If you've been scrolling through renovation photos lately, you've probably wondered how is a brick slip fixed to a building to make it look so authentic. It's a clever little trick, really. You get the rugged, classic look of a solid brick wall without the massive weight, the foundation requirements, or the sheer cost of laying thousands of full-sized bricks.
But while they look like the real deal once they're up, the process of actually getting them to stay on the wall is a bit more involved than just "gluing them on." Whether you're looking at a DIY project for a feature wall or you're curious about how those massive new apartment blocks get their brick finish, the methods vary depending on the scale and the surface. Let's dig into the nitty-gritty of how these things actually stick.
It all starts with the surface
Before you even think about opening a tub of adhesive, you have to look at what you're sticking the slips to. You can't just throw them onto a peeling, painted wall and hope for the best. The surface—or the "substrate" if you want to be fancy—needs to be rock solid, clean, and flat.
For most internal projects, people are usually fixing them to plasterboard, cement board, or even existing masonry. If you're working on the exterior of a building, it's often a bit more complex. You might be looking at concrete, exterior-grade plywood, or specialized insulation panels. The main thing is that the wall needs to be able to take the weight. Even though brick slips are thin (usually around 15mm to 20mm), a whole wall of them adds up to a significant amount of "pull" on that surface.
If the wall is dusty or porous, a good primer is essential. It's like painting a room; if you skip the prep, the finish will eventually let you down. The primer ensures the adhesive actually grips the wall instead of just soaking into it or sitting on a layer of dust.
The "Sticky" Method: Adhesive and Elbow Grease
For the vast majority of residential projects, the answer to how is a brick slip fixed to a building is high-performance adhesive. This isn't your run-of-the-mill craft glue; it's a cement-based, polymer-modified adhesive that's designed to handle moisture and temperature changes.
The process usually follows a rhythm. First, you apply the adhesive to the wall using a notched trowel. This creates those little ridges you see on tile jobs, which help create a vacuum and even out the pressure when the brick is pressed in.
But here's a pro tip: "back-buttering" is your best friend. This means you also smear a thin layer of adhesive onto the back of the brick slip itself before pushing it onto the wall. This ensures 100% coverage. If you have gaps back there, moisture can get in (especially outside), freeze, and eventually pop the brick right off the wall. Nobody wants a "flying brick" situation on their driveway.
Keeping things straight
Unless you're going for a very "rustic" (read: messy) look, you'll want your rows—or courses—to be straight. This is where spacers come in. They're usually T-shaped and come in various thicknesses, typically 10mm to match a standard mortar joint.
You start from the bottom and work your way up. It's also a good idea to use a laser level or at least a very long spirit level to draw a few "master lines" across the wall. Bricks, even the thin ones, aren't perfectly uniform. If you just trust your eyes, by the time you reach the top of the wall, you might find your rows have a bit of a wave to them.
Mechanical systems for bigger jobs
When we talk about how is a brick slip fixed to a building on a larger, commercial scale, the adhesive method isn't always the go-to. For tall buildings or modern timber-frame constructions, architects often use mechanical fixing systems.
These usually involve large panels or tracks that are bolted directly to the building's frame. The brick slips are then either manufactured into the panels in a factory (pre-cast) or they're designed with little grooves that "clip" into a metal rail system.
Why do it this way? Speed and safety. On a high-rise, you don't really want to be hand-gluing thousands of tiny bricks while hanging off a scaffold. These mechanical systems also allow for "rainscreen" designs, where there's a small gap behind the bricks for air to circulate, keeping the building's main structure dry and healthy.
The magic of the corner brick
One of the biggest giveaways of a "fake" brick wall is how the corners look. If you just butt two flat slips together at a 90-degree angle, you see the seam, and it looks like a cheap stage set.
To fix this, manufacturers make "pistol bricks" or L-shaped corner units. These are fixed exactly like the flat ones, but because they wrap around the corner, they give the illusion that the wall is made of full-depth, solid bricks. When someone asks how is a brick slip fixed to a building so it looks real, the answer is almost always "they used the proper corner pieces."
Pointing: The finishing touch
Once all your bricks are stuck on and the adhesive has cured (usually 24 to 48 hours), the wall still looks a bit weird. You've got all these gaps and you can see the gray adhesive behind them. This is where "pointing" comes in.
Pointing is the process of filling those gaps with mortar. You can do this the old-fashioned way with a pointing trowel, but for brick slips, most people use a mortar gun—which is basically a giant icing bag for cement.
You squeeze the mortar into the joints, let it "semi-set" until it's firm to the touch, and then use a jointing tool (a curved piece of metal) to smooth it out. This step is what really "fixes" the look of the building. It seals everything up, protects the adhesive from the elements, and provides that final bit of structural integrity to the surface.
Why things sometimes go wrong
It's not all sunshine and rainbows. I've seen a few "brick slip fails" in my time. Usually, it's because someone tried to rush the job or ignored the weather.
If you're fixing slips to the outside of a building and it starts pouring rain, the adhesive can get diluted and lose its strength. Similarly, if it's too hot, the adhesive can dry out before it's had a chance to properly bond with the brick. Timing is everything.
Another common mistake is not cleaning the back of the slips. Since they're cut from real bricks, they often come covered in a fine red dust. If you don't wipe that off with a damp cloth, you're basically sticking your adhesive to the dust, not the brick. A week later, the brick might just slide right off, leaving the adhesive perfectly stuck to the wall.
Is it a DIY job?
So, now that you know how is a brick slip fixed to a building, you might be wondering if you can do it yourself. For an internal feature wall? Absolutely. It's basically just heavy-duty tiling. If you've got a level, a trowel, and a bit of patience, you can transform a room in a weekend.
However, if you're looking at the exterior of a two-story house, you might want to call in the pros. Dealing with heights, weathering, and the sheer volume of mortar pointing required can turn a "fun project" into a nightmare pretty quickly.
At the end of the day, brick slips are a fantastic way to add character to a building. They're durable, they look great, and as long as they're fixed with the right prep and the right adhesive, they'll stay there for decades. Just remember: prep the wall, back-butter those bricks, and don't forget the corner pieces!