What grout type is best for a kitchen backsplash that gets constant exposure to grease?

For a kitchen backsplash exposed to grease, epoxy grout is the gold standard, though properly sealed sanded cementitious grout is a solid, more affordable alternative. The key difference is that epoxy grout is inherently waterproof and stain-proof, meaning grease cannot penetrate it, while cementitious grout must be sealed to resist oil-based stains and can still absorb grease over time if the sealer wears away.

Epoxy grout is worth the premium cost in kitchens because it is stain-proof, never needs resealing, resists grease discoloration indefinitely, and is easier to keep clean long-term. The tradeoff is that epoxy is harder to work with during installation — it has a shorter working time, requires faster grouting technique, and is less forgiving if you make mistakes. A professional tile installer will have the skill and speed to apply epoxy efficiently. Epoxy also costs roughly 2 to 3 times more than cementitious grout, typically running $8 to $15 per square foot of grout labour in Ottawa, compared to $3 to $6 per square foot for standard sanded grout. For an average kitchen backsplash (30 to 50 square feet), that difference is roughly $150 to $450 in additional labour and material.

If you choose sanded cementitious grout — the more economical option — the critical step is sealing it properly and maintaining that seal. Kitchen backsplashes need high-quality grout sealer applied after the grout has fully cured (typically 72 hours), and that sealer should be reapplied annually to combat the relentless exposure to cooking oil, splatter, and steam. Many homeowners skip the annual resealing, which allows grease to gradually darken the grout and eventually stain it permanently. Over five to ten years, a sealed cementitious grout backsplash will eventually show some grease discoloration unless the sealing schedule is religiously maintained.

The joint width matters too. Sanded cementitious grout is appropriate for joints wider than 3 millimetres (one-eighth inch), which is standard for most kitchen backsplash tile. If your backsplash uses very small tile or requires joints narrower than 3 millimetres, unsanded cementitious grout is the technical choice, but this is less common in kitchen backsplashes.

Grout colour affects the perception of grease staining significantly. Light-coloured grout — white, cream, or light grey — will show grease discoloration faster and more visibly. Darker grout — dark grey, charcoal, or warm brown tones — hides grease stains much better and requires less frequent maintenance. This is largely an aesthetic choice, but it is worth considering in a kitchen where you want the backsplash to look pristine year after year.

One more practical tip: avoid grout in the grout joint itself. Wipe excess grout from the tile face immediately during grouting, and clean the joints thoroughly before the grout fully hardens. Grease loves to cling to rough grout surfaces, so smooth, properly cured grout is easier to keep clean than textured or poorly finished joints.

For most Ottawa homeowners, the choice comes down to budget and maintenance tolerance. If you want the lowest-maintenance, stain-proof option and are willing to pay a premium, epoxy is the answer. If you want to save money upfront and are committed to annual sealer maintenance, properly sealed sanded cementitious grout will serve you well for years. Either way, avoid unsealed grout in a kitchen — that is a recipe for permanent discoloration.

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