If you have installed ceramic or porcelain tile—or any other kind of natural stone tile—the techniques for installing marble tiles will be familiar to you. Much of the process is nearly the same:

  • Subfloor preparation is similar—cement board underlayment installed over a sturdy plywood subfloor is the best base for marble tiles, just as it is with ceramic tile. 
  • Tiles are “glued” down with a thin-set adhesive—a mortar-based product that now is the standard for ceramic and stone tile products. 
  • Joints between tiles are grouted with a fine mortar product, with or without sand additives. 
  • Sealing is required (but must be a special marble sealer).
  • Most installation tools are identical to those used to install ceramic and porcelain tile. 

There are also some very key differences, though, based on the unique properties of marble tiles:

  • Marble tiles are quite thick, so laying the tiles over the top of the existing floor is rarely practical. Installing marble tile usually requires demolition and removal of the existing floor covering. By contrast, ceramic tile can sometimes be installed over the top of vinyl flooring or old ceramic tile.
  • Because marble is very heavy when compared to ceramic products, it is critical that the subfloor is very sturdy. This may require some structural work to reinforce the joists supporting the subfloor.
  • Marble tiles are thick and hard, and cannot be cut with a snap cutter, which is commonly used for cutting ceramic tile. Only a motorized wet saw will work for marble tile. Holes in marble tile must be cut with special hole saws with diamond blades. 
  • Unlike ceramics, which have an impervious, glazed surface, marble is a porous stone that must be sealed before it is grouted to prevent staining. And the entire surface must be resealed periodically to keep the surface looking good. Unlike glazed ceramic tile, sealing must be done to the entire surface of marble tiles. 

Tools and Materials Needed

  • Marble tile
  • Thinset mortar (tile adhesive)
  • 1/4-inch notched trowel
  • Cement board sheets
  • 1 1/4-inch  cement board screws
  • Drill/driver
  • Cement board joint tape
  • 6-inch drywall knife
  • Tape measure
  • Chalk line
  • Pencil
  • T-square
  • Tile spacers
  • Straight 2 x 4 board
  • Rubber mallet
  • Wet saw (or custom-cut tile pieces)
  • Diamond-tipped holes saws (if needed)
  • Utility knife
  • Marble tile-and-grout sealer
  • Foam brush
  • Work gloves
  • Grout
  • Grout float
  • Grout sponge
  • 02of 14

    Prepare the Subfloor

    installing cementboard with screws


    Marble floor tile (like all floor tile) requires a smooth, flat, water-resistant base for installation. In most cases, this will require removing the existing floor covering down to the subfloor layer, which is usually plywood or MDF. 

    Once you have exposed the wood subfloor, cover it with a layer of cement board to add both stiffness and moisture-resistance to the floor. Cement board doesn’t stop moisture from passing through it—it’s not a vapor or moisture barrier—but it won’t be damaged by moisture as wood is. Cement board also is engineered to bond very well with thin-set mortar adhesive, which you will use to install your marble tile. 

    To install cement board, spread thin-set adhesive over the wood subfloor, using a 1/4-inch notched trowel. Lay the cement board sheets into the thin-set and fasten them to the subflooring with 1 1/4-inch cement board screws. Leave about 1/8 inch of space at all seams and where the cement board meets the walls. 

    Apply cement board joint tape (a special alkali-resistant mesh tape) over the seams between the cement board panels, then cover the tape with a thin layer of thin-set, using a 6-inch drywall knife. Make sure the seams are smooth and flat and flush with the panel faces. 

  • 03of 14

    Create Reference Lines

    Marking reference lines


    Your installation will look best if the tiles radiate outward from the center of the room, rather than starting abruptly from one of the walls. In order to achieve this symmetrical effect, you need to create reference lines on the surface of the cement board underlayment.

    Find the center of two opposing walls and use a chalk line to mark a path between them, dividing the room in half. 

    Then, measure to the center of that line, and use a T-square to draw a perpendicular line at the mark, using a pencil. Snap a chalk line across the floor using the pencil line as a guide, dividing the floor into four equal quadrants.

    Check your layout by test-fitting full tiles along both reference lines from wall to wall. If the last row of tiles against any of the walls is less than a few inches wide, adjust your chalk line grid as needed so that the tiles along the walls are an acceptable width, based on your preference. This usually means that a tile, rather than a grout line, will be at the very center of the floor, but there’s really no drawback to this. 

  • 04of 14

    Mix and Spread the Mortar

    Applying thinset with a notched trowel


    Mix thin-set mortar according to the manufacturer’s instructions. Mix only a little bit at a time, and make more when necessary. Using a notched trowel, spread the adhesive onto the floor, starting at a corner of the layout where the reference lines intersect at the center of the room.

    As you work, use the notched edge of the trowel to create grooves in the mortar. This will increase the adhesive strength of the bond between the cement board and the bottom of the marble.

    Note: On marble tiles that are 12 inches square and smaller, a 1/4-inch  notched trowel will create large enough grooves. However, if you have much larger tiles, or if you are using irregular tumbled or natural cleft materials, use a 1/2-inch notched trowel to create wider, deeper grooves in the adhesive.

  • 05of 14

    Set the First Tile

    Setting a marble tile


    Spread enough mortar to easily cover the bottom of a single tile, and make sure that its entire surface is notched. Gently press the first tile into place, aligning two of its edges with the chalk lines in the corner of the layout. As you press it down, twist the tile slightly to ensure that it properly sets in the mortar bed below.

  • 06of 14

    “Set” the Tile With a Rubber Mallet

    Tapping tile with a rubber mallet


    A rubber mallet is a large hammer with a soft rubber head. Use this to lightly tap the surface of the marble tile, pressing it more firmly into the mortar. However, be careful not to tap too hard, as marble is a relatively soft material and can crack rather easily. You also want to avoid moving the tile as you are setting it.

