Grout is an essential material used in tiling projects to fill in the spaces between tiles, binding them together and providing a clean, uniform look. When applied to a wall area partially or fully covered in tile, this is referred to as a “grout backsplash.”
Properly grouting a backsplash is an important process that protects the underlying surface, prevents moisture damage and gives a polished finish. While grouting may appear straightforward at first glance, there are some key considerations when learning how to grout backsplash areas in your kitchen or bathroom.
What is Grout?
Before diving into the specifics of grouting a backsplash, it helps to understand exactly what grout is and why it’s used.
Grout is a cement-based material available in sanded and unsanded varieties. It is mixed with water to a thick, spreadable consistency and pushed down into the seams between tiles to fill gaps and create a smooth, uniform surface.
Benefits of Using Grout:
- Binds tiles together for a sturdy installation
- Seals seams to prevent moisture penetration
- Provides an attractive, streamlined appearance
- Allows flexibility for slight tile expansion/contraction
- Comes in different colors to complement tiles
In a backsplash application, grout provides adhesion for wall tiles and waterproofs the surface behind them. It is typically tinted to match or contrast with the tile colors for visual appeal.
The decision of whether to use sanded or unsanded grout depends on the tile size and thickness. Sanded grout contains fine silica sand and is best for joints wider than 1/8 inch. For thinner tile installations, unsanded grout is the better choice.
Selecting the Right Grout
Choosing the appropriate grout type and color are important first steps for achieving the best backsplash results. Consider the following:
Grout Varieties
Unsanded Grout
- For joints 1/8 inch and narrower
- Smooth, fine consistency
- Grout lines show less with small tile
- Best for wall applications
Sanded Grout
- For joints wider than 1/8 inch
- Contains silica sand for bulk/strength
- Often used on floors
- Can be used on walls with larger tile
Epoxy Grout
- Extremely durable and stain resistant
- Ideal for countertops and heavy use areas
- More difficult to work with
- Costs more than traditional grout
Grout Colors
- Grey is versatile and matches most tile types and colors
- White can brighten up a space and make tile colors pop
- Black adds dramatic contrast and depth
- Matching the grout color to tiles creates a seamless look
- Contrasting grout can accentuate tile textures/patterns
Be sure to check the actual grout color against a tile sample before purchase. The end result often differs from the color on the label.
Grout Backsplash Preparation
Proper prep work is crucial for successful grouting that lasts.
Gather Supplies
- Grout (premixed or powder mix)
- Grout sealer
- Grout floats for spreading
- Grout sponges
- Buckets for mixing/washing
- Tape for protecting edges
- Tiling caulk for corners and edges
- Clean water
Protect Surrounding Areas
Cover countertops, floors, and other surfaces with rosin paper or plastic sheeting to prevent grout spillage and splatters during installation. Tape down coverings to keep them secure.
Remove any fixtures or accessories on or near the backsplash area prior to grouting. This includes soap dispensers, knives strips, cutting boards, decor items, etc.
Prepare Tile Surface
Before applying grout, ensure tile surfaces are clean and free of spacers, debris, dust, grease, and adhesives. Use a damp sponge to wipe tiles down and allow to fully dry.
Check for protruding lips or high edges around tiles and use a utility knife to carefully scrape/grind them even with the tile surface. Any high spots can prevent proper grout application.
Apply caulk in inside wall corners, edges, and tile seams as needed to prevent cracking and water intrusion. Avoid getting caulk between tiles where grout should be.
Allow caulk to fully cure before grouting, usually 24 hours.
Mixing and Applying Grout
With prep work complete, it’s time to mix and spread grout. Follow product instructions closely, as techniques vary by grout type.
Mixing Grout
For premixed grout, simply apply directly from the container per product guidelines. Remix occasionally when spreading to maintain smooth, lump-free consistency.
Powder grout requires mixing with water first. Measure carefully and mix to a thick peanut butter or dough-like consistency without excess water. Allow to slake (sit) for 10 minutes, then re-mix just before applying.
Spreading Grout
Use a grout float to force grout directly into joints, packing it down firmly to fill all voids evenly. Hold the float at a 45° angle and scrape diagonally across tiles to prevent pulling out grout.
Tip: Apply in small sections so grout stays workable, wiping off any excess immediately.
Push grout fully into crevices around tile edges and into corners for complete adhesion. Ensure joints are completely filled without gaps, cracks or low spots.
Remove any grout on tile faces using the edge of the float. Wipe diagonally across tile to prevent hazing or scratching of the surface.
