- 1). Cover the fireplace with a layer of builder's felt. Attach the fabric horizontally with staples. Start at the bottom of the fireplace and work your way up. Allow a 2-inch lap on the builder's felt.
- 2). Attach metal mortar lath over the builder's felt using staples. Position the lath so the cups are facing up. You can determine this orientation by running your hand up the lath. If it's correct, the surface should feel smooth. If not, the surface will feel rough.
- 3). Mix veneer mortar until it's the consistency of creamy peanut butter. Spread a 1/2-inch layer of veneer mortar over the lath, making sure you cover the lath entirely. Smooth the mortar with a notched trowel. Allow the mortar in this scratch coat to dry overnight.
- 4). Lay out the stone veneer design on a piece of canvas. Allow a finger's width between each stone. To install the stone, start with the top of the fireplace opening and then do the sides of the opening. Next, cover the sides of the fireplace and finish with the rest of the field. Work from top to bottom. Follow this same pattern as you work on your design.
- 5). Score the backs of edge pieces that need cutting with a grinder. Gently tap the stone with a hammer to make a clean break.
- 6). Mix more mortar. Lightly spray the back of the first stone with water. Butter the back with mortar and then set the stone in place. Push the stone firmly to seat it in the scratch coat. Repeat this process with the rest of the stones. Allow the mortar to dry.
- 7). Fill a mortar bag with mortar mixed to the consistency of pudding. Starting at the top of the fireplace, pipe mortar between the stones. Allow the mortar to set for an hour, and then run a striking tool over the joints to give them a finished look. If you wish, you can brush the joints with a whisk broom as well. Let the mortar cure for several days before you use the fireplace.
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