How To Seal A Fireplace Insert?

As a homeowner, you can learn how to seal a fireplace insert. During winter, the fireplace insert provides warmth and comfort in your living area. The seal around the fireplace installation deteriorates gradually, causing energy loss and air leaks. Sealing your fireplace insert is a reliable solution to preventing drafts and maintaining efficiency. 

In this post, we curated a detailed step-by-step guideline on how to seal a fireplace insert. In addition, we highlighted a method on how to perform a simple seal test. At the end of this post, check out the common FAQs regarding fireplace inserts.

Materials & Tools

To ensure the successful sealing of your fireplace insert, you must gather the necessary materials. The materials needed for this procedure include;

• Kraken Bond High-Temperature Black Fireplace Sealant 
• Caulking gun
• Wire brush
• Vacuum cleaner
• Scissors
• Masking Tape
• Clean cloth 
• Candle 
• Paintbrush
• Putty knife
• Protective gear (gloves, safety glasses)

Step 1: Preparation

The first step is to prepare the fireplace insert properly before applying the sealant. Here are the 5 steps of how to prepare your fireplace insert;

1. Ensure the Fireplace is Cool: The fireplace insert must be turned off and cool during the sealing job. This is because you cannot apply the sealant while it is hot. That said, turning the fireplace insert off at least a few hours before you begin sealing it is important.
2. Check for Damage: Carry out a visual inspection of the fireplace insert to check for any sign of damage. Ensure there is no crack, gap, or broken part. Address any small damage immediately using a strong sealant. For major damage, consult a professional for repair.
3. Clean the Area: Use a vacuum cleaner to clean the interior of the fireplace insert thoroughly. Next, use a cloth soaked in mild detergent water to clean dirt, dust, and soot from the fireplace insert.
4. Dry the Fireplace: After cleaning the fireplace insert, dry the area properly. Sealant adheres easily on dry surfaces.
5. Protect Surrounding Areas: Cover any adjacent walls or floors around the fireplace insert with masking tape. This will help prevent sealant from spilling onto the floor or other surfaces on the fireplace insert.

Step 2: Remove Old Sealant

The next step is to use a putty knife or wire brush to remove any existing sealant. Removing old sealant is necessary to ensure a clean surface for the new sealant.

Step 3: Apply New Sealant

The next step after removing the old sealant is to apply a new one. Follow these steps to learn how to seal a fireplace insert;

1. Cut the Nozzle: To ease application, cut the tip of the tube at 45 degrees using scissors. The size of the cut depends on the width of the gap you want to seal. The smaller the cut, the thinner the sealant bead.
2. Load the Caulk Gun: Load the sealant on the caulking gun. As a beginner, here is how to use a caulk gun.
3. Apply the sealant: Apply the sealant continuously along the edges of the fireplace insert. While applying the sealant, focus on the cracks and gaps. To achieve an even application, hold the caulk gun at a 45-degree angle and apply steady pressure while dispensing the sealant. To control the application of the sealant, work in sections rather than applying the sealant at a go.
4. Smooth the sealant: Smoothen the sealant using your finger or paintbrush while it is still wet. Smoothing the sealant helps achieve an even application and produce a clean finish.
5. Remove Masking Tape: After smoothing, remove the masking you used to protect the surrounding areas. 

Step 4: Let The Sealant Cure

The next step after applying the sealant on a fireplace insert is to allow it to dry completely. Allow the seal to dry for a couple of hours, at least 24 hours. When the sealant is completely dry, it creates a strong bond. Here are other tips to follow to ensure the sealant cures properly.

• Read the Manufacturer's Manual: Fireplace sealants have different drying times. Check the manufacturer's manual to determine the appropriate curing time for the sealant you used.
• Avoid touching the sealant: Do not touch the sealant before it dries to avoid smearing it.
• Ventilation: Ensure the surrounding area is properly ventilated to allow the sealant to dry faster.

Step 5: Inspect The Seal (Check For Gaps)

The next action after application is inspection. Carry out a visual inspection for missed spots and gaps. Apply the sealant immediately on any missed spots. After the visual inspection of the fireplace insert, follow these steps to carry out a simple seal test;

Prevent air circulation by closing the fireplace damper. This will help create a controlled environment and prevent air movement from the fireplace insert. 

Light up a candle and hold it next to the fireplace insert.

Test the seal by observing the candle flame. If there is a gap, the flame will move to prove air movement from the fireplace insert. Otherwise, it means the fireplace insert is properly sealed.

FAQs:

What Are The Signs That My Fireplace Insert Needs Resealing?

Visible cracks, drafts, and reduced heating efficiency are common signs that a fireplace insert needs a new seal. Furthermore, your fireplace insert needs resealing if you experience the release of smoke or smell gas in your living area.

How Often Should I Reseal My Fireplace Insert?

Resealing your fireplace insert should be done annually. However, there should be regular inspections for cracks, leaks, or gaps. Routine maintenance should done twice a year.  

Can I Use Regular Caulk To Seal My Fireplace Insert?

Regular caulks cannot withstand heat. Thus, they are unsuitable for sealing a fireplace install. The only type of caulk suitable for a fireplace insert must withstand high temperatures. 

How Do I Remove Old Sealant From My Fireplace Insert?

Use a scraper, wire brush, or putty knife to remove old sealant from your fireplace insert. It is recommended that the old sealant be removed before installing a new one.

How Long Does It Take For The Fireplace Sealant To Cure?

Generally, it takes 24 hours for a fireplace sealant to cure properly. Always read the manufacturer’s manual to see the curing time for your chosen fireplace sealant. 

Can I Seal A Fireplace Insert Myself, Or Should I Hire A Professional?

Installing a fireplace insert seal can be done as a DIY project or by hiring a professional. As a beginner, it is recommended that you hire a professional. For subsequent sealing projects, follow a detailed installation guide on how to seal a fireplace seal.