How Do You Fill Gaps Between A Wall And Fireplace? [Step By Step Guide]

If you've ever considered renovating your home, you may have come across a few gaps between your wall and fireplace. Maybe you know what to do with them, but maybe you don't. Fortunately, we did research on the right filling process.

Unsightly gaps between your fireplace and the surrounding wall can be both an aesthetic and a functional problem. Not only are these gaps unsightly, but they can also let in drafts, which can affect both your heating bill and your comfort level.

It's a good thing that filling in these gaps is a relatively simple process that anyone can do, particularly through:

  1. Clean the Surface
  2. Wipe Down the Area Properly
  3. Choose the Right Filler Material and Apply Them Based on Its Instructions

In this post, we'll go over how to fill the gaps between your wall and fireplace step by step so that your home looks as great as new. Let's get started!

Interior of log cabin with firewood and a fireplace, How Do You Fill Gaps Between A Wall And Fireplace? [Step By Step Guide]

How to Prepare Your Wall and Fireplace Before Filling their Gaps?

Before filling the gaps in your wall or fireplace, it's important to take some time to properly prepare the surface.

1. Clean the Surface

Use a vacuum cleaner to remove any dirt, dust, or debris that may be present.

2. Wipe Down Properly

Next, use a damp cloth to wipe down the surface and remove any remaining residue.

3. Choose the Right Filler Material and Apply Based on Its Instructions

Once the surface is clean and dry, you can then begin to fill the gaps with a suitable filler material. When choosing a filler, it's important to select one that is compatible with the type of surface you're working with.

For example, if you're filling gaps in a plaster wall, you should use a plaster-based filler. If you're filling gaps in a wooden trim or paneling, however, you'll need to use a wood-based filler.

Once you've chosen the right filler material, simply follow the manufacturer's instructions for the best results. With a little careful preparation, you can easily fill the gaps in your wall or fireplace and create a perfectly seamless finish.

A fireplace in a modern living room with marble flooring a gray furnitures

What Materials Do You Use to Fill in the Gaps between Your Wall and Fireplace?

There are a variety of materials you can use to fill in the gaps between your wall and fireplace.


Caulking is a common choice because it is easy to apply and comes in a variety of colors. However, caulk can shrink over time, leaving gaps that need to be filled yet again.

  1. The first step is to clean the area around the gap, using a vacuum or a damp cloth to remove any dust or debris.
  2. Next, use a putty knife to apply caulk to the gap. For best results, use a construction-grade caulk, which will be both more durable and more effective at sealing out drafts.
  3. Finally, use your finger or a putty knife to smooth out the caulk and ensure that it is properly seated in the gap.

Once the caulk has dried, you should notice an immediate difference in both the look and feel of your fireplace.

Get high-quality caulk on Amazon.

2. Expanding Foam

Another popular option is expanding foam, which is available in both spray and pourable forms. Expanding foam does an excellent job of filling large gaps, but it can be difficult to control the amount that is dispensed.

  1. The first step is to clean any debris or dust from the area where you will be applying the foam.
  2. Next, insert the nozzle of the foam into the gap and apply evenly. Be sure to wear gloves and a mask to protect yourself from the fumes.
  3. Once the foam has dried, you can trim any excess with a knife.
  4. Finally, caulk any visible cracks or gaps for a finished look.

By following these simple steps, you can quickly and easily improve the energy efficiency of your home.

Check expanding foam on Amazon.

3. Felts

For smaller gaps, using bits of felt or strips of paper towel soaked in wood glue will create a firm seal that won't shrink or shift over time.

Simply apply the strips to the gap and let them dry. The felt will create a barrier that will help prevent heat from escaping, while the paper towel will help to fill any voids. 

Regardless of the material you choose, taking the time to fill in the gaps between your wall and fireplace will help create a more finished look.

