Step 15: Grout the Stones: Fill the Joints With Grout

the tip of a grout bag applying grout to the stone when creating a stone veneer fireplace surround
Photo: Wendell T. Webber
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Cut the tip off the end of a grout bag, sizing your cut to the joint width. Fill the bag halfway with fresh grout mixed to the consistency of pudding. Twist the wide end of the bag shut, and squeeze grout toward the tip until all the air bubbles are gone and the grout reaches the opening. Starting with vertical "head" joints and moving on to horizontal "bed" joints, fill the joints with grout, always using an upward pulling motion as you work. (For the head joints, use a step stool if necessary to reach the highest stones.) Fill the joints until the grout is flush with or protrudes slightly from the face of the stones.
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    Tools List

    • studfinder
      Stud finder
    • staple gun
      Staple gun
    • hammer
      Hammer
    • flat finishing trowel
      Finishing trowel
    • notched trowel
      Tiling trowel with 3/8-inch notch
    • angle grinder
      Grinder fitted with a diamond masonry blade
    • brick trowel
      Brick trowel
    • brick hammer
      Brick hammer
    • grout sponge
      Grout sponge or spray bottle
    • grout bag
      Grout bag
    • masonry striking tool
      Masonry striking tool
    • Whisk Broom
      Whisk broom

    Shopping List

    1. Stone veneer. Get about 20 percent more than you need to cover your fireplace, to accommodate fit and breakage.

    2. Builder's felt. It acts as a moisture barrier between the mortar and your walls to prevent water damage.

    3. Metal lath to install over the felt. It keeps the mortar in place, creating a base for the stone veneer.

    4. 3/8- or ½-inch staples.

    5. 15/8 -inch galvanized roofing nails.6. Veneer mortar. It contains special additives to create a strong bond between the stone veneer and the surface to which it's attached.

    7. Plastic sheeting. Tape it to your walls, floor, and hearth to protect them while you work.

    8. Painter's tape.

    9. Old drop cloth (optional).