How to Apply Grout on Backsplash

Grout is an essential component when installing tile backsplashes. It fills the joints between the tile pieces, sealing them together to create a uniform surface. Applying grout properly ensures your backsplash looks neat, clean, and lasts for years. This comprehensive guide will teach you everything you need to know about grouting a backsplash, from materials and tools needed to techniques and finishing. Follow these tips for beautiful, professional results.

What is Grout?

Grout is a paste-like building material used to seal the joints between tiles. It creates a water-resistant surface that protects the substrate underneath. Grout is typically composed of sand, cement, and water mixed into a spreadable consistency. When it dries and cures, grout becomes rock hard, bonding the tile pieces together.

Using the proper grout for your application is imperative for good results. Grout comes in different formulas, like sanded and unsanded, standard, epoxy, and more. Sanded grout contains fine silica sand in the mixture and is best for wider joints of 1/8-inch or larger. It provides greater strength and durability. Unsanded grout has no sand, only cement and polymers. It’s ideal for narrow, residential tile joints less than 1/8-inch.

Match the grout color as close to your tile as possible for a seamless look. Most manufacturers offer grout in a wide range of hues. Pigmented grout resists staining better than standard white. Consider using a darker grout with light tile or a light grout with dark tile. Contrasting grout can look very striking as well.

Benefits of Grout

  • Seals joints between tiles
  • Creates a moisture barrier
  • Allows for consistent design with uniform joint lines
  • Helps prevent cracking and chipping of tile edges
  • Provides strength and durability to the tile installation
  • Resists mold, mildew, and bacterial growth
  • Available in various colors to complement the tile

Tools and Materials Needed

Installing grout on a backsplash requires a few simple tools and materials readily available at tile and hardware stores. Gather everything you need beforehand to make the job easier.


  • Grout float – For spreading and working the grout into joints
  • Grout sponge – Smooth damp sponge for wiping excess grout off tile
  • Buckets – For grout mixing and cleaning
  • Grout sealer – Protects grout from stains
  • Trowel – Useful for scraping any hardened grout
  • Grout finishing tool – Shapes and profiles joints for consistent lines
  • Shop vac – For cleaning up grout dust and debris


  • Grout – Use sanded grout for joints 1/8-inch or larger
  • Grout haze remover – Safely cleans off grout film or residue
  • Microfiber cloths
  • Grout sealing sponge
  • Painter’s tape
  • Drop cloths – Protect surrounding surfaces from mess
  • Tile sealant – Seal tiles before grouting for easier cleanup
  • Water – For mixing grout and cleaning
  • Gloves and eye protection

Preparing to Grout the Backsplash

Proper prep before grouting is critical for achieving quality results. Plan to grout your backsplash after the tile adhesive or mortar has fully cured, generally after 24-48 hours. Confirm the tiles are firmly attached and do not shift. Follow these key steps to get ready for grouting:

Clean the Tile Surface

Use a damp microfiber cloth to wipe all tile faces and remove any dirt, dust, adhesive, or debris. Tile surfaces must be clean for grout to adhere properly. Avoid any chemical cleaners, as they can interfere with bonding.

Apply Tile Sealant

Applying a quality tile sealant before grouting will make cleanup much easier by preventing grout from clinging to the tile faces. Use a sealant recommended for your specific tile material. Apply it according to manufacturer instructions, usually with a paintbrush.

Tape Off Surrounding Areas

Use painter’s tape to mask off any walls, countertops, or adjacent surfaces you want to protect from potential grout smears or splatters. Remove tape immediately after grouting before the grout dries.

Cover Floors and Furnishings

Lay down drop cloths in your workspace to safeguard floors, cabinets, and furnishings from grout spills. If possible, remove lower cabinets doors, drawers, or appliances from the backsplash area.

Fill Any Tile Joint Gaps

Inspect all tile joints and use sanded grout, tile adhesive, or caulk to fill any wider gaps or voids before grouting. This provides a uniform surface and prevents thin sections of grout that are prone to cracking.

Prepare Your Mixing Area

Set up your mixing station nearby with all tools, materials, and buckets. Have plenty of clean water and rags for cleaning hands and tiles. Arrange your work zone for efficiency.

Mixing the Grout

Mixing the grout properly is vital to achieving the right dense, cake-batter consistency needed to apply it smoothly into joints. Follow the manufacturer’s instructions, but generally these tips will help:

  • Only mix up as much grout as you can use in 30-45 minutes
  • In a bucket, pour in grout powder first
  • Slowly add cool clean water a bit at a time
  • Use less water for drier joints; more for wider joints
  • Stir constantly with a paddle to prevent lumps
  • Ideal consistency is like peanut butter, not too wet or too firm
  • Let the mixture slake or rest 5-10 minutes before applying
  • Re-stir just before applying, without adding more water

The right grout consistency fills joints completely without sagging or shrinking as it cures. Test your mixed grout on a piece of cardboard to ensure it has a uniform texture and spreads easily.

How to Apply Grout on the Backsplash

Once your grout mixture is ready, it’s time to start grouting. Use the following techniques for best results:

Apply With a Grout Float

Hold the grout float at a 45° angle and use it like a squeegee, pressing the grout firmly into the joints in a scraping motion. Apply in small 3-4 foot sections so the grout stays workable.

Work Diagonally Across the Joints

Spread the grout diagonally across tile joints, wiping off any excess on the tile surface as you go. This ensures joints are completely packed with grout.

Compact Tight Areas Well

Use the thin edge of the float to forcefully pack grout into corners, edges, and any narrow joints. Go slow to avoid misses.

