How to Apply Grout to Limestone Wall Tile

Written by sarabeth asaff
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How to Apply Grout to Limestone Wall Tile
Protect limestone wall tile with an impregnating sealer before applying grout. (Jupiterimages/Comstock/Getty Images)

Limestone is a soft, sedimentary stone that can be formed in many kinds of tile suitable for wall use. Large polished tiles, small tumbled tiles or rustic Jerusalem wall stone can all be formed from limestone. No matter what shape or style the limestone tiles are, they should all be grouted to help protect the edges of the tiles from wear due to house settling. Like any natural stone, limestone should be sealed prior to grouting and the type of grout is dependent on the style of stone.

Skill level:
Moderately Easy

Things you need

  • Impregnating sealer for very porous stone
  • Paint brush
  • Soft cloth
  • Unsanded grout for polished or honed limestone tiles
  • Sanded grout for tumbled limestone or Jerusalem wall stone tiles
  • Bucket
  • Water
  • Hand trowel
  • Grout float
  • Sponge

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  1. 1

    Paint the limestone with an impregnating sealer specifically made for very porous stone. Limestone is soft enough to absorb the grout and stain if not protected before hand. Use a paint brush with overlapping strokes to saturate the stone. Wait 10 minutes and polish the limestone with a soft cloth to remove any excess.

  2. 2

    Mix the grout in a large bucket. Add the grout first and the water a little at a time, mixing continuously with a hand trowel. Stop adding water when the grout is the consistency of peanut butter.

  3. 3

    Scoop up a small amount of grout with the rubber grouting tool or float. Hold the float so the edge comes in contact with the limestone, and drag the grout across the tiles. Move the float from all angles, up and down, side to side and diagonally to make sure all areas of the stone are covered. Pay particular attention to rustic limestone; the uneven edges or broken corners will require extra grout to fill them.

  4. 4

    Scrape excess grout off of the surface of the limestone with the side of the grout float. Use a slightly dampened sponge to clean away the excess grout from the tiles. Make multiple passes with the sponge, particularly on rustic tiles or Jerusalem wall stone which have multiple crevices for grout to collect in. The grout will harden overnight, and will be completely cured within three weeks.

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