What Is the Best Grout for a Shower?

What Is the Best Grout for a Shower?

Choosing the right grout for a shower is one of the most important decisions in a tile shower project. Showers are the most demanding environment for tile and grout — constant moisture, temperature changes, and cleaning chemicals all stress the grout. After decades of installing tile showers in Oklahoma homes, we explain which grouts perform best and why.

Why Shower Grout Choice Matters

Showers are continuously wet environments. The grout must withstand:

• Constant moisture — showers are wet daily.
• Temperature changes — hot showers, cold air.
• Cleaning chemicals — harsh cleaners break down some grouts.
• Mold and mildew — damp environments support growth.
• Movement — slight structural movement stresses grout.
• Soap scum — accumulates in porous grout.

Types of Shower Grout

Cement Grout (Sanded and Unsanded)

• Material: Portland cement, sand, and pigments.
• Cost: Lowest cost option.
• Durability: Moderate; porous and susceptible to staining.
• Water resistance: Requires sealing; porous when unsealed.
• Maintenance: Requires periodic sealing (every 1-2 years).
• Stain resistance: Poor when unsealed; moderate when sealed.
• Best for: Budget-conscious projects; not ideal for showers.

Sanded cement grout is used for joints 1/8 inch or wider; unsanded for joints less than 1/8 inch. Cement grout is the least suitable choice for showers due to its porosity.

Epoxy Grout

• Material: Epoxy resins and hardener with filler powder.
• Cost: Higher cost; 2-3 times cement grout.
• Durability: Excellent; extremely durable.
• Water resistance: Waterproof; non-porous.
• Maintenance: No sealing required; easy to clean.
• Stain resistance: Excellent; resists most stains.
• Best for: Showers, wet areas, and high-traffic installations.

Epoxy grout is the best choice for showers. It is non-porous, waterproof, and resistant to staining and mold.

Urethane Grout

• Material: Urethane-based formula with pre-mixed components.
• Cost: Mid-to-premium pricing.
• Durability: Excellent; flexible and crack-resistant.
• Water resistance: Water-resistant; non-porous when cured.
• Maintenance: No sealing required.
• Stain resistance: Excellent.
• Best for: Showers and areas with movement.

Urethane grout is flexible and crack-resistant, making it ideal for showers with slight movement.

Single-Component Grout (Ready-to-Use)

• Material: Polymer-modified, pre-mixed grout.
• Cost: Mid-range pricing.
• Durability: Good; varies by brand.
• Water resistance: Good; check manufacturer specifications.
• Maintenance: No sealing required for most brands.
• Stain resistance: Good to excellent.
• Best for: Showers; easier to install than epoxy.

Comparison: Shower Grout Types

Feature	Cement	Epoxy	Urethane	Single-Component
Cost	Low	High	Mid-premium	Mid
Water Resistance	Poor (porous)	Excellent (waterproof)	Excellent	Good
Stain Resistance	Poor	Excellent	Excellent	Good
Sealing Required	Yes (annually)	No	No	No
Mold Resistance	Poor	Excellent	Excellent	Good
Crack Resistance	Fair	Good	Excellent	Good
Best for Shower	No	Yes (best)	Yes	Yes

Our Recommendation for Showers

For tile showers, we recommend:

• Best overall: Epoxy grout — waterproof, stain-proof, and mold-resistant.
• Best for movement: Urethane grout — flexible and crack-resistant.
• Budget option: High-quality single-component grout — easier to install than epoxy.
• Avoid in showers: Cement grout — too porous and susceptible to staining and mold.

Grout Joint Width

Grout joint width affects performance:

• 1/16 inch — unsanded grout; for rectified tile; shows lippage.
• 1/8 inch — sanded or unsanded; common for wall tile.
• 3/16 to 1/4 inch — sanded grout; for floor tile and larger joints.

Narrower joints show lippage more; wider joints are more forgiving but require more maintenance with cement grout.

Grout Color

Grout color affects both appearance and maintenance:

• Light colors — show dirt and stains; require more cleaning.
• Dark colors — hide dirt and stains; may show soap scum.
• Medium colors — balance appearance and maintenance.
• Matching color — grout that matches tile creates a seamless look.
• Contrasting color — highlights tile pattern.

For showers, medium colors are practical — they hide dirt without showing soap scum as prominently as dark colors.

Oklahoma Considerations

Oklahoma homes with foundation movement benefit from flexible grout (urethane or epoxy) that can tolerate slight movement without cracking. Oklahoma's humid climate makes mold resistance especially important — epoxy and urethane grouts resist mold better than cement grout.

Key Takeaways

• Epoxy grout is the best choice for showers — waterproof, stain-proof, and mold-resistant.
• Urethane grout is flexible and crack-resistant — ideal for homes with movement.
• Cement grout is porous and requires sealing — not ideal for showers.
• Single-component grouts offer a balance of performance and ease of installation.
• Medium grout colors balance appearance and maintenance.

Common Mistakes to Avoid

• Using cement grout in a shower environment.
• Not sealing cement grout after installation.
• Choosing light grout colors that show dirt and stains.
• Using narrow grout joints with non-rectified tile.
• Using harsh chemicals that break down grout.

Questions to Ask Before You Buy

• Which grout type is best for my shower?
• Should I choose epoxy, urethane, or single-component grout?
• What grout color is most practical for maintenance?
• What grout joint width is appropriate for my tile?
• Does this grout require sealing?

Maintenance Tips

• Squeegee the shower after each use to remove water.
• Clean grout with pH-neutral cleaners; avoid harsh chemicals.
• Seal cement grout annually if used in showers.
• Address cracked or missing grout promptly to prevent water damage.
• Ensure proper ventilation to reduce moisture and mold.

When to Speak with a Flooring Professional

A tile professional can recommend the best grout for your shower based on tile type, joint width, and your maintenance preferences. They can explain the cost differences and help you choose a grout that will perform for decades.

Bottom Line

Epoxy grout is the best choice for showers — it is waterproof, stain-proof, and mold-resistant. Urethane grout is an excellent alternative for homes with movement. Avoid cement grout in showers due to its porosity and maintenance requirements. Choose a medium grout color for practical maintenance, and ensure proper joint width for your tile.

Related Articles

• Should You Use Epoxy Grout or Cement Grout?
• Why Does Shower Grout Crack?
• Does Shower Tile Need to Be Sealed?
• What Is a Waterproof Shower System?

Still have questions? Visit your nearest Premier Carpet & Tile showroom to speak with an experienced flooring professional who can help you plan your project with confidence.

Key considerations

• Epoxy grout is the best choice for showers — waterproof, stain-proof, and mold-resistant
• Urethane grout is flexible and crack-resistant — ideal for homes with movement
• Cement grout is porous and requires sealing — not ideal for showers
• Single-component grouts offer a balance of performance and ease of installation
• Medium grout colors balance appearance and maintenance

A common misconception

Many homeowners believe all grout is the same and choose based on price or color alone. In shower environments, the wrong grout choice leads to cracking, staining, mold, and premature failure. Epoxy and urethane grouts cost more upfront but provide dramatically better performance in wet areas.

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