How to Choose the Right Mortar for Your Tile Installation

Written By Trevor Gallant

When it comes to a lasting tile installation, choosing the right mortar is just as important as the tile itself. Ensuring that you have chosen the right type of mortar to use can literally make or break the job. Here’s a quick guide to help homeowners understand what goes into selecting the right mortar for every project.

1. Consider the Type of Tile

Not all tiles are created equal, and neither are mortars.

  • Ceramic tile: Standard, unmodified thinset works well since ceramic is porous and bonds easily.

  • Porcelain tile: Because porcelain is denser and less porous, it needs a modified thinset (with added polymers for better adhesion).

  • Natural stone (like marble or slate): Requires a white mortar to prevent discoloration and a formula designed for heavier tiles.

💡to consider: If you’re installing large format tiles (LFT), look for a “large tile” mortar to prevent sag when installing and maximum hold.

2. Don’t Forget the Substrate

Before you spread that first bed of mortar, consider what is underneath the tiles.

  • Concrete or cement board: Most thinsets bond well.

  • Plywood subfloor: Needs a latex-modified mortar or underlayment for proper adhesion.

  • Heated floors: Choose a flexible, polymer-modified mortar designed to handle expansion and contraction.

3. Take Note of the Pot Life

Mortars set at different speeds. Some stay workable longer (“extended open time”), which helps on big or complex jobs. Some set rapidly (rapid set), which helps in applications that require a quick turn-around. Always read the manufacturer’s directions — and mix only what you can apply within 30–40 minutes.

4. When in Doubt - Ask Your Installer

If you’re not sure what to use, ask a professional tile installer. The right mortar depends on tile type, subfloor, room conditions, and even tile color. Using the wrong product can lead to loose tiles, cracking, or moisture problems down the road.

✅ To Wrap it Up

A great tile job starts long before the first tile is set — it starts with proper prep and the right materials. Whether you’re redoing a kitchen backsplash or tiling a sunroom, choosing the right mortar ensures your new surface stays beautiful and strong for years.

📞 Need professional tile installation in Barrie?
Contact Gallant Stone & Tile today for expert advice and a free estimate on your next project!

Trevor Gallant