Cleanup and Finishing
Allow grout to firm up slightly in joints, waiting about 20 minutes. Use a damp grout sponge to smooth joints and shape rounded grout lines. Rinse sponge frequently to prevent haze or film.
Change rinse water often to prevent cement particles from being redeposited. A light scrubbing in circular motions helps even out joints and remove excess film. Avoid excessive wiping or you may pull grout back out of joints.
Within 24 hours, apply a grout sealer per product instructions to protect from staining and improve water repellency. Avoid foot traffic or water contact until sealer fully cures.
Curing and Care
Proper curing and care will help new grout stay looking fresh.
Curing
- Allow 72 hours for complete grout cure before heavy use or cleaning
- Keep area ventilated and dry during curing period
- Avoid direct sunlight exposure to prevent premature drying
- Do not get grout wet during the first 3 days of curing
Care & Maintenance
- Seal grout annually or biannually to maintain protection
- Use pH-neutral cleaner for routine backsplash cleaning
- Re-seal if grout appears porous, discolored or shows dark lines
- Avoid abrasive scouring pads/cleaners that can damage grout
- Re-grout joints if cracking, pitting, or shrinking occurs
With the right techniques and care, a well-grouted backsplash will last for many years of beauty and service in the kitchen or bath. Proper grouting locks tiles in place, while also allowing the flexibility needed in an active environment. By selecting appropriate grout and applying it correctly, do-it-yourselfers can achieve professional-looking results.
Frequently Asked Questions About Grouting Backsplashes
Grouting can seem deceptively simple, but many common questions come up regarding best practices. Here are answers to some of the most frequently asked questions.
Should I use sanded or unsanded grout for my backsplash?
Use unsanded grout for backsplashes with grout joints less than 1/8 inch wide. The fine consistency fills narrow spaces best. Use sanded grout for wider grout lines over 1/8 inch where the extra bulk and sand is needed.
What’s the best way to apply grout?
Use a grout float to press grout firmly into joints, holding at 45° angle. Wipe diagonally across tiles with the edge to remove excess grout and shape joints. Let firm up slightly before finishing with damp sponge.
How soon can I get grout wet after applying?
Avoid water contact for 72 hours while new grout cures. This includes direct water splashing, steam, or high humidity. Early moisture exposure can cause grout cracking, poor adhesion or change in color.
Should I seal my grout?
Yes, use a penetrating sealer within 24 hours of grouting and reapply yearly. Sealer protects from stains, enhances water-resistance, and reduces maintenance needs.
How do I clean grouted backsplash tiles?
Use a pH-neutral cleaner and soft cloth/sponge for routine cleaning. Avoid harsh cleansers, bleach, acids, or abrasive pads. Vinegar and water works well for hard water deposits or soap scum.
What causes cracks or holes in grout?
Lack of sealing, moisture issues, or tile movement can cause cracks. Holes may indicate air pockets that didn’t get filled. Remove damaged grout and re-grout for the best long-term durability.
Can I change the color of my existing grout?
Yes, you can apply a colored grout stain or paint to alter the grout color. Be sure to prep and seal the existing grout first for best results. Test in an inconspicuous spot.
How long does grout last?
With proper installation and care, quality grout can last 20-50 years or longer. Cracking, staining, or shrinkage over time indicates a need to re-grout joints for a fresh appearance and waterproofing.
Grout Backsplash Tips and Tricks
Mixing Tips
- Only mix what you can use in 30 minutes for best workability
- If grout thickens while spreading, remix without adding water to restore consistency
- When powder mixing, add powder to water for optimal hydration (not water to powder)
Application Tips
- Apply in small sections no larger than 3-4 sq. ft. to control drying time
- Keep a wet edge to prevent quick drying and color variations
- Work any low spots with a grout knife before wiping with sponge
Cleanup Tips
- Change rinse water frequently to limit haze and film
- Wipe diagonally across tiles to avoid pulling out grout
- Use minimal water when sponging – damp not saturated sponge
Curing Tips
- Mist the grout occasionally for even curing the first 3 days if very dry
- Put up signs/notices so others don’t use the backsplash before cured
- Avoid direct fans, heat, or sunlight on curing grout
Grout Haze Removal Tips
- Use pH neutral cleaner and non-abrasive white scrub pad
- Spot treat stubborn haze with diluted vinegar solution
- Avoid acidic cleaners if epoxy grout was used
Grouting a Backsplash Perfectly
Grouting adds the finishing touch to a backsplash installation. By following best practices, you can achieve perfectly grouted joints.
