Tile Grout: Everything You Need to Know for a Perfect Installation in Your Bathroom

Samuel Provencher
Feb 21
3 min read

Tile grout is the discreet but indispensable element of a successful installation, with Bonbain Construction , your bathroom renovation partner in Montreal .

Although it may seem insignificant, the right grout can transform the look and functionality of your bathroom. From aesthetics to moisture protection, grout plays a key role in ensuring a durable and stylish tiled surface.

We explain everything you need to know about tile grout , including types, applications, maintenance and tips for making the right choice.

Tile joints play an aesthetic and technical role in your Montreal bathroom.

What is a tile joint and why is it important?

Tile grout is a mixture of cement, water, and additives used to fill the spaces between tiles. It serves several essential functions:

Structural strength

The grout holds the tiles in place, preventing them from shifting or cracking over time.

Water resistance

A properly applied and sealed joint prevents water from seeping under the tiles, thus protecting the bathroom from mold and moisture damage.

Aesthetic appearance

The grout lines enhance the overall appearance of the tiled surface, creating contrast or harmony, depending on your design choices.

The different types of seals and their uses

Sanded joint

Contains sand particles that provide strength and durability.
Ideal for: Joints of 3 mm or more (1/8 inch or more), such as tiled floors and high-traffic areas.

Unsanded joint

Smooth and free of sand particles, it is perfectly suited for narrow joints.
Ideal for: Joints less than 3 mm (1/8 inch or less), such as walls, mosaics and polished surfaces such as marble or glass.
Advantage: Modern technologies for non-sanded joints have significantly improved their durability and resistance to shrinkage, making them an excellent choice even in very humid areas.

Epoxy joint

Composed of epoxy resins, it offers excellent resistance to water and stains.
Ideal for: Highly humid areas such as showers, steam rooms and backsplashes. However, it is more expensive and requires technical application.

Cement-based joint

A traditional and economical option, but one that requires a sealant to resist stains and water.
Ideal for: Tiling projects in areas less exposed to moisture.

How to choose the right sealant for your bathroom

Take into account the tile material

For polished tiles such as marble or glass, use a non-sanded grout to avoid scratches.
For porous tiles such as natural stone, ensure that the grout is compatible and seal both the tiles and the joints.

Take into account the width of the joints

Wide joints require a sanded joint for increased strength, while narrow joints are better suited to an unsanded joint.

Choose a suitable color

For a harmonious look, match the grout color to the tiles. For a bolder effect, opt for a contrasting color.

Consider the humidity levels

In very humid areas such as showers, consider using an epoxy sealant for long-lasting performance.

Tips for successful sealant application

Prepare the surface

Ensure the tiles are clean and free of debris before applying the grout.

Use a jointing trowel

Spread the grout diagonally over the tiles, pressing firmly to fill the gaps.

Wipe away the excess sealant

Use a damp sponge to clean the tiles while leaving the grout lines well filled.

Seal the joint

Apply a sealant once the grout has hardened to protect it from stains and moisture. This step is especially important for cement-based grout.

Respect the drying time

Avoid exposing the area to water or heavy use until the sealant is completely dry (usually 24 to 72 hours, depending on the product).

Maintaining your tile joints

Regular cleaning

Use a mild cleaner and a soft brush to remove dirt and mold from the grout lines.

Reapply the sealant regularly

Apply a sealant every 1 to 2 years, depending on usage and humidity levels.

Repair the cracks quickly

Quickly repair any cracks or gaps in the joint to prevent water infiltration and damage.

Prevent stains

Wipe tiled surfaces regularly to prevent the accumulation of water and soap.

Costs of seals and what to expect

Material costs

Sanded or unsanded joint : $10 to $25 per bag (covers approximately 10 to 20 m²).
Epoxy grout : $50 to $120 per kit (covers approximately 5 to 10 m²).

Labor costs

Professional joint installation typically costs between $3 and $8 per square foot, depending on the complexity of the project.

Maintenance costs

Joint sealants cost between $10 and $40 per bottle, depending on the type and coverage.

Conclusion: Choosing and Maintaining the Right Sealant for Your Bathroom

Tile grout isn't just a simple filler—it's a key element that enhances both the functionality and aesthetics of your bathroom. Whether you're working on a shower, floor, or backsplash, choosing the right type of grout and maintaining it properly will ensure a durable and stylish tiled surface.

At BonBain Construction, we specialize in bathroom renovations and can help you choose and install the perfect sealant for your project.

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