DIY Tips for Closing Hardwood Floor Gaps: Save Money and Hassle!

Hardwood floors are a beautiful addition to any home, but over time, due to foot traffic, furniture movements, and weather changes, gaps may start to appear between the planks. Not only do these gaps look unsightly, but they can also cause drafts and even damage to your flooring. But before you call in the professionals and spend a fortune on repairs, why not try some DIY tips to close that hardwood floor gaps yourself?

With a little bit of time and effort, you can save money and hassle while giving your floors a fresh new look. In this article, we’ll share some expert tips and tricks for closing hardwood floor gaps, so you can enjoy a smooth and seamless surface in no time. So, grab your tools, and let’s get started!

Understanding hardwood floor gaps

Hardwood floor gaps are spaces or openings between the planks of your flooring. These gaps may range from a few millimeters to several centimeters, depending on your hardwood floors’ age, type, and quality. Some gaps may be barely visible, while others may be wide enough to fit a coin or a pencil. Hardwood floor gaps are more common in older or poorly installed floors, but they can occur in new or high-end floors as well. The main cause of hardwood floor gaps is seasonal changes in temperature and humidity. When the air is dry, hardwood floors shrink and create gaps. When the air is moist, hardwood floors expand and close the gaps. This natural process is known as wood movement or dimensional change.

Reasons for hardwood floor gaps

Apart from seasonal changes, there may be other reasons why your hardwood floors have gaps. Some of the most common reasons include:

– Poor installation: If your hardwood floors were not installed properly, they may have gaps from the beginning. For example, if the planks were not acclimated to the room’s humidity and temperature, they may have expanded or contracted after installation, leaving gaps.

– Moisture issues: If your subfloor or crawl space has moisture problems, such as leaks, flooding, or high humidity, your hardwood floors may absorb the moisture and swell or buckle, creating gaps. Similarly, if you mop your floors excessively or use too much water, you may cause the planks to warp or gap.

– Dryness issues: If your indoor air is too dry, your hardwood floors may shrink and create gaps. This may happen in winter when you turn on your heating system and dry out the air. If you live in a dry climate or use air conditioning, you may also experience hardwood floor gaps.

– Age and wear: If your hardwood floors are old or have been subjected to heavy traffic, they may develop gaps due to wear and tear. The planks may shift, loosen, or split, creating gaps in the process.

Importance of addressing hardwood floor gaps

Although hardwood floor gaps may seem like a minor issue, they can have several negative effects on your home and your health. Here are some reasons why you should address hardwood floor gaps as soon as possible:

– Energy loss: Hardwood floor gaps may allow air to leak in and out of your home, which can increase your energy bills and decrease your comfort. You may feel drafts, cold spots, or heat loss, especially near the gaps.

– Moisture damage: Hardwood floor gaps may allow moisture to penetrate your floors and subfloor, which can cause rot, mold, and mildew. These issues can weaken your floors and compromise your indoor air quality.

– Dirt and debris: Hardwood floor gaps may trap dirt, dust, and debris, which can make your floors look dirty and dull. You may find it hard to clean the gaps with a broom or a vacuum, as they may be too narrow or deep.

– Tripping hazards: Hardwood floor gaps may create uneven surfaces that can pose a tripping hazard, especially for children, seniors, or people with mobility issues. You may stub your toe or twist your ankle if you step on a gap or catch your shoe on a protruding nail.

– Pest infestations: Hardwood floor gaps may provide entry points for pests, such as ants, termites, or rodents. These pests can damage your floors, subfloor, insulation, and wiring, and pose health risks to your family.

DIY tools and materials needed to close hardwood floor gaps

Now that you know why hardwood floor gaps are a problem, let’s see what you need to close them yourself. Here are the tools and materials you will need:

– Wood filler: This is a putty-like substance that you can use to fill in the gaps between your hardwood planks. Wood filler comes in various colors, so you can choose one that matches your floor’s color or stain. You can find wood filler at most hardware or home improvement stores.

– Putty knife: This is a flat, flexible tool that you can use to apply the wood filler to the gaps. You can also use a scraper or a trowel if you don’t have a putty knife.

– Sandpaper: This is a coarse or fine paper that you can use to sand the wood filler after it dries. Sandpaper helps to smooth out the surface and blend the color of the wood filler with the surrounding planks.

– Vacuum cleaner: This is a machine that you can use to clean up the dust and debris before and after sanding. You can also use a broom or a dustpan if you don’t have a vacuum cleaner.

– Safety gear: This includes gloves, goggles, and a mask or a respirator. Wood filler and sandpaper may produce dust and fumes irritating your skin, eyes, and lungs. Wear protective gear to avoid any health risks.

Step-by-step guide for closing hardwood floor gaps

Now that you have all the tools and materials, let’s see how to close hardwood floor gaps step by step. Follow these instructions carefully, and you’ll have a smooth and seamless floor in no time.

Clean the gaps

Use a vacuum cleaner or a broom to clean the gaps between the planks. Make sure to remove any dirt, dust, or debris that may interfere with the wood filler. You may also use a damp cloth to wipe the gaps if they are sticky or stained.

Prepare the wood filler:

Open the wood filler container and stir it well with a putty knife or a stick. Make sure to mix it thoroughly to ensure consistent color and texture. If the wood filler is too thick, you may add some water or a solvent to thin it out.

Apply the wood filler:

Use a putty knife or a scraper to apply the wood filler to the gaps. Press the filler firmly into the gaps and smooth out the surface. Make sure to fill the gaps and avoid leaving any air pockets or bumps. You may apply more than one layer of wood filler if the gaps are too wide or deep.

Let the wood filler dry:

Wait for the wood filler to dry completely, according to the manufacturer’s instructions. This may take a few hours or overnight, depending on the type and brand of wood filler. Don’t sand the wood filler while it’s wet, as it may smear or clump.

