Materials
Epoxy vs cement grout: when the expensive one is worth it
6 min read · Updated 15 July 2026
The short answer
Use epoxy grout where staining, chemicals or constant water are certain: shower floors, wet rooms, kitchen worktops and splashbacks, commercial kitchens, pools. Use cement grout everywhere else — it is cheaper, easier to repair, and perfectly durable on normal walls and floors.
What actually differs
Cement grout is a cementitious powder mixed with water or a latex additive. It is porous, so it absorbs water, dye from tea and wine, and grease. Epoxy grout is a resin and hardener with a filler; it cures into a solid, non-porous plastic that absorbs essentially nothing and resists acids, fats and chlorine.
The trade-off is installation. Epoxy has a short pot life, must be cleaned off the tile face before it cures, and is unforgiving on textured or unglazed tiles where it can stain the surface permanently. It costs three to five times more in material and adds real labour time.
Where epoxy earns its money
Four situations where we specify it without hesitation:
- Shower floors and wet rooms — permanent moisture, and mould in cement joints is a lifelong annoyance.
- Kitchen splashbacks and worktops — fat, wine, turmeric and tomato all stain cement grout within weeks.
- Commercial kitchens — steam cleaning and food acids erode cement grout, and the eroded joint harbours bacteria.
- Swimming pools and hot tubs — chlorine and salt water dissolve cement grout over a few seasons.
Where cement grout is the right answer
Ordinary bathroom walls above the splash zone. Hallway and living-area floors. Any large area where the cost difference is significant and the risk is low. And crucially, any floor you may want to repair locally later — cement grout can be raked out and replaced invisibly; epoxy fights back.
A good flexible cement grout with a latex additive, correctly mixed and fully compacted into the joint, lasts decades in a normal room.
Grout colour and joint width
Wider joints show more grout, so colour choice matters more. Rectified tiles at 2mm can take a matched colour and vanish; a 5mm joint on a rustic tile is a design element and should be chosen deliberately. On floors, go slightly darker than the tile — pure white floor grout looks superb for about four weeks.
Silicone, not grout, in corners
Whatever grout you choose, every internal corner, wall-to-floor junction and change of plane gets a colour-matched silicone instead. Corners move; grout does not bend. A cracked line of grout in a shower corner is not a defect in the grout — it is a missing movement joint.
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