- Apply the mixed Bondo into the gap using a putty knife or a gap-filling tool.
- Allow the Bondo to cure completely, usually within 30 minutes.
- Sand the excess Bondo flush with the floor surface using fine-grit sandpaper.
- Stain and seal the filled gap to match the surrounding floor.
Option 3: Grout
For wider gaps, grout can be an effective solution, especially if you have a tile or stone floor nearby. It's available in various colors and can be mixed to match your flooring. Here's how to use it:

- Choose a grout color that matches your floor.
- Mix the grout according to the manufacturer's instructions.
- Apply the grout into the gap using a grout float or a putty knife.
- Allow the grout to set for the recommended time, usually around 15-30 minutes.
- Wipe away excess grout with a damp sponge.
- Allow the grout to cure completely, usually 24-72 hours.
- Seal the grout to protect it from moisture and stains.
Professional Solutions
If the gaps are extensive or you're not comfortable filling them yourself, consider hiring a professional. They have specialized tools and techniques to fill gaps and ensure a long-lasting, high-quality result. Some professionals may use:
- Expandable foam: A quick and easy solution for larger gaps, but it may require additional sanding and finishing.
- Hardwood flooring: For extensive gaps, professionals may replace the affected floorboards with new hardwood flooring.
- Engineered wood flooring: A more affordable alternative to hardwood, engineered wood can be used to replace or install over existing flooring.
Before choosing a solution, consider the size of the gaps, the material of your flooring, and your budget. Each method has its advantages and disadvantages, and some may be better suited to your specific situation than others. With the right approach, you can fill gaps between floorboards and restore your flooring to its former glory.
Don't let gaps between floorboards detract from your home's beauty. With these effective solutions, you can fill gaps and achieve a smooth, uniform, and visually appealing surface. Whether you choose a DIY option or hire a professional, you're sure to find a solution that meets your needs and budget.
More Details
29.06.2022 ... Highly recommend DraughtEx! Its like a stretchy roll of grey foam pipe you tuck into the gap, it sits just below and mimics the natural shadow ...

06.02.2025 ... Gap filling wooden floorboards? You might have heard the old-school glue and wood dust trick, but let's be real… it's outdated!

07.05.2023 ... For filling gaps in flooring, alternatives to wood putty include using a mixture of sawdust and glue, colored caulking or silicone, and epoxy ...

22.02.2018 ... saw dust mix with floor joint filler covers smaller gaps(works well with dyes or colours applied after), bigger gaps can be filled with pine ...

Filling gaps is not recommended — timber expands and contracts, causing filler to crack, break out, and look worse over time. The only reliable exception is ...

05.12.2024 ... To fill substantial gaps in your wooden floor, you can use wood filler, which is designed for this type of repair. However, for deeper gaps, ...

30.09.2023 ... The best way to fill the gaps for floorboards!!! I always get asked many questions when people see me doing this kind of work so hopefully ...

The best thing to do is to check your hardwood flooring in the humid season when the gaps are the tightest. If your gaps are roughly 1/25 inch – 1/16 inch wide, ...

10.05.2021 ... Then using your paint tool or putty knife, press the oakum into the gap between the wood planks. You want to push it down below the planks ...

04.11.2023 ... Fill Floorboard Gaps - Secret Pro Method!! 23K. Dislike. 559. Share. Video unavailable. This content isn't available. Skip video.

23.06.2024 ... You need a flexible wood filler, putty, or caulk. Any one of the three would work depending on your desired final look but you have your use a ...

01.03.2017 ... Sawdust and boiled linseed oil mixed into a paste is the way to go for this if you really want to fill them( as others have said you don't have to ).

01.09.2025 ... For wood strips, apply wood glue into the gap, insert the strip, and use a hammer to tap it into place gently. If using wood dust and resin, ...

17.01.2020 ... Caulk between boards with natural-fibre rope or cord (sisal, hemp, or jute), sized to fit the gaps. For a stained floor, dip the cord in ...

02.04.2017 ... I'd guess that's probably wood filler instead of caulk. A trick hardwood flooring guys use is to cut long strips of "wedges" with a 7 degree ...

19.02.2019 ... I assume you're talking about hardwood floors? Depending on the width of the gaps, you can use an epoxy filler or wood filler. Some people also ...

Should you fill gaps between floorboards? Yes, you should fill gaps between ... Fill Gaps: Use wood filler, rope, or sealant to block drafts. Add ...

Pine slivers are used to fill gaps between floorboards and give your floor a professional finish. 'Slivering' quickly and easily fills gaps between wooden ...

14.10.2023 ... ... use SAFETY precautions when following the tutorials on these videos ... How To Fix Gaps Between Baseboard And Floor For Perfect Fit!

11.11.2023 ... 4531 Likes, 140 Comments. TikTok video from Danny_Sandhouse (@danny_sandhouse): “Learn the best method for filling gaps in floorboards using ...
