How To Hang a Heavy Mirror on Masonry

Hanging a heavy mirror on a masonry surface like brick or stone can be a bit intimidating if you’ve never used a hammer drill. However, with the right tools and techniques, it’s a manageable DIY project, although it requires precision and careful planning to ensure the mirror is securely mounted and level. In this article, we’ll walk you through the process of hanging a heavy mirror on masonry, from measuring and marking to drilling and mounting. In the video above, This Old House general contractor Tom Silva demonstrates the step-by-step process of hanging a large mirror on masonry. 

Tools and Materials Needed for Hanging a Mirror

To hang a heavy mirror on masonry, you’ll need the following:

• Concrete anchors and screws
• Hammer
• Hammer drill with a masonry bit (if you don’t own one, you may want to rent it)
• Level
• Pencil or chalk for marking
• Scaffold or sturdy ladder (scaffolding makes the job easier, but can be an expensive rental)
• Screwdriver
• Tape measure

Steps for Hanging a Mirror on Masonry

Step 1: Measuring and Marking

Follow these steps to measure and mark the installation points:

1. Set up your scaffold or ladder for a stable work platform.
2. Measure the center-to-center distance between the hooks on the back of the mirror.
3. Measure from the bottom of the mirror to the top of the hooks.
4. Determine the desired height for the bottom of the mirror from the mantle or floor.
5. Find the center of the masonry surface where you’ll hang the mirror.
6. Using the measurements from steps 1–3, mark the positions for the mounting hooks on the masonry surface.

Step 2: Drilling and Anchoring

Once you’ve marked the positions for your mounting hooks, it’s time to drill holes and install anchors using a hammer drill. 

Using a Hammer Drill

Hammer drills are the best way to create holes in masonry surfaces. Here’s how to use one effectively:

1. Position the drill bit on your marked spot.
2. Start drilling very slowly, allowing the bit to create an initial indentation.
3. Gradually increase speed as the hole deepens.
4. Drill to a depth of about 1.5 inches or as specified by your anchor instructions.

Silva emphasizes that it’s important to start slow and be gentle when beginning to drill, as the uneven surface of masonry can cause the drill bit to wander.

Installing Anchors

After drilling the holes, it’s time to install the anchors:

1. Choose anchors appropriate for the weight of your mirror and the type of masonry.
2. Insert the plastic anchor into the drilled hole.
3. Gently tap the anchor with a hammer until it’s flush with the surface.
4. Repeat for all mounting points.

Step 3: Mounting the Mirror

With the anchors in place, you’re ready to hang your mirror. This step requires careful handling and may require an extra set of hands for larger mirrors. Follow these steps to securely mount your mirror:

1. Insert screws into the anchors, leaving about 3/4 inch protruding.
2. Lift the mirror carefully, aligning the hooks on the back with the screws.
3. Gently lower the mirror onto the screws, ensuring both hooks are securely seated.
4. Use a level to check that the mirror is straight, adjusting as necessary.

Mirror Hanging Safety Considerations

When hanging a heavy mirror on masonry, keep these safety tips in mind:

• Always use proper lifting techniques to avoid injury. Have someone help you if possible.
• Ensure your scaffold or ladder is stable and secure.
• Wear safety glasses when drilling to protect your eyes from debris.
• Use hearing protection when using the hammer drill.

Alternatives to Drilling When Hanging a Mirror

While drilling into masonry is the most secure method for hanging a heavy mirror, there are alternatives for those who prefer not to drill or are renting their home.

Adhesive Hooks

For lighter mirrors, adhesive hooks designed for masonry surfaces can be an option. Choose hooks rated for the weight of your mirror and clean the surface thoroughly before applying. Follow the manufacturer’s instructions for application and curing time.

Mirror Adhesive

Some specialized mirror adhesives can bond directly to masonry:

• Ensure the surface is clean and dry.
• Apply adhesive according to the product instructions.
• Use temporary supports to hold the mirror in place while the adhesive cures.

Note that these methods may not be suitable for very heavy mirrors or in areas with high humidity.

Maintenance of Your Mounted Mirror

Once your mirror is securely mounted, proper maintenance will ensure it stays safe and looks great for years to come. Periodically inspect your mounted mirror to ensure screws haven’t loosened over time, and look for any signs of stress or cracking in the mirror surrounding the masonry. Take care when you’re cleaning and dusting so you don’t put additional stress on the mirror.

Frequently Overlooked Tips for Hanging a Mirror on Masonry

Hanging a mirror on masonry is not as simple as hanging it on drywall. The brick or stone surfaces present unique challenges. Here are some additional tips that might help you in this project:

• Choose the correct drill bit: Make sure you use a masonry bit designed to handle hard materials like brick and stone. Using the wrong bit can result in uneven holes or even damage to your drill.
• Use a carpenter’s pencil: For marking spots on brick or stone, a carpenter’s pencil works better than chalk. It’s more visible and more durable on rough surfaces.
• Consider the weight distribution: Make sure the weight of the mirror is evenly distributed across the mounting points. This can prevent damage to both the mirror and the masonry surface.

Troubleshooting Common Hanging Mirror Issues

Along the way, you might encounter some problems. Here’s how to address some of the most common issues:

Hole Is Too Large for Anchor

If you accidentally drill a hole that is too large for your anchor, you can still secure the mirror in one of these ways:

• Using a larger anchor: Switch to an anchor that fits the hole.
• Filling the hole: Use a masonry filler to fill the hole, let it dry, and then drill a new, correctly-sized hole.

Mirror Not Level

If your mirror isn’t level, it could be due to:

• Unequal lengths of screws protruding: Ensure the screws are protruding evenly from the wall.
• Misaligned marks and holes: Double-check your measurements and ensure that they align perfectly.

Drill Bit Won’t Penetrate Masonry

If your drill bit isn’t making progress through the masonry, consider these tips:

• Checking the drill’s power setting: Higher power might be required for harder surfaces.
• Changing the drill bit: A dull or worn-out bit may need replacement.
• Applying consistent pressure: Apply firm, steady pressure without forcing the drill.