How To Install Stacked Stone Veneer on a Fireplace

Upgrading your fireplace with a stacked stone veneer can transform the look of your living space and add texture, depth, and a touch of rustic elegance to any room. In this article, we’ll guide you through installing stacked stone veneer on a fireplace, from the preparation to the finishing touches. Ask This Old House mason, Mark McCullough, demonstrates the installation process and offers expert tips and techniques.

Preparing the Fireplace Surface for Stone Veneer

Before adding the stone veneer, prepare the fireplace surface for proper adhesion:

1. Clean the existing fireplace surface with a soft-bristled brush, removing dirt, dust, and debris.
2. If the surface has paint, install a wire lath to provide a better bonding surface for the mortar.
3. Measure the fireplace surround and cut the wire lath to size.
4. Attach the wire lath to the fireplace surround using masonry anchors.

Installing the Hearth

A well-installed hearth sets the stage for the rest of your project. Follow these steps to properly install a fireplace hearth:

1. Remove the existing hearth material using a masonry hammer and chisel.
2. Clean the exposed surface thoroughly. Any leftover debris can weaken the new installation.
3. Mix Type S mortar according to the manufacturer’s instructions.
4. Using a margin trowel, apply a layer of mortar to the hearth area and spread it evenly for a balanced surface.
5. Place the new hearthstone onto the mortar bed.
6. Wiggle the stone slightly to confirm good contact with the mortar and settle the stone firmly.
7. Use a level to confirm the hearth is even. Correct any unevenness immediately.

In the video above, Mark emphasizes the importance of creating a tight joint between the hearth and the firebox to prevent embers from falling through. Maintaining a tight seal is important for both safety and visual appeal.

Applying the Stone Veneer

With the hearth in place, you can install the stone veneer on the fireplace surround.

Preparing the Mortar

Properly prepared mortar provides strong adhesion and longevity of the veneer. Mix Type S mortar according to the manufacturer’s instructions, and add an adhesive bonding agent to improve adhesion.

Installing the Stone Veneer

Follow these steps for a safe and efficient stone veneer installation:

1. Wet the back of each stone piece with a sponge before applying the mortar. This prevents the stone from absorbing too much moisture from the mortar.
2. Using a margin trowel, apply a layer of mortar to the back of each stone. Make sure the layer is even and covers the entire back surface.
3. Press the stone firmly against the prepared surface, starting from the bottom and working your way up.
4. Use a mallet to gently tap the stone into place, ensuring good contact with the mortar.
5. Stagger the joints between stones for a more natural look. Avoid repetitive patterns for authenticity.
6. Using a wet saw, cut stones as needed to fit around the firebox and edges.

Mark demonstrates that avoiding aligning joints vertically is extremely important, as this can create an unnatural appearance. The goal is to achieve a seamless and natural-looking stone facade.

Incorporating Corner Stones

Corner stones can create a professional, finished look. Consider the following tips for incorporating them effectively:

• Check their alignment to maintain a clean line through the corners.
• Choose corner stones that match the overall veneer to create a cohesive appearance.
• Make sure the corners are tightly butted to avoid visible gaps.

Making Adjustments On-The-Fly

Adjustments may be necessary to create a perfect fit when installing stone veneer. Keep extra mortar on hand to fill any gaps during placement, and use a margin trowel to smooth and adjust the stone before the mortar fully sets, which helps promote a seamless and polished finish.

Finishing Touches to Your Fireplace

To complete your fireplace makeover, pay attention to these final details:

• Allow the mortar to set for the manufacturer’s recommended time. Rushing this step can compromise the quality.
• Clean any excess mortar from the stone surface using a damp sponge.
• If desired, apply a sealer to protect the stone—this makes cleaning easier and enhances the longevity and beauty of the veneer.
• Install any additional elements, such as a mantel or decorative trim, to add character to your newly upgraded fireplace.

Maintenance and Care of Your Fireplace

Regular maintenance keeps your new stone veneer fireplace looking its best for years to come. Dust it regularly with a soft brush or vacuum attachment to prevent dirt buildup that can dull the stone’s appearance, and clean any spills immediately to avoid staining and keep the stone looking fresh. 

Avoid using harsh chemicals or abrasive cleaners, as they can damage the veneer and mortar. Additionally, inspect the mortar joints annually and repair any cracks or gaps to maintain the integrity and appearance of your fireplace.

Resources

Mark installed a stacked stone veneer by Eldorado Stone in the color “Chapel Hill,” with Type S mortar and an adhesive bonding agent, all of which were provided by Sansoucy Stone.

For the hearth material, Mark installed a slab of bluestone, which he got from Cavicchio Greenhouses.

You can find the other tools and materials required for this project, including the masonry drill, wire mesh, and masonry hammer, at home centers.

Materials

• Sponge
• Stacked stone veneer
• Stone for hearth
• Type S mortar
• Wire lath

Tools