DIY Guide: Fixing Gaps in Hardwood Floors with Sanding and Sealant

DIY Guide: Fixing Gaps in Hardwood Floors with Sanding and Sealant

Ever walked across your hardwood floors and noticed an annoying creak or a gap that wasn’t there before? You’re not alone. Over time, hardwood floors can develop gaps due to temperature changes, humidity, and natural settling of the house.

But don’t worry, you don’t have to live with those unsightly gaps. With a few tools and some elbow grease, you can fix those gaps and restore your hardwood floors to their former glory. This guide will walk you through the process, step by step, so you can get your floors looking like new again.

Key Takeaways

  • Thorough inspection of hardwood floor gaps is the first step in successful repairs. This process includes documenting the varying sizes of the gaps across the floor, which is crucial for selecting the right filler material and tools required.
  • Choosing the correct tools greatly impacts the success of the hardwood floor gap repair job. Tools include a suitable wood filler, putty knife, sandpaper, wooden strips for large gaps, and a shop vacuum for clean up.
  • The choice of filler material is crucial. Where wood putty is best suited for areas with heavy foot traffic and variable humidity due to its flexibility, wood filler is ideal for static areas due to its hardness, smooth finish, and resistance to cracking.
  • The application of the filler material requires precision. The amount depends on the depth and length of the floor gap and should be slightly under the floor level. Achieving a smooth surface is vital.
  • The final steps are sanding for an even surface and applying a sealant or finish to protect the floor from further gaps and damage. The color and type of sealant depend on the homeowner’s preference and the condition of the floor.

Addressing gaps in hardwood floors can restore their beauty and structural integrity. shares a DIY guide on how to effectively use sanding and sealants to fix these gaps, preserving the floor’s appearance and longevity. For deeper insights into selecting the right sealants and understanding the sanding process, offers professional recommendations and techniques.

Inspecting the Gaps

Inspecting the Gaps

Inspecting the Gaps is your first step towards restoring your hardwood floors. It’s not a process to rush- taking the time to properly assess and understand the nature of these gaps will determine your success in fixing them.

So, how do you inspect these gaps? For a start, visual inspection is your best friend. Start by thoroughly sweeping or vacuuming your floor. This is to clear out any dust, debris, or gunk that could interfere with your inspection. If the gaps are still filled with dirt after this, try gently picking it out with a thin, non-abrasive tool like a plastic knife.

After the cleaning, walk around your space and mark out the areas with noticeable gaps. Some gaps may be thin and barely visible, while others may be wider and quite obvious. Cataloguing these will aid your further action plan.

Next, consider the size of your gaps. Are they uniform across your floor, or do they vary? This might seem trivial, but let’s not forget: the goal here is a meticulous inspection. Small and uniform gaps could be an indication of regular expansion and contraction of the wood, while non-uniform or overly-large gaps could hint at a more serious underlying issue- such as damage to the subfloor.

Note down these observations in a notebook, or better yet, take photos. Documenting will prove beneficial when you move on to procuring materials or discussing your issues with professionals. You’ll appreciate the importance of these details when it comes to the actual repairing.

Lastly, remember that in the world of hardwood flooring, gaps aren’t always a sign of an issue. In fact, gaps in hardwood floors are a natural occurrence and can often be left alone if they’re not causing other problems. However, if the gaps become excessive or lead to draughts, then it’s definitely worthwhile to intervene.

In the end, your inspection should leave you with a clear image of what you’re dealing with. Once you’ve got all these details, you’re primed to take the next step: getting the right tools for the job. With this guide by your side, you’re not only journeying towards a better floor, you’re gaining a better understanding of your home, too.

Gathering the Necessary Tools

Gathering the Necessary Tools

You’ve completed the inspection, documented the gaps and cleaned the floor. Now it’s time to gather the tools you’ll need to start fixing those gaps in your hardwood floor. Here’s a rundown of what should be in your repair kit to ensure a successful restoration.

Firstly, you’ll need a good-quality wood filler. Depending on the size of the gap, you’ll need to decide between latex and epoxy fillers. For larger gaps that could potentially expand and contract with changes in humidity, epoxy is your go-to choice. It’s durable and adheres well to wood surfaces. For smaller gaps, latex fillers are perfect as they’re easy to use and clean up.

Next on the list is a putty knife. This tool is essential for applying the wood filler into the gaps. Choose a knife that’s the right size for your gaps to make the process smoother.

A sandpaper is another must-have tool. After applying the filler, you’ll need to ensure that the filled areas are smooth and blend in with the rest of the floor. You will need a finer grit sandpaper for this purpose.

For those instances where gaps are too large to be filled, you might need to consider wooden strips. These can be inserted into the gaps and then sanded down for a seamless finish.

Another handy tool to have in your arsenal is a shop vacuum. This will help you keep the work area tidy, sucking up any dust and debris from the sanding process and giving you a clear view of your progress.

Remember – the right tools are essential for a successful hardwood floor gap repair job. Now that you have your toolkit ready, let’s talk about the restoration process itself and how you can bring your old hardwood floors back to life.

Wood FillerFilling in the gaps
Putty KnifeApplying the wood filler
SandpaperSmoothing over the filled gaps
Wooden StripsFilling in large gaps
Shop VacuumCleaning up dust and debris from the sanding process, keep the area tidy

Choosing the Right Filler Material

Continuing on our path to mending those hardwood floor gaps, let’s move to a crucial section: choosing the right filler material. It’s not just about spotting the gaps, cleaning them out, and gathering your tools. Part of the process also relies massively on your choice of filler material. Making a wrong pick can lead to poor results, no matter how meticulous your gap fixing routine is.

So, what exactly should you be looking at? Well, there are two major types of filler material you can consider: wood putty and wood filler. Both have their unique properties, uses, and reasons why you might prefer one over the other.