Challenges of Filling in the Gaps between a Wall and Fireplace

Interior of a rustic inspired modern living room with a fireplace and sunflowers for decoration

One of the challenges that comes with filling in the gaps between a wall and fireplace is making sure that the wall is level. If the wall is not level, then the fireplace will not be level.

In addition, the gap between the wall and fireplace needs to be big enough so that there is room for the fire to breathe. The fire needs oxygen to burn, and if the gap is too small, then the fire will not be able to get enough oxygen and will go out.

Another challenge that comes with filling in the gaps between a wall and fireplace is making sure that the materials used are heat and fire resistant. The last thing you want is for your house to catch on fire because you used the wrong materials!

Make sure to use heat-resistant materials, such as bricks or stone, when filling in the gaps between a wall and a fireplace.

Finally, one last challenge that comes with filling in the gaps between a wall and fireplace is making sure that there are no air leaks. If there are air leaks, then smoke from the fire will escape into your home.

In addition, if there are air leaks, then it will be difficult to keep the fire going. Make sure to seal up any gaps so that smoke cannot escape and so that you can keep your fire burning brightly all night long!

Benefits of Filling the Gap between Your Wall and Fireplace

One important but often overlooked aspect of home maintenance is filling the gap between your wall and fireplace. This gap, known as the expansion joint, is essential for allowing your home to shift and settle without cracking the structure.

A huge luxurious modern living room with a fireplace and laminated flooring

Over time, the expansion joint can become damaged or broken, which can lead to serious problems. In addition to being a potential fire hazard, a damaged expansion joint can also allow water and insects into your home.

Besides that, fixing the cracks and gaps on your wall and fireplace and help to improve energy efficiency.

By regularly checking and filling the gap between your wall and fireplace, you can help to avoid these costly repairs.

How to Properly Maintain Your Fireplace and Wall?

As the colder months approach, many of us will be reaching for the wood and kindling to light a cozy fire in our fireplaces. But, it's important to remember that a fireplace is not just a decoration - it's a working appliance that needs to be properly maintained.

Here are some tips on how to keep your fireplace and wall in good condition:

First, make sure that your fireplace is clean before you start using it. A build-up of soot and ash can be dangerous, so it's important to sweep it out regularly. Once a week should be sufficient, but you may need to do it more often if you're using your fireplace frequently.

Next, inspect your chimney regularly for any signs of damage. Look for cracks or loose bricks, and make sure that there's no debris blocking the flue. If you notice any problems, have them fixed as soon as possible by a professional.

Finally, don't forget to give your fireplace a good clean once a year using a top-notch cleaning agent. This will remove any accumulated soot and ash, and help to prevent any potential fires.

Always follow the manufacturer's instructions when cleaning your fireplace. By following these simple tips, you can help to ensure that your fireplace is safe and efficient all winter long.

Should You Fix Gaps Between A Wall And Fireplace or Hire a Professional?

Many homeowners have a gap between their walls and the fireplace. Some people try to fix this problem themselves, while others hire a professional.

There are pros and cons to both options.

A gas fireplace

If you decide to fix the problem yourself, it is important to do your research. Make sure you know what materials you need and how to properly install them. Otherwise, you could end up causing more damage than good.

Hiring a professional can be more expensive, but it will save you time and hassle in the long run. A professional will know exactly how to fix the problem and will likely do a better job than someone who is not experienced in this type of repair.

Ultimately, the decision of whether to fix your wall-to-fireplace gaps yourself or hire a professional depends on your budget, your level of experience, and your personal preferences.

Final Words

Interior of log cabin with firewood and a fireplace

Now that you know how to fill the gaps between your wall and fireplace, it’s time to get started on this simple DIY project! Be sure to follow all of the steps closely, and if you have any questions, don’t hesitate to ask professionals. Once you finish this project, you’ll be able to enjoy a warm, cozy fire without having to worry about those unsightly gaps.

For more decorating ideas and other DIY tips, see our posts below:

How To Update A Stone Fireplace [8 Awesome Ideas]

How To Whitewash A Stone Fireplace With Chalk Paint

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