Tile Installation Questions, Answered Honestly

The substrate has to be flat, solid, and dry. For floors, we check for flex by walking the area and pressing on sections with our foot. Any movement means the subfloor needs attention before tile goes down. Tile set over a bouncy or soft subfloor will crack along the grout lines within months. We assess this during the on-site estimate and let you know what, if anything, needs to be corrected first.

Both are fired clay products, but porcelain is made from denser clay and fired at higher temperatures. The result is a tile with water absorption below 0.5%, compared to ceramic which can absorb up to 3% or more. Porcelain is harder, less porous, and better suited for high-moisture or high-traffic areas. Ceramic is typically easier to cut and works well for walls and lower-traffic floors. The right choice depends on the specific room and how the space is used.

Yes. A standard overage of 10% is typical for straight-lay patterns. Diagonal or herringbone layouts waste more material at the cuts and often require 15% extra. Buying from the same production run matters because tile color can vary slightly between batches. We calculate the exact quantity needed during the estimate and include the recommended overage in that figure.

Thinset mortar needs to cure before grout can be applied. Depending on the product and ambient temperature, this typically takes 24 hours. Rushing grout application over uncured thinset can cause tiles to shift and grout to crack. For wet areas like showers, a waterproofing membrane is applied before tile goes up, and that layer also needs cure time. The multi-day schedule is not padding, it is how the materials work.

Sometimes. The existing tile has to be firmly bonded, flat, and not showing signs of moisture damage underneath. Tiling over existing tile raises the floor height, which can create transition issues at doorways and may affect toilet flange height in bathrooms. We evaluate the condition of the existing surface during the estimate and give a straightforward recommendation on whether removal is necessary.

Back-buttering means applying a thin coat of thinset directly to the back of the tile before setting it, in addition to the thinset already on the substrate. It is required for large-format tiles (generally 15 inches and larger), natural stone, and tiles with deep relief on the back face. The goal is full coverage, meaning at least 95% of the tile back is in contact with mortar in wet areas. Voids under tile in a shower can trap moisture and lead to failure over time.

Cement-based grout is porous and will absorb stains without a sealer. Epoxy grout is non-porous and does not require sealing. For most residential applications with cement grout, we recommend applying a penetrating grout sealer after the grout has fully cured, which takes about 72 hours. In kitchens and bathrooms, resealing every year or two is a reasonable maintenance step. We discuss this during the final walkthrough.

Light foot traffic is generally safe 24 hours after the thinset has cured, but we recommend waiting until after grout is applied and cured before putting the floor through normal use. For showers, we suggest waiting a full 72 hours after grout application before running water. The grout needs time to reach its full hardness, and early exposure to moisture can affect the final cure and color consistency.

Cracked grout usually traces back to one of four causes: movement in the substrate below, insufficient thinset coverage under the tile, grout applied before the thinset was fully cured, or missing expansion joints at walls and transitions. A crack in a single grout line near a wall is often just a missing caulk joint, which is normal and easy to address. Widespread cracking across the field typically points to a substrate issue. If you notice cracking, give us a call and describe where it is occurring.