How To Hang A Mirror On Lath And Plaster Wall

How to Hang a Mirror on a Lath and Plaster Wall

Hanging a mirror on a lath and plaster wall requires a slightly different approach than hanging it on drywall. Lath and plaster walls are common in older homes and are known for their unique construction. The plaster is applied directly to a framework of thin wooden strips called laths, creating a solid surface. However, this construction can make hanging objects more challenging due to the lack of solid backing for fasteners. This article will guide you through the steps to successfully hang a mirror on a lath and plaster wall.

Understanding Lath and Plaster Walls

Lath and plaster walls are traditionally built using thin, wooden strips called laths, which are nailed to the wall studs. Plaster is then applied over the laths, creating a smooth, hard surface. This construction method is durable and provides excellent sound insulation. However, it presents challenges when hanging heavy objects, as the laths may not provide sufficient support.

When drilling into a lath and plaster wall, you may encounter a solid lath, a hollow space between laths, or plaster without any lath backing. Each situation requires a different approach to ensure the mirror is securely hung. To determine the type of surface you are dealing with, lightly tap the wall with your knuckles. A solid sound indicates a lath, a hollow sound indicates a space between laths, and a dull sound indicates plaster without lath backing.

Choosing the Right Hardware

The type of hardware you use to hang your mirror depends on the weight of the mirror and the type of plaster wall you are working with. For lightweight mirrors, you may be able to use adhesive hooks or simple picture hangers. However, for heavier mirrors, you will need more robust solutions. Here are some options:

For Solid Lath Backing:

Heavy-duty screw-in hooks: These are available in various sizes and weight capacities and should be chosen based on the mirror's weight.
Toggle bolts: These are ideal for heavier mirrors as they expand behind the wall for greater support. Choose toggle bolts sized appropriately for the weight of the mirror.

For Hollow Spaces Between Laths:

Molly bolts: These expanding bolts are designed to securely hold objects in hollow walls. They are a good choice for hanging heavy mirrors in spaces between laths.
Drywall anchors: These plastic or metal anchors are designed to expand in drywall but can also be used for hollow spaces in lath and plaster walls.

For Plaster Without Lath Backing:

Heavy-duty adhesive hooks: If the mirror is very lightweight and the plaster is in good condition, a heavy-duty adhesive hook may be sufficient.
Specialized adhesive mounts: These are designed for heavier objects and bond strongly to plaster. Follow the manufacturer's instructions carefully.

Hanging Your Mirror

Once you have selected the appropriate hardware, follow these steps to hang your mirror:

Locate the studs: Use a stud finder to determine the location of wall studs. It is essential to secure your mirror directly to a stud for maximum support.
Mark the hanging position: Use a level to mark the desired hanging position on the wall. Be sure to consider the mirror's size and the desired height.
Pre-drill holes: If you are using screws or toggle bolts, pre-drill holes slightly smaller than the diameter of the screw or bolt. This will prevent the plaster from cracking.
Insert the hardware: Insert the chosen hardware into the pre-drilled holes. For toggle bolts, expand the wings behind the wall by turning the bolt clockwise until it is snug.
Hang the mirror: Attach the mirror to the hardware using the provided hanging mechanism.
Level the mirror: Use a level to ensure the mirror is hanging straight before fully tightening the screws or bolts.

Remember to choose hardware that is rated for the weight of your mirror and to follow the manufacturer's instructions carefully. Installing heavier mirrors may require additional support and expertise, so consult with a professional if you are unsure.