Tile & Grout Repair in Calgary: When to Regrout and What It Costs

Grout vs. caulk: getting the right fix in the right place

The most common tile repair mistake is applying grout where caulk belongs, or caulk where grout belongs. The two materials serve different purposes and are not interchangeable:

• Grout — Rigid, cement-based filler. Goes between tiles on flat, stable surfaces: the field of a wall, a floor, a backsplash. Does not flex.
• Caulk — Flexible silicone or latex sealant. Goes at movement joints: the inside corners of a shower, the joint where the tub deck meets the wall, the base of a wall where it meets the floor. Must flex to accommodate the slight seasonal movement that occurs in any building.

The joint along the inside of a shower corner, or the line where the bathtub meets the wall tile, is a movement joint. Filling it with grout causes it to crack every season as the house moves — because the grout has no flexibility. Using silicone caulk in that joint and leaving it undisturbed is the correct, long-term solution.

When you look at a failed joint in a Calgary bathroom, the first question is: is this grout (between tiles on a flat surface) or caulk (at a corner or change of material)? That determines which repair is needed.

Why grout fails in Calgary homes

Insufficient removal depth when regrouted

The most common reason a previous repair did not last: the old grout was patched over rather than removed. New grout applied to the surface of old grout has no mechanical bond to the tile edge — it adheres only to the surface of the existing material and lifts as soon as there is any movement or moisture cycling. Proper regrouting requires removing the existing grout to 2 to 3mm depth with an oscillating tool before applying fresh material.

Unsealed grout absorbing moisture

Standard sanded and unsanded cement grout is porous. Without sealant applied after curing, grout absorbs moisture from shower steam with every use. Over time this leads to staining (mineral deposits from Calgary's moderately hard water), mould establishment in the wet porous surface, and accelerated degradation of the cement binder. Sealed grout repels surface moisture and is significantly easier to clean.

Substrate movement

Calgary's expansive clay soil causes seasonal foundation movement in older homes — particularly bungalows and bi-levels from the 1960s to 1980s. When the structure moves, tile and grout that is bonded rigidly to it cracks. Diagonal cracks through grout lines (rather than straight, predictable cracks along single joints) often indicate substrate movement. These are repaired with flexible grout in the affected joints rather than standard rigid grout, and the cause should be investigated if the cracking is widespread.

Missing or inadequate expansion joints

Large tiled areas — full bathroom floors, entire shower surrounds — should have an expansion joint (a caulked joint, not grouted) at intervals to accommodate thermal expansion. Older bathroom tile installations often lack these, causing grout to crack in a regular pattern across the tile field as temperatures cycle through Calgary's extreme range (-30°C to +35°C seasonally).

When to regrout vs. when to patch

Not every grout problem requires a full regrout. The right scope depends on how widespread the failure is:

What a professional regrout involves

1. Grout removal — Use an oscillating multi-tool with a grout removal blade to remove existing grout to a minimum depth of 2 to 3mm. This is the most labour-intensive step and the one most often skipped in DIY repairs.
2. Surface cleaning — Remove all dust and loose material from the joints. Clean any mould from the substrate with a mould-killing solution and allow to fully dry before applying new grout.
3. Grout selection — Match the grout type (sanded for joints over 3mm wide, unsanded for narrow joints and most wall tiles) and colour to the existing or desired finish. Epoxy grout is available for high-moisture areas and provides significantly better mould resistance.
4. Grout application — Force grout into joints with a rubber float, working in sections. Remove excess from tile surfaces before it sets.
5. Curing and sealing — Allow grout to cure for the manufacturer-specified period (typically 24 to 72 hours), then apply a penetrating grout sealant to reduce porosity and extend the repair life.

Tile and grout repair pricing in Calgary