  • 07of 14

    Install Additional Tiles

    Marble tile spacers


    Continue to spread mortar for each tile, then place the tile before moving on to the next one. Follow the reference line towards the wall, using it as a guide to keeping your placement straight. Use tile spacers to maintain consistent spacing between tiles. The spacers should be selected for whatever width you have chosen for the joints. Spacers help ensure the grout lines are sharp and uniform.

    Tip: There are two ways the X-shaped spaces can be used. You can insert them flat at the intersection between tiles (as shown here), but this can make it difficult to remove them before you grout. Or, you can insert them upright in the spaces between the tiles. This requires a bit more care to ensure the tiles remain square to one another, but it will make it much easier to remove them after the tiles are set and before grouting. If you install the spacers flat, under no circumstances should you grout over them. 

  • 08of 14

    Install the Remaining Full-Size Tiles

    Making sure tile heights are even


    After placing every three or four tiles, use a 2 x 4 to ensure that they are at a uniform height. Place the board across the tiles, and tap the board lightly with the rubber mallet. If the marble is polished you may want to cover the front of the wood with a piece of carpet to prevent scratches. You can also do this across multiple rows when you have more tiles installed.

    Once you reach the wall with the first row, take note of the gap at the end that may require a custom-cut piece. Then, move back to the center point of the reference lines, and continue to place tiles adjacent to the first row. Take a moment after every few tiles to ensure that all of your lines meet up and the entire floor looks sharp and consistent.

    As you work, be careful not to step on any installed tiles. Typically, marble floor tile should be allowed to set for at least 48 hours after installation. Because of this, you have to be careful not to tile yourself into a corner that you can not escape from. Be sure to leave a traffic path for yourself; the last quadrant you work on should be the one where the door is located. 

  • 09of 14

    Cut Tiles With a Wet Saw

    Commercial wet saw


    Use a tile wet saw to cut tiles as needed. You can buy a small wet saw for under $100 dollars, but most DIYers simply rent them by the day. Smaller, portable saws are able to handle basic straight cuts on tiles up to 12 inches. Rental charges may include a flat fee for the saw plus a prorated charge for wear on the diamond blade. 

    A wet saw works by spraying water on the material, as you run it through a spinning saw blade. The water helps to keep the blade cool and the cuts smooth as it moves through the marble. Because marble is delicate and easy to crack, move very slowly as you cut each piece. For difficult cuts, or if you prefer not to use a saw, ask your tile supplier if they will cut pieces for you.

    If you need to cut holes in marble tile, such as may be necessary if you have plumbing pipes coming up through the floor, special hole saws with diamond-encrusted cutting edges can be used. The hole saws are simply mounted in a power drill. Make sure to cut at a slow speed to prevent overheating the hole saw. 

  • 10of 14

    Remove Excess Mortar

    cleaning mortar from grout line


    If you properly troweled the thin-set mortar adhesive, the setting of the tile will collapse the ridges but not cause the excess adhesive to ooze up between the tiles. If you set the tiles with too much force, now is the time to remove any excess adhesive from the gaps between tiles, using a paint stick or utility knife. It is important that there be enough space between tiles for the grout to properly bond. 

    When all tile has been installed, let the mortar adhesive dry completely, following the manufacturer’s directions. Do not walk on the floor during this time, or you risk moving or depressing a tile.

  • 11of 14

    Seal the Marble

    sealing marble tiles


    Marble may seem like it is a very hard, solid material. It is rock, after all. But in actuality, marble is a very delicate flooring material that needs to be treated carefully. Not only is it prone to cracking and chipping, but it is also very porous, and many materials can penetrate the surface of the stone, causing permanent stains. For this reason, it must be sealed with a high-quality marble tile sealant before you grout. Grout can badly stain marble tile if it is applied before the marble is sealed. 

    If you have polished marble, apply a very thin coat of sealant. Use the foam brush to smooth out any puddles or tiny bubbles that appear on the surface, as they can dry into permanent features. The surface of tumbled and honed marble will be more forgiving, but the same rules apply there, as well.

  • 12of 14

    Grout the Tile

    applying grout with a grout float


    Mix the grout as directed by the manufacturer. As with ceramic tile, use unsanded grout if the joints are 1/8-inch wide or less; used sanded grout for wider joints. As with the mortar, mix only as much as you can apply in about 15 or 20 minutes—the point where the grout starts to set up.

    Use a grout float to apply the grout to the joints, using a sweeping motion to force it down into the joints. Holding the tool slightly on edge can help push the grout downward. Try to direct as much of the mix into the grooves as possible, and wipe up any excess that gets on the tiles. Ideally, the seams between tiles must be fully packed with grout, without void areas. 

  • 13of 14

    Wipe the Tiles Clean

    cleaning tile with a grout sponge


    Use a large grout sponge that is slightly damp to gently wipe the surface of the marble tiles clean and remove excess grout. Be careful not to allow any moisture to seep down into the grout lines, as this can cause the mix to become muddy and wash out. Also, try ​to avoid inadvertently pulling the grout out of the joints as you work with the sponge—focus your efforts on the surface of the tiles only. 

    Allow the grout to cure as directed. 

  • 14of 14

    Seal the Grout

    sealing grout


    Check the grout manufacturer’s recommended waiting time before sealing the grout. Waiting for 7 days is not uncommon. Seal the grout with a foam brush, following the manufacturer’s directions for application.

    It’s generally a good idea to seal a marble tile at least twice—and perhaps several times—waiting for each coat to dry before applying a new one. This creates a strong protective layer on the surface of the material. You may need to reseal the tile every 6 to 12 months, depending on how much traffic the room gets.


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