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Grouting Marble Tiles: A Pro’s Guide with a Grout Float

Grouting marble tiles can seem like a daunting task, but fear not! With the right tools and a little know-how, you can achieve a flawless finish that will make your marble tiles shine. We’ll walk you through the steps of grouting marble tiles, with a special focus on using a grout float for a professional result.

Understanding Marble Tiles

Before we dive into the grouting process, let’s take a moment to appreciate the beauty and uniqueness of marble tiles. Marble is a natural stone known for its elegance and timeless appeal. It comes in various colors and patterns, making it a popular choice for both residential and commercial spaces. However, its porous nature means it requires special care during the grouting process.

Choosing the Right Grout

Selecting the appropriate grout is crucial when working with marble tiles. Non-sanded grout is the preferred choice, as it won’t scratch the delicate surface of the marble. It’s available in various colors to complement your tile design.

Selecting the appropriate grout for your marble tile project is a critical decision that can significantly impact the final outcome. The wrong choice can lead to unsightly blemishes, staining, and even damage to your precious marble. To ensure a successful grouting process, let’s delve deeper into grout and explore why non-sanded grout is the preferred choice for marble tiles.

Non-Sanded Grout

Non-sanded grout, also known as unsanded grout, is the go-to choice for grouting marble tiles. It offers several advantages over sanded grout, making it the ideal option for preserving the beauty of your marble surfaces.

Why Non-Sanded Grout?

  1. Gentle on Marble: Marble is a relatively soft stone that can be susceptible to scratches and abrasions. Non-sanded grout, composed of finely ground cement, is less likely to scratch the marble’s surface during application and cleaning.
  2. Narrow Gaps: Marble tiles are often closely spaced, leaving thin gaps between them. Non-sanded grout is designed for joints less than 1/8 inch wide, making it perfect for these delicate gaps without causing damage or staining.
  3. Stain Resistance: Marble is susceptible to staining, and using sanded grout can introduce abrasive particles that increase the risk of staining. Non-sanded grout minimizes this risk, helping your marble tiles maintain their pristine appearance.

Color Options

Non-sanded grout is available in a wide range of colors, allowing you to complement your marble tiles and design aesthetic seamlessly. If you’re aiming for a classic, monochromatic look or something more daring and contrasting, you can find a non-sanded grout color that suits your vision.

Examples of Non-Sanded Grout Types

1. Mapei Keracolor U

This premium non-sanded grout offers excellent stain resistance and color consistency. It’s available in an extensive color palette, ensuring you can find the perfect shade for your marble tiles. Mapei Keracolor U is known for its ease of application and long-lasting durability, making it a top choice for professionals.

2. Custom Building Products Polyblend Non-Sanded Grout

Custom Building Products offers a versatile non-sanded grout option that’s easy to work with and delivers consistent results. With a variety of colors to choose from, you can achieve the precise look you desire for your marble tile project.

3. Laticrete PermaColor Select

Laticrete’s PermaColor Select non-sanded grout is known for its high-performance formula, providing superior stain resistance and color accuracy. This grout also offers FastCure™ technology, allowing for rapid curing without compromising quality.

Factors to Consider When Choosing Non-Sanded Grout

While non-sanded grout is the preferred choice for marble tiles, there are still factors to consider when making your selection:

  • Tile Spacing: Ensure that the grout you choose is suitable for the width of the gaps between your marble tiles. Non-sanded grout is best for narrow joints, typically less than 1/8 inch wide.
  • Color Matching: Take the time to compare grout color samples with your marble tiles in different lighting conditions to find the perfect match.
  • Sealer Compatibility: Some non-sanded grouts come with built-in sealers, while others may require a separate sealing step. Be sure to check the manufacturer’s recommendations and follow them accordingly.
  • Application Temperature and Humidity: Pay attention to the manufacturer’s guidelines regarding temperature and humidity conditions during grout application. These factors can affect the curing process.

Choosing the right grout is a crucial step in ensuring the longevity and beauty of your marble tile project. With non-sanded grout, you can confidently enhance the natural elegance of your marble while minimizing the risk of damage or staining. So, when grouting marble tiles, know that the choice of non-sanded grout is not just about aesthetics; it’s about preserving the timeless allure of your marble surfaces.

Essential Tools for Grouting

To achieve professional results when grouting marble tiles, you’ll need a few essential tools:

Grout Float

A grout float is a rubber or foam tool used to spread and press grout into the gaps between tiles. Its large, flat surface ensures even distribution and minimizes the risk of scratching the marble surface.

Bucket and Sponge

You’ll need a bucket of clean water and a sponge for wiping away excess grout and keeping your tiles clean during the process.

Rubber Gloves and Eye Protection

Safety first! Wear rubber gloves and eye protection to prevent skin irritation and eye contact with grout materials.

Preparing the Marble Tiles

Before you start grouting, ensure that your marble tiles are firmly in place, with any adhesive fully dried. Here’s what to do:

Step 1: Clean the Tile Surface

Use a damp cloth or sponge to wipe away any dust or debris from the tile surface. This step ensures that the grout adheres properly.

Step 2: Apply a Sealer

To protect the marble from grout stains, consider applying a sealer to the tiles. Follow the manufacturer’s instructions for the best results.

Mixing and Applying Grout

Now, let’s get into the heart of the grouting process:

Step 3: Mix the Grout

Follow the grout manufacturer’s instructions to mix the grout to the right consistency. Typically, you’ll want a thick but workable texture.

Step 4: Using the Grout Float

Here’s where the grout float becomes your best friend:

Start in a corner

Begin in a corner of the tiled area and hold the grout float at a 45-degree angle.

Apply the grout

Spread the grout diagonally across the tiles, ensuring that it fills all the gaps. Use the edge of the grout float to press the grout into the crevices.

Clean as you go

Wipe away excess grout from the tile surface with a damp sponge. Rinse the sponge frequently to keep it clean.

Step 5: Cure the Grout

Allow the grout to set for the time recommended by the manufacturer, typically around 15-30 minutes. During this time, periodically wipe away any haze that forms on the tiles.

Polishing the Marble

Once the grout has set, it’s time to bring out the natural beauty of your marble tiles:

Step 6: Buffing

Using a clean, dry cloth or a buffing pad, gently buff the tiles to remove any remaining grout residue and achieve a shiny finish.

Step 7: Final Cleaning

Give your tiles a final wipe-down with a damp sponge to ensure no grout haze remains. This step is crucial to reveal the full brilliance of your marble tiles.


Grouting marble tiles with a grout float may seem challenging at first, but by following these steps and taking your time, you can achieve professional-quality results that showcase the elegance of your marble tiles. Don’t forget to choose the right grout, use the correct tools, and follow safety precautions. With practice, you’ll become a pro at grouting marble tiles, enhancing the beauty of your space for years to come. So, grab your grout float and get ready to transform your marble tiles into a work of art!

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