The adhesives that reliably stick to brick are polyurethane construction adhesive, epoxy, and specialty masonry adhesive — not general-purpose glue — with the right choice depending on whether the bond is structural, decorative, or outdoor.
Brick is porous, uneven, and often exposed to weather, which is why most ordinary glues fail on it. The adhesives that actually hold brick-to-brick, brick-to-concrete, or objects onto a brick surface are engineered for masonry: polyurethane construction adhesives, two-part epoxies, and cement-based mortars. Which one you need depends on what you’re attaching and where.
Adhesives That Actually Work on Brick
The short rule: use a product explicitly labeled for brick, masonry, concrete, or stone. General-purpose white glue, wood glue, or craft adhesives lack the strength and weather resistance that brick surfaces demand.
Polyurethane Construction Adhesive
The most versatile option for brick projects. It bonds to porous masonry, fills small gaps, and cures to a waterproof, weather-resistant hold. Loctite PL Premium and Gorilla Max Strength Construction Adhesive are widely cited as brick-compatible products, suitable for mounting signs, planters, and decorative blocks to brick walls. Apply with a standard caulk gun, press the object into place, and allow full cure — usually 24 to 48 hours — before loading the bond.
Epoxy Adhesive
Two-part epoxies deliver the highest rigid strength for brick bonding. They’re ideal for load-bearing repairs, attaching metal brackets to brick, or filling cracks before structural work. Epoxy requires exact mixing ratios and cures with minimal flexibility, so it’s less forgiving than polyurethane for outdoor use where expansion and contraction matter.
Masonry or Construction Adhesive
Products labeled specifically as masonry adhesive or landscape block adhesive are formulated for brick, stone, and concrete block. Liquid Nails LN-905 Landscape Block Adhesive and Loctite PL500 Landscape Block Adhesive are designed for retaining walls, brick edging, and stone veneer. These are one-part adhesives that cure to a strong, weather-resistant bond.
Mortar
For structural brick-to-brick bonding — building a wall, repairing a chimney, or setting pavers — mortar or a thin-set masonry system is the traditional and code-compliant choice. Mortar is not a glue; it’s a cementitious binder that cures into a permanent, load-bearing joint. Construction adhesives are not a substitute where the brick itself is structural.
How to Bond to Brick: Steps That Work
The surface preparation determines whether any adhesive holds. Brick that is dirty, damp, dusty, or crumbling will defeat even the strongest product.
- Clean the brick thoroughly. Remove dust, loose mortar, dirt, and any flaking material with a wire brush or pressure washer. Let the surface dry completely — moisture-curing adhesives need a dry surface to bond.
- Pre-fit the piece. Dry-position whatever you’re attaching so the alignment is correct before adhesive touches the brick.
- Apply the adhesive per the manufacturer’s instructions — caulking-gun beads for construction adhesive, mixed to an even color for two-part epoxy.
- Press and hold. Press the object firmly into the adhesive bead. For heavier items, use clamps, bracing, or temporary supports during the cure time.
- Allow full cure. Do not load the bond until the adhesive has fully cured — typically 24 to 72 hours depending on temperature, humidity, and product. Rushing this step is the most common failure.
If you’re looking for a tested product recommendation, our tested roundup of adhesives for brick compares the top-performing options by strength, weather resistance, and project type.
Choosing by Project Type
The best adhesive changes with what you’re building. Use this quick guide:
| Project Type | Recommended Adhesive | Key Consideration |
|---|---|---|
| Brick-to-brick structural wall | Mortar or masonry cement | Load-bearing; must meet building code |
| Mounting decor or planters to brick | Polyurethane construction adhesive | Waterproof; bonds porous surfaces |
| Outdoor sign or address plaque | Polyurethane or epoxy | Must resist rain and freeze-thaw |
| Landscape block wall or edging | Landscape block adhesive | Designed for vertical stone/brick bonding |
| Metal bracket to brick | Two-part epoxy | Rigid bond; exact surface prep required |
| Temporary or lightweight mount | Outdoor mounting tape | Only on smooth, clean brick; lower strength |
For outdoor or wet-exposure projects, prioritize polyurethane or epoxy over acrylic latex or general construction adhesives — polyurethane retains its bond through rain, humidity, and temperature swings, while acrylic latex tends to soften or lose grip in constant moisture.
Common Mistakes to Avoid
Most adhesive failures on brick come from a small set of preventable errors. Skip these and the bond holds:
- Using general-purpose glue. White glue, wood glue, and craft adhesives lack the formulation to bond to masonry’s porous, mineral surface.
- Bonding to dirty or damp brick. Dust and moisture block the adhesive from penetrating the pores. Clean and dry the surface first, every time.
- Ignoring cure time. Construction adhesives need 24+ hours to reach full strength. Loading the bond early pulls the adhesive loose while it’s still elastic.
- Choosing the wrong adhesive for the environment. An indoor-only acrylic adhesive will fail within months outdoors. Check the label for “waterproof” and the temperature range.
- Using adhesive for structural repairs. A cracked or failing brick wall needs mortar or engineered reinforcement, not a construction adhesive. Adhesives are for bonding, not for supporting load-bearing brickwork.