How do I choose between epoxy grout and cement-based grout for my bathroom tile?

For most GTA bathroom renovations, epoxy grout is the superior choice for shower floors, shower walls, and any high-moisture area, while cement-based grout remains a perfectly acceptable and more budget-friendly option for bathroom floors and walls outside the shower enclosure. The decision comes down to moisture exposure, maintenance tolerance, and budget.

Cement-based grout (both sanded and unsanded) is the traditional choice and still accounts for the majority of bathroom tile installations across Toronto. It is affordable — typically $0.50–$1.50 per square foot of tiled area for materials — easy for installers to work with, and available in a wide range of colours. The downside is that cement grout is porous, which means it absorbs water, stains, and can harbour mould and mildew over time. In a GTA bathroom, where summer humidity pushes indoor moisture levels higher and shower use creates constant wet conditions, cement grout requires sealing after installation and re-sealing every 1–2 years to maintain its stain resistance and water repellency. Many Toronto homeowners skip this maintenance, and within a few years their grout darkens, stains, and develops mould — particularly on shower floors and in the lower portions of shower walls where water exposure is greatest.

If you do go with cement-based grout, choose a high-performance polymer-modified formula like Mapei Keracolor U or Prism, or Custom Building Products Prism. These formulations include polymers that improve water resistance and flexibility compared to basic cement grout. For bathroom floors, sanded grout is used for joints wider than 1/8 inch, while unsanded grout is used for joints 1/8 inch and narrower (common with polished marble and tightly spaced tile).

Why Epoxy Grout Excels in Bathrooms

Epoxy grout is a two-part system (resin and hardener) that cures to a non-porous, waterproof, and chemically resistant surface. It never needs sealing, resists staining from soap scum, hair products, and hard water deposits, and does not support mould growth. For Toronto bathrooms — where hard water is a constant reality and humidity management is an ongoing challenge — epoxy grout eliminates the most common grout maintenance headaches.

The trade-offs are cost and installation difficulty. Epoxy grout materials run $3–$6 per square foot of tiled area — roughly 3–4 times the cost of cement grout. More significantly, epoxy grout is harder to work with: it has a shorter working time before it begins to set, it requires meticulous cleanup during installation (once cured, it is extremely difficult to remove from tile surfaces), and it demands an installer experienced with the product. Not all tile installers in the GTA are comfortable working with epoxy grout, and the ones who are typically charge a premium for the additional labour. Expect to pay $2–$5 more per square foot for epoxy grout installation compared to cement-based.

Popular epoxy grout products available through GTA tile suppliers include Mapei Kerapoxy, Laticrete SpectraLOCK, and Ardex WA. Laticrete SpectraLOCK is often considered the most DIY-friendly epoxy grout, though shower grouting is still best left to professionals.

The Practical Approach

Many experienced Toronto bathroom contractors take a hybrid approach: epoxy grout on the shower floor and shower walls where moisture exposure is constant and maintenance access is difficult, and high-quality polymer-modified cement grout on the main bathroom floor and vanity backsplash where moisture exposure is intermittent and re-grouting or re-sealing is more accessible. This balances cost with performance — you get the waterproof, maintenance-free benefits of epoxy where it matters most, without the added expense across the entire bathroom.

For a typical GTA bathroom renovation with approximately 80–120 square feet of tile, the material cost difference between all-cement and all-epoxy grout is roughly $200–$500, and the labour premium adds another $200–$600. Relative to the total cost of a bathroom renovation — typically $15,000–$35,000 in the Toronto market — this is a modest upgrade that pays dividends in reduced maintenance for years to come.

Whichever grout you choose, confirm with your tile installer that they are using the appropriate grout type for the tile format, joint width, and application area. Your installer should also apply grout sealer to all cement-based grout joints within 48–72 hours of grouting, before the bathroom is put into regular use.