Sand the wood filler:

Use coarse or fine sandpaper to sand the wood filler after it dries. Sand in the direction of the wood grain, and be gentle to avoid scratching or gouging the surrounding planks. Sand until the wood filler is smooth and flush with the floor. You may switch to finer sandpaper for a smoother finish.

Clean up the dust:

Use a vacuum cleaner or a broom to clean up the dust and debris from sanding. Make sure to remove all the dust and debris from the gaps and the surrounding area. You may also use a damp cloth to wipe the floor if it’s still dusty or dirty.

Enjoy your new floor:

Admire your handiwork and enjoy your new and improved hardwood floor. Walk on it gently and avoid dragging heavy furniture or sharp objects across it. You may also apply a coat of finish or wax to protect the floor and enhance its shine.

Preventing hardwood floor gaps in the future

Now that you’ve learned how to close hardwood floor gaps, you may wonder how to prevent them from happening in the future. Here are some tips to help you maintain your hardwood floors and minimize the risk of gaps:

– Keep your indoor air at a moderate humidity level, between 30% and 50%. You may use a humidifier or a dehumidifier to regulate the humidity, depending on the season and the climate.

– Avoid excessive mopping or wet cleaning of your hardwood floors. Use a dry mop or a vacuum cleaner instead, and spot-clean spills or stains with a damp cloth.

– Trim your pets’ nails regularly to prevent scratches and dents on your hardwood floors. You may also use rugs or mats in high-traffic areas to protect the floors.

– Lift heavy furniture or appliances instead of dragging them across your hardwood floors. Use felt pads or furniture coasters under the legs or feet of your furniture to distribute the weight and prevent dents.

– Inspect your hardwood floors periodically for signs of wear, damage, or gaps. Address any issues promptly to prevent them from getting worse.

Common mistakes to avoid when closing hardwood floor gaps

Closing hardwood floor gaps may seem like a simple task, but it requires some skill and attention to detail. Here are some common mistakes to avoid when closing hardwood floor gaps:

– Using the wrong color or type of wood filler: Make sure to choose a wood filler that matches your floor’s color and type. Don’t use a generic or mismatched wood filler, as it may look odd and ruin the appearance of your floor.

– Applying too much or too little wood filler: Use the right amount of wood filler to fill the gaps, but not excessively. Don’t overfill the gaps, as it may create bumps or air pockets. Don’t underfill the gaps, as it may leave gaps or cracks.

– Sanding too aggressively or unevenly: Use gentle and consistent pressure when sanding the wood filler. Don’t sand too aggressively or you may damage the surrounding planks or create depressions. Don’t sand unevenly or you may create waves or ridges on the floor.

– Forgetting to clean up the dust and debris: Make sure to clean up the dust and debris from sanding thoroughly. Don’t leave any dust or debris in the gaps or on the floor, as it may affect the adhesion and appearance of the wood filler.

– Rushing the process: Take your time and follow the instructions carefully. Don’t rush the process or you may make mistakes or overlook important steps. Allow the wood filler to dry completely before sanding or cleaning, as it may affect the quality and durability of the repair.

When to seek professional help for hardwood floor gaps

Closing hardwood floor gaps yourself can save you money and hassle, but it may not be suitable for all situations. Here are some cases when you may want to seek professional help for hardwood floor gaps:

– Large or complex gaps: If your hardwood floor gaps are too large, too deep, or too complex to fill yourself, you may need a professional to assess the damage and recommend a solution. For example, if your subfloor or joists are affected, you may need to replace them or reinforce them before fixing the gaps.

– Structural issues: If your hardwood floor gaps are caused by structural issues, such as foundation problems, settling, or shifting, you may need a professional to inspect your home and recommend a solution. Fixing the gaps alone may not solve the underlying issue and may lead to more damage in the future.

– Health or safety concerns: If your hardwood floor gaps are caused by mold, rot, or pest infestations, you may need a professional to remove them safely and prevent them from spreading. These issues may pose health risks to your family and require specialized equipment and expertise to address.

– Warranty or insurance coverage: If your hardwood floors are still under warranty or covered by insurance, you may need to hire a professional to fix the gaps to avoid voiding the warranty or coverage. Check your warranty or insurance policy for details.

Cost savings of DIY vs professional hardwood floor gap repair

Closing hardwood floor gaps yourself can save you money compared to hiring a professional. The cost of DIY hardwood floor gap repair may depend on the size, number, and severity of the gaps, as well as the type and brand of the wood filler and the sandpaper. However, as a rough estimate, you may expect to spend around $50 to $100 for a small to medium room. This cost includes the wood filler, the putty knife, the sandpaper, the vacuum cleaner, and the safety gear. You may also need to factor in the cost of your time and effort, as well as any mistakes or rework you may encounter.

On the other hand, hiring a professional to fix your hardwood floor gaps may cost you around $200 to $500 per room, depending on the same factors. This cost includes the labor, the materials, and the tools needed to fix the gaps. Hiring a professional may save you time and hassle, as well as ensure a high-quality and long-lasting repair. Moreover, some professionals may offer a warranty or a guarantee for their work, which can give you peace of mind.


Hardwood floor gaps may be a common problem, but they don’t have to be permanent. With the right tools, materials, and technique, you can close hardwood floor gaps yourself and save money and hassle. However, before you start the repair, make sure to understand the causes and effects of hardwood floor gaps, as well as the tips and tricks to prevent them in the future. Moreover, be aware of the common mistakes to avoid and the cases you may need to seek professional help. Following these guidelines, you can enjoy a smooth and seamless hardwood floor for years and impress your guests with your DIY skills.

Also, read the detailed article on how to fix gaps in Hardwood flooring. Step by step.Here.

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