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How To Install Marble Threshold [Step-By-Step Guide]

A marble threshold is a great choice for any doorway. It’ll give your home a royal look. However, building one can be challenging indeed. This is why we’ve put together this guide to help you avoid problems.

What do you need to do while installing marble threshold?

At first, you’ll need to clean up the work area. Then, you should test if the floor is stable enough. After that, you should measure the size of the marble. The next step is cutting the marble according to your requirement. Then apply mortar to the area you’re going to install marble. Finally, place the marble for installation. 

This is just a summary. You’ll need in-depth knowledge in order to apply the steps properly. Read along to find out!

Let’s get started, then!

Installing Marble Threshold: In Just 8 Steps

Marble thresholds look fantastic. They’re reasonably priced and smooth to the touch as well.  You won’t need the help of a professional to install one. A few tools are needed to accomplish this. Let’s take a look at what you’ll require-

Tools You’ll Need

Please cross-check these tools and make sure you have all of them-

  • Marble Threshold
  • Buffing Compound
  • Tile Wet Saw
  • Notched Trowel
  • Chalk & Putty Knife
  • Broom & Vacuum
  • Polishing Wheel
  • Granite Thinset
  • Helper
  • Level
  • Tape Measure

Now that you’ve all you need, it’s time to start installing. Let’s proceed to the steps. 

Step 1: Preparing The Work Area

The first step in installing the marble threshold is preparing the work area. You can do that by cleaning it. 

Start by grabbing a broom and sweep the area thoroughly. After that, it’d be a good idea to vacuum up the place. Consequently, all the dust and debris will be removed.

A clean surface will ensure that nothing gets in the way when installing a threshold.

Step 2: Testing Floor’s Stability

After the floor is dust-free, you’ll need to make sure it’s level or not. 

To test the floor’s stability, a helper is needed. Begin by bouncing it on its heels on the opposite side of the room. 

If the floor is vibrating only a little, it’s safe for threshold installation. However, if there is a lot of vibration, the floor will flex and crack the grout. Additionally, a tile could also crack as well.

If the floor lacks stability, there are a few things you can do. One of the methods is attaching a floor joist underneath the floor. For further stabilization, you could add jack supports as well. On that note, here are our recommendations for the two best jack supports- 

Product 1Product 2

These jack supports should do a wonderful job. Now let’s carry on with the process!

Step 3: Leveling The Floor

You now know your floor is stable enough, it’s now time to level it.

First, grab the biggest level you can find and check the floor. Search for any gaps between the level and the floor. If you find some, apply floor leveling compound to level the floor. 

Lastly, check if the floor slope is no more than 1/16” for every 3’. 

Step 4: Measuring The Area

You should now measure the areas of your house where the threshold will be installed. You should first measure the height and the width. 

To determine the height, run a tape measure from the top to the bottom corner. And, to determine the width, measure from the left to the right corner of the door

Finally, add 1/4 inch to this figure. In this way, you’ll get a 1/8-inch joint on both sides of the door. This’ll allow for expansion and contraction of the materials during weather changes. 

Proper measurements will ensure that you prevent the issue of water beneath floor tiles. This is because there will be insufficient space for the water to seep into.

Step 5: Measuring The Marble

Marble is expensive, so it’s better that you don’t waste any. Therefore, it’s crucial that you measure it properly. 

First, determine the best location for the marble piece for the threshold. And then lay it out there. 

Next, make a mark on the marble where the threshold makes contact with the doorway. Use a pencil to do this. 

Most marble thresholds are 2 to 4 inches wide and 30 to 36 inches long. So, take out the tape measure and measure if the marble is matching these diameters. If the size of the marble is different from this, you might accidentally crack it. 

Step 6: Cutting The Marble

We’ve reached a very crucial step in this guide. You’ll need to cut the marble now in order to place it on the threshold.

You should have a tile-wet saw at your disposal for cutting the marble. However, before cutting, ensure there’s sufficient water in the holder beneath the saw blade.

Then, carefully place your marble threshold piece in place. Check that the blade is aligned with the mark you created with your measurements.

Go ahead and start cutting the marble now. When cutting the marble, don’t use much force. Simply insert the blade and cautiously pull it along. As long as you follow through the cut line in the marble, you’ll be fine. In addition,  it’s imperative that you don’t chip marble tile while cutting. So, ascertain that doesn’t happen.

After cutting, use a power sander to sand the edges. Begin with coarse 80-grit sandpaper and work your way up to extra-fine 400 grit. Then, using a polishing wheel and buffing compound, polish the edges.

Finally, after you cut the marble, it’ll be wet. It’ll need to dry before being installed in your threshold. Hence, please give it some time to dry.

Step: 7 Applying Granite Mortar

In order to install the marble, you’ll need to apply granite mortar first.

Apply granite mortar to the area’s surface with a notched trowel. Next, check if the notches are even.

Next, place the tiles on the mortar and space them. After that, apply mortar to the backs of the tiles to ensure a strong bond. 

It’s crucial that you ensure that the grout doesn’t crack. Place mesh mortar tape directly on top of the mortar when applying it across gaps. This’ll prevent the issue.

Lastly, while installing the threshold,  you don’t need to seal marble tile prior to grouting.

Step 8: Placing Marble Threshold

At last, we’ve reached the final step. After doing all the work, it’s now finally time to put the marble threshold in place.

First, place the marble threshold onto the mortar with care. Next, apply some light pressure to the threshold as the bond begins to form. Handle this by slightly sliding it in different directions.

Next, make sure that the threshold is properly aligned before pushing it all the way down. Once you’re satisfied with the placement, try to keep the area as low traffic as possible. Please do this until the bond is completely sealed and the mortar has dried. 

Please be patient as this entire process can take up to 24 to 72 hours. Above all, you don’t want the marble threshold to fall off. This almost certainly necessitates the purchase of a new one.

Congratulations! You’ve now successfully installed a marble threshold all on your own!


Question: Should I grout between the tile and the marble threshold?

Answer: Yes.  Start by forcing the grout into the grout lines between the marble tiles. Use a rubber float for this. After that, hold the float at a 47 degree angle to the lines. Try to force as much grout between the tiles as possible. Finally, remove excess grout from the tile surface with a damp sponge.

Question: What is the cost of a marble?

Answer: Marble thresholds typically range in length from 30 to 36 inches. And the cost of marble is between $20 and $50 per piece. The caulk will set you back about $28. Additionally, there are a lot of variables. Your entire cost will depend on the materials and the finishing style you’re choosing.

Question: How many different styles do marble thresholds come in?

Answer: Marble thresholds are typically available in two styles. These are standard bevel and Hollywood bevel. The standard is a flat marble slab with two long sides that are slightly beveled. The Hollywood bevel, on the other hand, is slightly raised, similar to a rooftop


And this information should be enough for you while installing marble threshold

Does the job seem easy after going through our guide? Remember to take safety precautions because you’ll be dealing with sharp tools. 

We look forward to seeing you again soon. Take care and stay safe until then!