Grout for Tile: Types, Uses & How to Choose the Best Grout

Grout fills the joints between tiles, supports edges, creates a finished surface, and is crucial to tile installation. Choosing the right grout for tile helps protect tile joints and makes the finished surface easier to maintain. The selection matters for places such as kitchens, showers, patios, and any installations that include natural stone or marble. 

What Are the Main Types of Grout?

There are four chemistries, plus pre-mixed types of grout as a supplied form of grout. The main types are traditional cement grout, polymer-modified cement grout, epoxy grout, single-component grout, and pre-mixed grout. Different types of grout act differently in terms of water absorption, stain resistance, application, and cost.

What Is Cement Grout?

A cement grout is the oldest type of grout that uses cement, fillers, pigments, and other additives to fill tile joints. You can get it in sanded and unsanded formulas. Standard cement grout is economical and widely available, but it has a porous structure. It can absorb moisture and stains, so most cement grouts require a compatible grout sealer. Remove cement residue from compatible porcelain surfaces with an appropriate cement remover, following the product instructions.

What Is Polymer-Modified Cement Grout?

A polymer-modified cement grout contains polymers that improve properties like adhesion, flexibility, and stain resistance. Some of these grouts offer reduced water absorption and more consistent color. However, the performance depends on the formulation. That is why you should check the technical data sheet rather than assume every polymer-modified grout offers the same protection. 

What Is Epoxy Grout?

Epoxy grout mixes the epoxy resin, a hardener, and fillers that create a dense, stain-resistant joint. Some formulations contain 100% solids, meaning the product doesn’t feature any volatile solvent or water component. Epoxy grout is ideal for demanding installations, but you should consider its working time and cleanup requirements as well. Clean epoxy grout residue promptly, using a compatible epoxy cleaner when recommended by the product manufacturer.

What Is Single-Component Grout?

Single-component grout comes ready to use or requires minimal preparation, depending on the selected product. Its binder may differ from traditional cement, and some formulas offer strong stain resistance without sealing. Check whether the product permits use on floors, outdoors, or in continuously wet areas.

What Is Pre-Mixed Grout?

You can find this grout type in a container that doesn’t require any mixing. The name of this grout explains its supplied form and not its chemical composition. Before buying, confirm the manufacturer’s restrictions for shower floors, immersion, exterior installations, and joint width.

Type	Joint width	Water absorption	Sealing	Relative cost	DIY difficulty
Cement	Product-specific	Generally higher	Usually recommended	Low	Low to moderate
Polymer-modified cement	Product-specific	Varies; often reduced	Product-dependent	Low to medium	Moderate
Epoxy	Product-specific; often 1/16–1/2 in.	Very low	Not normally needed	High	High
Single-component	Product-specific	Varies	Usually unnecessary for approved products	Medium to high	Low to moderate
Pre-mixed	Product-specific	Varies by chemistry	Product-dependent	Medium	Low to moderate

Which Grout Is Best for Each Room?

Different tile installation projects require different grout because of the installation environment. Shower floor tile should withstand regular moisture and cleaning, while a kitchen backsplash needs strong stain resistance. Outdoor patios require grout rated for exterior conditions and expected movement. Match the grout to the tile, joint width, and installation environment rather than choosing one product for every room.

Room or area	Best Grout	Best Alternative	What To Consider	What To Avoid
Shower walls	Polymer-modified cement or epoxy	Single-component	Moisture and cleaning	Grout unsuitable for wet areas
Shower floor	Epoxy or suitable high-performance cement grout	Approved single-component	Drainage, traction, and frequent water exposure	Assuming grout replaces waterproofing
Kitchen backsplash	Cement or single-component	Epoxy	Cooking grease and food splashes	Grout that stains easily
Kitchen floor	Polymer-modified cement or epoxy	Single-component	Foot traffic and spills	Unrated indoor-only products outdoors
Outdoor patio	Exterior-rated cement grout	Approved exterior system	Weather, drainage, and movement	Interior grout not rated for exterior use
Swimming pool	Pool-rated epoxy or specified pool grout	Approved cementitious system	Pool chemistry and continuous immersion	Standard grout without pool approval
Heated floor	Compatible cement or epoxy grout	Approved single-component	Temperature changes and movement joints	Rigid grout across movement joints
Garage	High-performance cement or chemical-resistant epoxy	Product-specific system	Vehicle traffic, oil, and chemicals	Ordinary grout for demanding exposure
Natural stone	Stone-compatible cement or epoxy	Unsanded grout where specified	Porosity, scratching, and discoloration	Untested dark grout on pale marble

These considerations are helpful when you start searching for grout for tile, but don’t treat them as universal specifications. For pools, heated floors, garages, and natural stone, make sure that the grout manufacturer approves the full installation system.

How to Choose the Best Grout for Tile 

Choosing the right grout for tile helps protect tile joints and makes the finished surface easier to maintain. Consider the tile type, joint width, and installation location before selecting a product.

• Start by measuring the joint width. Use unsanded grout under ⅛ inch and sanded grout at 1/8 inch and wider.
• Understand your selected tile. Glass and softer stone surfaces like polished marble require a non-abrasive, non-staining product. Check the grout first on a small, non-visible area.
• Check the exposure; areas with constant water and chemicals (pool areas) need epoxy or an approved high-performance grout.
• Outdoor and heated floors need an exterior-rated or approved product and movement joints.
• Grout color should be your last consideration. Test a dried sample because tile grout may look darker or lighter when wet. 
• Verify the data sheet. Confirm the standard (A118.6, A118.7, or A118.3), the joint range, and the permitted locations.

What Is Tile Grout Used For?

