How To Hang a Heavy Mirror

Hanging a heavy mirror can be daunting, but most homeowners can do it successfully with the right techniques and tools. In the video above, This Old House general contractor Tom Silva shares his expert tips for hanging heavy mirrors or pictures securely on different wall types.

Appropriate Hardware for Different Wall Types

Before hanging your mirror, you’ll need to know your wall type to select the proper hardware. Different wall materials require specific methods to keep the mirror securely in place.

Plaster Walls

Plaster walls are common in homes built before the 1940s. These walls require special consideration because of their brittle nature. Do not use a standard drywall hanger that can damage the plaster. Silva recommends using toggle bolts with picture hanging hooks if you have plaster walls:

• Drill a hole large enough to accommodate the toggle bolt.
• Thread the machine screw through the toggle bolt nut.
• Pinch the wings flat and push through the wall hole.
• Pull back on it and tighten the screw until the toggle contacts the back of the wall.

Drywall

For more modern homes with drywall, there are several options for hanging heavy mirrors securely:

• Standard picture hanging hooks
• Large screws that drive directly into the drywall
• Plastic anchors for lighter loads
• Molly bolts for medium-weight items
• Toggle bolts for the heaviest mirrors

Determining Mirror Weight and Hardware Capacity

Make sure you know the mirror’s weight before selecting your hanging hardware:

• Use a bathroom scale to weigh the mirror: Place the mirror on the scale to get its weight. You can also weigh yourself twice, once empty-handed and once holding the mirror, and calculate the difference.
• Check the weight rating on your chosen fasteners: Make sure the hardware can handle the weight.
• Consider using multiple fasteners for added security: This helps distribute the weight evenly and provides greater stability.

Choosing a Location for Your Mirror in Different Rooms

Consider the mirror’s height, especially in rooms like the bathroom or bedroom. Place it at eye level for most users to create a functional piece for everyone. Placing mirrors opposite windows in living rooms can reflect natural light, making the space brighter and more inviting. Each room has its own considerations, so tailor your approach accordingly.

Positioning the Mirror

Follow these steps to mark the correct placement of your mirror:

1. Hold the mirror against the wall at the desired height.
2. Mark a short line on the wall to represent the top edge.
3. Measure down from the top of the mirror to the hanging wire.
4. Transfer this measurement down from the line on the wall.
5. Use a level to make sure the mirror hangs straight.

Silva emphasizes the importance of measuring and marking carefully, especially if you’re using more than one hook. The distance between the hooks affects the distance between the wire and the top of the mirror. He uses a scrap piece of wood to make more accurate marks.

Installing the Hanging Hardware

Once you’ve determined the position and chosen the appropriate hardware, it’s time to install the fasteners. Here’s how to do it on drywall:

1. Mark the spots for your fasteners using the measurements from the previous step.
2. If using two hooks, check that they’re level. 
3. Install the fasteners according to the manufacturer’s instructions.

For plaster walls, follow the toggle bolt installation method described earlier in the article. Always double-check the specifications on your hardware to make sure it’s suitable for your wall type.

Hanging the Mirror Safely

With the hardware in place, you’re ready to hang your heavy mirror. This often requires two people for larger mirrors:

1. Lift the mirror carefully, keeping it level.
2. Align the wire or mounting brackets with the installed hardware.
3. Slowly lower the mirror onto the fasteners.
4. Adjust the mirror so that it’s level and centered.

Silva recommends using two fasteners for heavy mirrors, even if one is rated to hold the full weight. This gives you additional security and allows for minor adjustments in positioning. 

Tips for Long-Term Mirror Security

To make sure your heavy mirror stays securely fastened over time, follow these additional tips:

• For extremely heavy mirrors, consult a professional about proper installation.
• Regularly check the tightness of the fasteners.
• Inspect the wall around the mirror for any signs of stress or damage. Look for cracks or other issues.
• Consider using adhesive strips at the bottom corners to prevent the mirror from shifting.

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