How to Glue Granite

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Granite used for decorative purposes creates sophisticated stone surfaces which add a natural elegance to any room. Unfortunately, granite poses some small installation problems due to its heavy weight in comparison to other decorative coverings. In order to glue granite into place, you'll need more than a light adhesive. You need a cement-based thin-set mortar to hold the granite in place with any security. The thin-set though will cure hard and fast, guaranteeing a bond between the granite and the subsurface that can last decades, allowing you to enjoy the look of granite for years without any need to worry about it not staying precisely where you glued it in place.

Things You'll Need

  • Sponge
  • Ph-neutral cleanser
  • Scrub brush
  • Degreasing solution
  • Fine-grit sandpaper
  • Tack cloth
  • Stone sealer
  • Paintbrush
  • Thin-set mortar
  • Notched trowel
  • Clean the surface where you intend to glue the granite with a sponge and a pH-neutral cleanser to remove any dirt present which could interfere with the adhesive used. Use a scrub brush instead of a sponge if the dirt is difficult to remove. Remove any oil from the surface with a degreaser created for the surface material as well. Rinse the cleaned surface with water then allow it to dry before gluing the granite in place.

  • Lightly sand non-porous target surfaces such as laminates or painted surfaces to create a slight texture for the adhesive. Use a fine-grit sandpaper to create small scratches over the surface then wipe the sanding residue clear with a tack cloth.

  • Brush the surface of the granite with stone sealant prior to placement if you intend to spread grout over the granite. Use a paintbrush to apply the sealant, covering the granite in a light layer that will prevent staining from the later grout application. Allow the sealant to dry for two hours before continuing.

  • Spread thinset mortar over the surface with a notched trowel. Turn the trowel on edge at a 45-degree angle, and go over the mortar with the notches to create ridges in the material.

  • Press the granite onto the mortar firmly to glue it in place. Use a slight wiggle motion to settle the granite in place and spread the mortar over the rear of the stone. Wipe any mortar from the surface of the granite with a damp sponge, and then allow the mortar to cure according to the recommended wait times supplied by the mortar manufacturer.

Tips & Warnings

  • Grout any joints between adjacent granite after the mortar dries, or place a silicone caulk between the granite on any moisture rich surfaces such as sinks or tubs.

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References

  • Photo Credit Jupiterimages/Comstock/Getty Images
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