Clean Excess Grout Off Tile

Let grout firm up slightly in the joints, usually 5-10 minutes. Then take a damp grout sponge and wipe diagonally across tiles to remove any haze or film, rinsing the sponge frequently.

Shape and Tool the Joints

Once grout firms up in the joints, use a rounded plastic finishing tool to shape them evenly. Carefully tool any high spots down by scraping the grout joints in one direction.

Avoid Wiping Joints Too Soon

After tooling joints, wait about 30-60 minutes before wiping them again. Wiping too early can pull grout out of joints. Dampen a clean sponge and lightly go over tiles.

Inspect Work and Touch Up

Look for any low spots without enough grout and reapply if needed. Also fill any pinholes or cracks with freshly mixed grout. Smooth with finishing tool.

Allow grout to fully cure for 24-48 hours. Avoid getting it wet during this time. Then seal grout according to manufacturer directions for added protection.

Grout Haze Removal Tips

Sometimes a slight film or haze remains on tile surfaces after grouting. This can happen if the grout was not wiped soon enough. Try these remedies to remove grout haze for clear, clean tiles:

  • Mix a solution of 1/4 cup vinegar + 1 gallon water. Apply with a soft sponge, rinse thoroughly.
  • Use a specialized grout haze removal product per label instructions. Harsh acids should be avoided.
  • Mix baking soda and water into a spreadable paste. Gently rub onto affected areas, then rinse off.
  • If haze persists, call a professional. Power washing or commercial-grade cleaners may be required.

Curing and Sealing Grout

Allowing grout proper curing time and sealing it afterwards are two keys to durability:

Let Grout Dry Completely

Grout needs 24-48 hours of drying time before getting wet. Extend this to 72 hours in cold or damp conditions. Keep the room well-ventilated.

Avoid Foot Traffic

No walking on freshly grouted areas for at least 24 hours. Wait 48-72 hours before replacing appliances, furniture, etc.

Apply Grout Sealer

Once grout has cured, apply a penetrating grout sealer like Aqua Mix Sealers Choice Gold. This creates a protective barrier against moisture and stains.

Seal Grout Annually

Reapply grout sealer at least once a year for high-traffic backsplashes. This maintains the water-resistant barrier and prevents erosion.

Proper curing and sealing locks in grout color, resists staining, and keeps joints sealed against moisture damage.

Grout Troubleshooting

Sometimes grout issues can arise on a backsplash install. Here are tips to resolve the most common problems:

Cracking Grout

Causes: Too much water in mix, improper curing, tile movement, normal shrinkage

Fixes: Re-grout cracks wider than 1/16”, ensure proper curing time, use flexible caulk in corner joints

Powdery Grout

Causes: Improper mixing, poor quality grout, contamination

Fixes: Remove and re-grout affected areas, ensure mixing directions followed

Grout Falling Out

Causes: Raked out too soon, poor adhesion, gaps in joints

Fixes: Allow proper curing time before cleaning, check bonding to tiles, fill wider joints before grouting

Grout Discoloration

Causes: Dirt, hard water minerals, improper sealing

Fixes: Use a grout whitener, reseal annually, test any cleaners on small area first

Grout Haze on Tiles

Causes: Not wiping off excess before drying, sealer residue

Fixes: Gently rub with baking soda paste, use acidic cleaners cautiously, call pros for tough cases

Grout Maintenance

Simple ongoing maintenance keeps your backsplash grout looking fresh and intact for the long run:

  • Sweep or vacuum loose dirt regularly to prevent buildup in joints
  • Mop only with warm water and mild pH-neutral cleaner
  • Reapply grout sealer every 12 months to protect from stains
  • Watch for any cracked or missing grout and repair promptly
  • Wipe spills quickly to avoid stubborn staining
  • Consider professional steam cleaning every few years

With proper installation techniques and care, the grout on your backsplash can last for decades, ensuring a durable and seamless finish.

Frequently Asked Questions

Should I seal tiles before grouting a backsplash?

Yes, sealing tiles beforehand is highly recommended. It provides a protective barrier that keeps grout from clinging to tile surfaces and makes cleanup much easier. Use the sealer type designed for your specific tile.

What is the best way to mix grout for a backsplash?

For optimal consistency and workability, first add grout powder to the bucket, then slowly incorporate cool clean water while mixing constantly with a paddle to avoid lumps. Let the mixture slake or rest 5-10 minutes before applying.

How soon can I wipe grout joints after applying to backsplash?

It’s best to let grout firm up and begin curing in the joints for 5-10 minutes before doing the initial wipe with a damp sponge. Wait 30-60 minutes before wiping down joints a second time.

Should sanded or unsanded grout be used on a backsplash?

For narrow tile joints under 1/8-inch, use unsanded grout. For wider grout lines 1/8-inch and over, sanded grout is recommended as it provides greater durability and strength.

What causes grout haze and how can it be removed?

Not wiping off excess grout before it dries causes a haze film on tiles. Try gently scrubbing with a baking soda paste or diluted vinegar solution. Be cautious using acidic cleaners and test first.


Grouting completes a backsplash install by sealing the tile joints into a uniform surface. With the right materials, preparation, and techniques, you can achieve professional-looking results. Always allow adequate drying time, wipe tiles thoroughly, and apply a grout sealant. Follow the manufacturer’s instructions for your products and repair any problem areas promptly. A well-grouted backsplash not only looks beautiful but also withstands moisture and everyday use for many years of service. With a quality installation, your new backsplash will be both a stylish and durable focal point in your kitchen.