Why Is My New Tile Cracked? A Guide to Proper Tile Installation

There’s nothing more disappointing than finishing a beautiful tile installation, only to notice a crack a few weeks later, or to feel an unsettling crunch underfoot. Tiling might look straightforward, but it’s a craft built on a foundation of precise preparation and technique. Most tile failures aren't the tile's fault—they're the result of installation errors.

Let's walk through the most common tiling mistakes and how to ensure your project is done right.

Mistake #1: Ignoring the Subfloor

The Problem: Tiles installed over an uneven, flexible, or improperly prepared subfloor. The Cause: Tiles and mortar are rigid. Any movement or dip in the subfloor will transfer stress directly to the tile, causing cracks. Wood subfloors especially can have too much flex. How to Do It Right:

• Check for Level & Flex: Use a long level to check for dips and valleys. Ensure the floor doesn't flex or bounce when you walk on it.
• Use the Right Underlayment: For wood subfloors, cement backer board is essential to create a stable, rigid surface. For uneven concrete, a self-leveling compound may be needed.

Mistake #2: Using the Wrong Mortar

The Problem: Tiles not adhering properly or debonding over time. The Cause: Using a pre-mixed "mastic" adhesive in wet areas (showers) or for large-format tiles, or using the wrong type of thinset mortar. How to Do It Right:

• Choose Thinset Mortar: Always use a powder-based thinset mortar that you mix with water or a latex additive.
• Read the Bag: Select a mortar designed for your specific application: a modified mortar for showers, a large-format mortar for big tiles, and a non-sag mortar for walls.

Mistake #3: Incorrect Trowel Technique

The Problem: Inadequate coverage on the back of the tile, leading to hollow spots and potential cracks. The Cause: Not using a large enough trowel or applying the mortar incorrectly. How to Do It Right:

• Trowel Size Matters: Use a trowel recommended by the tile manufacturer (e.g., a 1/2" x 1/2" square notch for large tiles).
• Key In: Spread mortar on the substrate, then "key" a thin layer into the back of the tile as well.
• Burn It In: Press the tile firmly into place with a slight twisting motion to ensure full, even coverage without air pockets.

Mistake #4: Inconsistent Grout Lines

The Problem: Grout lines that vary in width, making the entire installation look amateurish. The Cause: Not using tile spacers or using mismatched, low-quality spacers. How to Do It Right:

• Use Spacers: Invest in high-quality, uniform tile spacers. For rectified tiles, use tiny "wedge" spacers to ensure perfect spacing.
• Check as You Go: Constantly use a level across multiple tiles to check for "lippage" (uneven edges) and adjust before the mortar sets.

Mistake #5: Rushing the Grouting Process

The Problem: Discolored, cracked, or pitted grout. The Cause: Adding too much water when mixing grout, grouting before the mortar is fully cured, or not sealing the grout afterward. How to Do It Right:

• Follow Time Instructions: Wait a full 24-48 hours after setting tile before grouting.
• Mix Properly: Follow the water-to-powder ratio exactly for a consistent, paste-like texture.
• Seal It: After the grout has fully cured (about 72 hours), apply a quality grout sealer, especially in wet areas, to prevent staining and water damage.

Why Hire a Professional Tile Setter?

A tile installation is only as good as the surface it's on and the hands that install it. While a DIY backsplash is a great starter project, floors, showers, and large areas demand a professional. Hiring a pro from Part of Art ensures:

• Expert Assessment: We identify and solve subfloor issues you might not even see.
• The Right Materials: We use industry-grade mortars, membranes, and tools for a lasting install.
• Craftsmanship & Efficiency: We deliver a flawless, level, and beautiful finish quickly and cleanly, with a warranty on our work.
• Problem Prevention: We handle the nuances of waterproofing, expansion joints, and layout planning to avoid costly failures down the road.

Don't gamble on one of the most permanent features of your home. Get a free consultation and quote from our expert team to ensure your tile project is perfect from the ground up.