What Goes Under a Crushed Limestone Tile Floor?

What Goes Under a Crushed Limestone Tile Floor? thumbnail
Find out what to place under crushed limestone tile flooring.

Limestone flooring provides an elegant flooring type that is softer than granite. Crushed limestone can be made into tile in a composite form. This composite is versatile and can be used in combination with a variety of subfloors. Wood, concrete, cement backer board and specially designed underlayments can be placed under the limestone flooring to provide a base for the crushed limestone tiles to adhere to.

  1. General Information

    • Crushed limestone in tile form is a composite material with a fortification of polymeric resin. It often looks like ceramic tile, but is much more durable and won't chip like ceramic tile. A variety of subfloors can be used in conjunction with crushed limestone. It also requires a special adhesive to get it to stick to the subfloor.


    • Concrete can be used as a subfloor, assuming it meets the criteria, including a clean surface devoid of any sealants, adhesive residue and paint. The floor should also be cleaned before installation. Any gaps larger than one-eighth inch should be filled before installing crushed limestone tiles.


    • Wood floors can provide a subflooring below crushed limestone tiles. Leave 18 inches of air space below the wood subfloors. The wood must be in good condition and solid. The subfloor should be at least 1 inch thick. An underlayment can be added to the wood floors to provide for the necessary thickness. Any gaps greater than 1/32 of an inch should be filled with a patching compound.

    Cement Backer Board

    • Cement backer board can be used to provide a subflooring for crushed limestone tiles if you have an existing tile or vinyl flooring. Use 3/4-inch thick cement backer board. Apply thin-set mortar to the existing flooring and spread it around with a trowel. Cover an area large enough for one sheet of backer board. Drill screws every 8 to 10 inches into the backer board until they are below the surface of the backer board.

    Underlayment System

    • An underlayment system can be used to create a floating installation. This material can be used if you have an inadequate flooring, such as a wood floor that has rough patches or a concrete floor with paint or residue. Roll out the sheet of underlayment and leave 1/4-inch around the room's perimeter. Tape multiple sheets together at the seams.


    • Purchase adhesive from the manufacturer where you bought the crushed limestone tiles. Spread the adhesive with a trowel onto the subfloor. It will change color to a clear color as it becomes tacky. This will indicate it is time to install the tile.


    • You can install the tile with or without grout lines. Without the grout lines, install one tile at a time with each tile being flush against the previous tile. If you choose to add grout lines to replicate a traditional tile installation, add spacers between each tile. After all of the tiles are laid, rub grout over the entire flooring. Do not use mortar under the tiles.

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