Step 1 – Gather Materials
Have on hand the grout, grout float, sponges, sealer, and other supplies before starting. Prepare your tiles by cleaning thoroughly and caulking edges/seams.
Step 2 – Mix Grout
For premixed varieties, just open the container. For powders, slowly add powder to water while mixing to a thick, creamy consistency per product guidelines.
Step 3 – Spread Grout
Apply a small amount to start and work in sections. Using a grout float, pack grout firmly into all joints by holding at 45° angle and applying pressure.
Step 4 – Shape and Compact
Let sit briefly until grout firms slightly. Use the edge of the float to cut excess grout off the tile faces. Then use a damp sponge in a circular motion to shape grout lines and compact joints.
Step 5 – Clean Tile Surface
Wipe diagonally across tiles with minimal water to remove remaining film/haze. Buff tiles gently with a soft cloth once dry to reveal sheen.
Step 6 – Allow to Cure
Let grout cure 72 hours before getting wet. Apply sealer within 24 hours. Avoid foot traffic or cleaning during curing for best results.
Step 7 – Admire Your Work
Your grouted backsplash will provide a sanitary, polished look for years to come. Re-seal grout annually and clean with pH-neutral products to maintain its beauty.
Grout Backsplash Do’s and Don’ts
For optimal backsplash grouting, keep these handy do’s and don’ts in mind.
Do:
Do thoroughly mix powder grout to a smooth, lump-free consistency.
Do apply in small manageable sections to control drying time.
Do pack grout firmly into joints with consistent pressure and fill any low spots.
Do smooth grout lines and shape joints uniformly when sponging off excess.
Do change rinse water frequently to limit recycled grout film on tiles.
Do work cleanly and rinse sponges well to minimize mess.
Do allow full 72 hour cure before exposing grout to moisture.
Do seal grout within 24 hours and annually thereafter.
Don’t:
Don’t mix grout too thin or wet which weakens it.
Don’t allow sections to dry too fast which causes color variations.
Don’t fail to fully pack joints leaving unfilled voids.
Don’t overlush grout onto tiles or shape joints unevenly.
Don’t allow grout film or haze to dry hard on tiles making removal difficult.
Don’t allow spills, splatters or foot traffic before grout has cured.
Don’t allow stains or damage to occur by not sealing grout regularly.
Achieving a Flawless DIY Grout Backsplash
With the right prep, products and techniques, even novice DIY-ers can achieve stunning backsplash grouting that looks professionally done. Follow this checklist for flawless results:
- [ ] Select quality grout suited for joint size – unsanded for wall tiles
- [ ] Arrange work area cleanly with covers to protect surroundings
- [ ] Clean tiles thoroughly and caulk edges/seams to prevent cracks
- [ ] Carefully mix grout to ideal consistency without lumps
- [ ] Apply in manageable sections for optimum workability
- [ ] Pack grout firmly and scrape off excess before drying on tile
- [ ] Shape joints evenly when firming up, rinsing sponge frequently
- [ ] Allow full 72 hour cure time before exposure to moisture
- [ ] Apply penetrating grout sealer within 24 hours of installation
- [ ] Routinely re-seal grout every 12-24 months
With attention to detail, having the right tools, and following best practices, it is definitely possible for a DIYer to achieve picture-perfect grout lines and joints. Proper grouting not only improves aesthetics but also ensures backsplashes are waterproof, sanitary and built to last.
References and Sources for Further Reading
[1] Marfil, J. (2021). Grout: A Complete Guide for Proper Installation and Care. Home Depot. https://www.homedepot.com/c/ah/how-to-apply-grout/9ba683603be9fa5395fab901c14b1f12
[2] How to Grout Tile Backsplash. (2020). Lowe’s. https://www.lowes.com/n/how-to/tile-a-backsplash-how-to-grout-tile
[3] Taylor, B. (2021). Grouting Tile Backsplash: What You Need to Know. The Spruce. https://www.thespruce.com/how-to-grout-tile-backsplash-1822678
[4] How to Grout. (2022). Mapei. https://www.mapei.com/us/en-us/project-references/how-to-grout
[5] Lawrence. (2019). When to Use Sanded vs Unsanded Grout. The Home Depot. https://www.homedepot.com/c/ah/when-to-use-sanded-vs-unsanded-grout/9ba683603be9fa5395fab90d52c560f12
[6] Grouts – Frequently Asked Questions. (2022). Custom Building Products. https://www.custombuildingproducts.com/faqs/grouts.aspx