Alright, folks, gather ’round! Today, I tackled a little project I’ve been putting off: gluing a brick to a fireplace mortar joint. Sounds simple enough, right? Well, let me tell you, it’s a bit more involved than just slapping some glue on and calling it a day.
Prepping the Area
First things first, I gotta clean both the brick and the mortar joint. I mean when dealing with any kind of adhesive, a clean surface is key, like when you cooking, you start with a clean pot, right?.
![How to Glue a Brick to a Fireplace Mortar Joint?](https://www.refractorymat.com/wp-content/uploads/2025/02/2c8e116784958e3080cee2859d8e6c3a.jpeg)
![How to Glue a Brick to a Fireplace Mortar Joint?](https://www.refractorymat.com/wp-content/uploads/2025/02/2c8e116784958e3080cee2859d8e6c3a.jpeg)
- I grabbed a stiff-bristled brush and scrubbed the heck out of the mortar joint. Got rid of all the loose bits, dust, and whatever else was lurking there.
- Then, I took a damp cloth and wiped down the brick, making sure there was no dust or grime on the surface I’d be gluing.
Choosing the Right Adhesive
Now, this is important. You can’t just use any old glue for this. I needed something that could handle high temperatures, since, you know, it’s a fireplace.
I went with a high-heat resistant adhesive specifically designed for masonry. It’s a bit pricier than regular construction adhesive, but trust me, it’s worth it. Don’t want that brick falling off mid-winter, do ya?
Applying the Adhesive
Okay, time for the sticky part.
- I put on my gloves and safty glasses.
- I loaded up my caulking gun with the adhesive.
- Then, I applied a generous bead of adhesive to the back of the brick. I made sure to get good coverage, especially around the edges.
- I also applied a small amount into the mortar joint itself, just for extra grip. Can’t hurt, right?
Setting the Brick
Now for the moment of truth.
I carefully positioned the brick onto the mortar joint, pressing it firmly into place. I made sure it was level and aligned with the other bricks.
Then, and this is crucial, I braced the brick. I used a couple of pieces of wood and some clamps to hold it securely in place while the adhesive cured. You don’t want it shifting around while it’s drying.
![How to Glue a Brick to a Fireplace Mortar Joint?](https://www.refractorymat.com/wp-content/uploads/2025/02/d9c8aa26fc20ad26e833dae0b72c551d.jpeg)
![How to Glue a Brick to a Fireplace Mortar Joint?](https://www.refractorymat.com/wp-content/uploads/2025/02/d9c8aa26fc20ad26e833dae0b72c551d.jpeg)
The Waiting Game
The adhesive I used takes about 24 hours to fully cure, so it’s a waiting game now. I’ll keep the braces in place for at least that long, just to be safe.
Update: It has passed almost 24 hours! I remove the braces and give it a gentle tug. And it works, It’s solid as a rock, literally!
And that’s it! A seemingly simple project, but with a few important steps to ensure success. If you’ve got a loose brick on your fireplace, give this a try. Just remember: clean surfaces, the right adhesive, and plenty of bracing!