Wood Putty

Wood putty, also known as plastic wood, is oil-based and doesn’t harden completely. This property allows for flexibility, making it a great match for parts of the floor that experience heavy foot traffic or are prone to “floating“, expansion, and contraction due to humidity. Its adaptability to changing conditions can save you from a pesky redo.

Let’s look at the perks of using wood putty:

  • It’s durable
  • Resistant to shrinking and cracking
  • Remains flexible after drying

Wood Filler

On the flip side, there’s wood filler. Unlike wood putty, fillers are water-based, and they harden after application. While they lack the flexibility of their counterparts, they make up for it in smoothness and stability. They’re paintable, stainable, and perfect for static areas of your floor.

Considerable advantages of wood filler are:

  • It’s sandable after drying
  • Can be painted or stained
  • Resistant to cracking

Remember, the choice between wood putty and wood filler depends largely on the specific conditions of your floor and the location of the gaps. Assess your situation accurately, and choose wisely. Moving on, we’ll discuss how to apply these filler materials effectively to get that seamless hardwood floor you’ve been dreaming about.

Applying the Filler

Applying the Filler

The first step is figuring out how much filler you’ll need. It’s not as simple as you may think. The amount of filler depends on the depth and the length of the floor gap. For longer and deeper gaps you’ll need more filler, and vice versa.

When it comes to applying your chosen filler, whether it’s wood putty or wood filler, precision plays a key role. Small builder’s spatula is a great tool for this purpose. Load the blade with your filler and push it into the gaps. You’ll be tempted to overfill the gap – don’t. The filling should be slightly under the floor level. If it’s not perfect on the first go, don’t worry. You can always add more if necessary.

Then comes the smoothing process. It’s vital to achieve a uniform, seamless surface. With your spatula, scrape across the filled gap. Aim to have a smooth, flat surface. Check the filled gaps from different angles to ensure uniformity. Remember, fine grit sandpaper is your friend in smoothing out filler.

If you’re using wood filler, here’s an important point to remember. Wood filler hardens after application. That’s why it’s important to sand down the excessive material as soon as it starts to harden. The opposite applies for wood putty. As it remains flexible even after drying, you have the liberty to sand it down later.

The key is to apply, check, correct, and reapply if necessary. Yes, it might require a bit of hard work, but the result will be a seamlessly repaired hardwood floor that promises longevity and boosted aesthetic appeal. It’s simple really – by knowing your floor condition, and the unique properties and benefits of fillers, you can make an informed choice and create an impressive DIY floor repair!

Sanding and Finishing

Now that you’ve filled the gaps, you’re ready to move on to the Sanding and Finishing. Get this right and your hardwood floor will be as good as new. Let’s unpack how you can turn your floor from drab to fab!

Firstly, you want to ensure your floor is smooth and even. This is where your sandpaper comes into play. You’ll break up the excess dried filler that might be perched on the floor’s surface. If you’ve been diligent in your filler application, you’ll find this a pretty straightforward task.

Choose a fine grit sandpaper and gently work in the areas where you applied the filler. Aim to even out the floor and wipe off the excess carefully. Your goal here isn’t to induce a polished shine, simply remove roughness for the sake of uniformity.

Let’s talk about sealing the deal. What we mean is, you must apply a sealant or a finishing layer that’ll protect your floor from further gap-induced injuries. It’ll ensure the longevity of your hardwood floor and keep those nasty gaps from making a comeback.

There’s a range of options when considering sealants. Your selection will hinge on the type of your hardwood floor, its color, and your personal preferences. It could be a clear sealant for a natural look or a tinted one to provide a color lift.

Remember, darker tints can help mask imperfections better than the clear ones. So, if your floor has seen better days, you may want to opt for a darker tint.

A quick summary of counts:

Filler Application1

The secret to effective sealing lies in proper application. Use a paintbrush or foam applicator and move in the direction of the wood grains. This helps the sealant sink into the wood, providing deeper protection. Apply generously, let it dry, and revisit with another layer if needed.

Phew, we are making some serious progress here. But hold on, we’re not done yet. Let’s dive straight into the next step, shall we?


You’ve come a long way in your DIY hardwood floor repair journey. You’ve learned how to fill gaps, sand down excess filler, and apply a protective sealant. You’ve discovered the importance of choosing the right sealant color and applying it in the direction of the wood grains. You now understand that multiple layers might be necessary for deeper protection. With these steps, you’re well on your way to restoring your hardwood floors to their former glory. Keep up the great work, and remember, patience and persistence are key in any DIY project. Here’s to your success in achieving a beautifully restored hardwood floor!

What is the significance of using fine grit sandpaper in hardwood floor repair?

Using fine grit sandpaper smooths out any excess filler, creating a uniform surface. It makes your hardwood floor appear seamless and professionally finished.

Why is it important to apply a sealant or finishing layer to the hardwood floor?

Applying a sealant or finish provides an extra layer of protection to your floor. It helps to avoid future damage from everyday wear and tear, maintaining the beauty and longevity of your hardwood floor.

How to choose the right sealant for my hardwood floor?

The choice of sealant depends on the specifics of your floor like its type and color, as well as your personal preferences. Darker tints are usually preferred if you wish to mask any imperfections.

What is the correct way to apply the sealant on the hardwood floor?

Ensure you paint the sealant using a brush or foam applicator in the direction of the wood grain. This method usually provides deeper protection and promotes a more natural-looking finish.

Should I use multiple layers of sealant on my hardwood floor?

Yes, you might need to apply multiple layers of sealant for thorough protection. The need for multiple layers usually depends on the floor’s condition and the type of sealant used. Regular monitoring and maintenance can help assess the need for additional layers.