The grout is used to fill the joints between porcelain, ceramic, and natural stone tiles. It supports tile edges, limits debris buildup, and creates a finished surface that is easier to clean. Grout can also resist stains and moisture according to its formulation. However, do not assume grout is a replacement for waterproofing membranes or joint movement. Common uses of tile grout include:

• Fills the joints and closes the gaps between floor, wall, backsplash, and shower tiles.
• Prevents debris accumulation between joints by reducing dirt collection.
• It improves stain resistance; especially epoxy and other high-performance grouts resist stains in kitchens, bathrooms, and commercial spaces.
• It complements marble, travertine, and other stone tiles when the grout is compatible with the stone’s porosity and finish. 
• It helps set outdoor paving by filling the joints in approved patio and exterior tile systems. 

When grout matches the weather exposure and expected movement, it increases the efficiency of outdoor paving.

Sanded or Unsanded Grout: Which Should You Use?

The unsanded grout is ideal for joints under 1/8 inch and sanded grout for up 1/8 inches or wider. Sanded grout features fine aggregate that resists shrinkage in wide joints, but it can scratch polished marble and glass. 

Choose unsanded grout for polished marble and scratch-prone surfaces and sanded grout to reduce shrinkage in wider joints.  Check the selected grout’s approved joint width and test delicate tile before grouting. 

• Sanded grout contains fine sand or aggregate, which is generally suitable for joints ⅛ inch or wider. Its abrasive texture can scratch polished marble, glass, and some soft tile finishes.
• Unsanded grout has a smooth texture and is ideal for narrower joints under ⅛ inch. It may shrink or crack when used in joints wider than the product permits.

Expert tip: We recommend not choosing the grout according to wall or floor placement alone. Match the joint width to the grout, tile finish, and manufacturer’s specifications.

Do You Need to Seal Grout?

Traditional cement grout requires a compatible penetrating sealer, while epoxy and many single-component grouts do not require sealing. Check the product instructions before applying sealer and wait for it to cure for the specified period. A penetrating sealer reduces absorption and helps resist stains, but it doesn’t make a tile installation waterproof.

Once the recommended curing period is completed, place a few drops of tile cleaner for porcelain pavers on the clean, dry cement grout. If the water absorbs quickly, the grout will need to be sealed. However, you will still need to follow the manufacturer’s instructions.

For routine maintenance, use a cleaner suitable for your grout and tile material. Learn more about choosing the right grout cleaner to remove dirt and stains without damaging the surrounding surface.

Which Grout Works for Natural Stone, Glass, and Large-Format Tile?

You should select the grout that is well suited to the stone tile’s finish, porosity, and joint dimensions. Travertine and marble tiles are prone to staining or etching when exposed to unsuitable products. Glass can also be scratched while grouting, while large-format tiles often use narrow joints with compatible grout.

• For marble and travertine tiles, test the grout in small areas for staining and use a pH-neutral cleaner approved for calcium-based stone. Do not use a cleaner with abrasive or acidic substances, which can etch these surfaces.
• For glass tiles, check the glass manufacturer’s grout recommendations. Abrasive aggregate can scratch some delicate finishes, and dark pigments can affect the appearance of translucent glass. 

Follow the tile and grout manufacturer’s joint-width requirements. You may opt for narrow joints for rectified edges, but grout shouldn’t be used to cover any uneven installation. It shouldn’t be considered a replacement for movement joints.

Why Does Grout Crack, Stain, or Turn Moldy?

Grout failures like cracks, stains, or mold are often the result of substrate movement, incorrect mixing, moisture, or poor maintenance. You should repair the main reason first before replacing the grout, or the same problem will keep happening.

Problem	Likely cause	Recommended response
Cracking	Movement or incorrect application	Correct the cause and regrout
Uneven color	Excess water or inconsistent washing	Clean or recolor if appropriate
Staining	Dirt, grease, or moisture	Use a compatible cleaner
Mold or mildew	Persistent moisture and residue	Clean and improve ventilation
White deposits	Moisture carrying salts to the surface	Address moisture and use a suitable treatment
Crumbling	Poor curing or unsuitable grout	Remove failed grout and replace it

When you have changed the plan or at the corners, using a compatible flexible sealant is usually required instead of rigid grout.  In showers, persistent dampness may signal drainage or waterproofing problems that surface cleaning cannot solve.

Frequently Asked Questions About Tile Grout

Common questions about the grout

What is the best grout for shower tile?

Epoxy grout is the best grout for shower tile and wet installation because of its strong stain resistance. A suitable cement grout can also perform well. Select a product approved for the shower’s tile and overall exposed conditions.

Is epoxy grout worth the extra cost?

Yes. Epoxy grout may have a higher upfront cost, but it performs well in installations prone to stains and requires frequent cleaning. 

Can you use wall grout on floors?

If the manufacturer’s instructions approve it for floor application and the required joint width. Some wall grouts are unsuitable for floor traffic.

How long does grout take to cure before you can walk on it?

Generally, a grout can take up to 24 hours to cure before one can walk, but some products may take longer. Check the manufacturer’s curing instructions.

Do you need to seal epoxy grout?

Most epoxy grouts don’t require sealing because of their low water absorption. Checking the product instructions before applying and treating is crucial.

What grout color hides dirt best?

Beige and medium gray usually hide dirt better than most whites. It is better to select a shade that complements the tile and is well suited to the room’s cleaning routine.

Bottom Line

When selecting the best grout for tile, consider the joint width, tile material, moisture exposure, stains, and movement. Cement grout is ideal for many standard installations, while the epoxy offers greater stain resistance. Working with delicate surfaces like glass, natural stone, shower tiles, and outdoor paving installations requires product compatibility verification.  Proper preparation, curing, and maintenance help protect the finished surface. Follow this approach to shop for the best grout like a pro.