Grouting the top of a backsplash is a common question that comes up during tile installation. The short answer is yes, you should grout the top of the backsplash where it meets the wall. Here’s a more in-depth look at why grouting the top is important and how to do it right.

Why Grout the Top of the Backsplash?

There are a few key reasons why it’s important to grout the top edge of the backsplash:

Prevents moisture damage – Grout creates a waterproof seal along the top edge. This prevents spilled liquids or moisture from penetrating behind the backsplash and causing damage to the wall over time.
Enhances appearance – A grouted top edge provides a clean, uniform finish. It looks more polished and pulled together than leaving an open gap at the top.
Adds stability – Grout helps adhere the tiles firmly in place along the top row. This prevents tiles from loosening or popping off over time.
Deters pests – Any cracks or open spaces can invite pests behind the backsplash. Properly grouting the top eliminates gaps and deters bugs.
Meets code – Most building codes require grout along the top edge as a standard practice. It’s an important step for proper installation.

So for appearance, durability, and proper installation, it’s recommended to grout the top of backsplashes. The only exception would be an undermounted sink where the counter surface overlaps the top edge.

How to Grout the Top Properly

Grouting the top edge takes a few simple steps:

1. Let Mortar Cure

Before grouting, ensure the thinset mortar has had time to fully cure – usually 24-48 hours. Grout applied too soon can be absorbed into the unset mortar and appear sunken or cracked.

2. Mix Grout

Mix an appropriate sanded grout according to package directions. Use a grout float or rubber grout trowel to apply. Using a soft sponge and bucket of clean water, smooth and shape into a uniform top edge.

3. Clear Top Edge

Carefully wipe grout off the top edge of the tile. You want grout only in the joint, not on the tile surface. Use a dry cloth or cheesecloth to polish off any haze.

4. Seal Grout

Once cured, seal the grout lines with a penetrating sealer. This adds water-resistance and stain protection.

5. caulk Edge

Finally, run a bead of mildew-resistant silicone caulk along the top corner edge where the backsplash meets the wall. This gives a perfect finished edge.

Backsplash Height Considerations

When installing a backsplash, also consider the height. General guidelines recommend:

4-6 inches above countertop for a standard backsplash height
6-8 inches if you have particularly tall counters or appliances below like ranges
Extending to bottom of upper cabinets for a full backsplash

Measure the space appropriately and cut tiles to fit. The bottom edges should sit just slightly above the countertop, not directly on it. This allows grouting the bottom seam as well.

Tips for Pro-Looking Results

Follow these tips for a seamless finished look:

Maintain even grout lines 1/8 – 3/16 inches for consistency
Cut edge tiles to appropriate heights using a wet saw for clean edges
Pre-seal porous tiles like natural stone to prevent grout staining
Use non-sanded grout for joints 1/8 inch and smaller
Let grout cure fully before sealing and applying caulk
Use matching sanded caulk in corners for a smooth transition

Common Questions

Should I grout above a backsplash?

Yes, you should grout any joints between tiles along the top edge. This seals the backsplash installation and prevents moisture penetration behind the tiles.

What about the gap between the backsplash and wall?

The gap between the backsplash and wall should be filled with caulk, not grout. Caulk allows for slight movement and provides a waterproof seal in corner joints.

How high should backsplashes extend?

Standard backsplash height is 4-6 inches above the counter. Full backsplashes extend all the way to the underside of upper cabinets, typically 18 inches or more. Measure your space to determine desired height.

Can I grout a polished edge backsplash?

Polished or laminated backsplash edges with no exposed joints do not need to be grouted. The solid surface creates a built-in seal and prevents moisture intrusion.

How soon can I grout after installing backsplash tiles?

It’s best to allow tile mortar to fully cure for 24-48 hours before applying grout. Grouting too soon increases the risk of cracking, sagging, and other grout failures.

Conclusion

Grouting the top of a backsplash provides an attractive finished edge and seals the installation. Allow mortar to fully cure, apply high-quality sanded grout, clean off any haze, and seal with caulk. Maintaining 1/8-3/16 inch grout lines and cutting edge tiles to fit ensures a professional quality result. With proper planning and careful technique, you can grout your backsplash top and achieve a beautiful, water-resistant finish.

Do You Grout the Top of a Backsplash? – FAQ

Here are answers to some frequently asked questions about grouting the top of a backsplash:

Should I grout above a 4-inch backsplash?

Yes, you should grout any joints between tiles along the top edge, even on a short 4-inch backsplash. Filling the joints waterproofs the installation and gives a polished finish.

What’s the best way to get a clean grout line across the top?

Use a grout float or rubber grout trowel to press grout evenly across the top joint. Wipe diagonally across the joint to prevent dragging grout onto the tile face. Clean any haze immediately with a damp sponge.

What grout color should I choose?

Choose a grout color that matches or complements your tile color. White and light grey are popular choices. Contrasting grout can be an option for a decorative effect.

Should I grout the joint between the backsplash and countertop?

Yes, any joint between the bottom edge of the backsplash and the countertop should be grouted to adhere the tiles and prevent moisture intrusion.

Is caulking needed after grouting the top edge?

Caulking is recommended after grouting. The caulk seals the top corner joint between the backsplash and wall for a waterproof finish.

What’s the best way to get a straight grout line across the top edge?

Carefully lay a straight 1/8-inch foam backer rod across the top joint to guide your grout float. This helps maintain an even top grout line. Remove the backing after grouting.

How soon can I wipe down the backsplash after grouting?

It’s best to wait 24-48 hours before cleaning grout haze off the tile surface. This allows it to cure properly. Gently wipe diagonally using a soft, damp sponge.

Should I seal my backsplash after grouting?

Sealing with a penetrating grout sealer is recommended. This adds stain and water resistance. Wait at least 72 hours after grouting before applying grout sealer.

How do I prevent cracking in top edge grout lines?

Allowing proper mortar cure time, using appropriate grout for joints, cleaning haze promptly, and sealing the grout prevents common cracking issues.

Conclusion

Grouting the top edge of a backsplash is an important finishing step. It provides an attractive, clean finish while sealing the installation and preventing moisture penetration behind the tiles. Allowing adequate cure time, using proper materials and techniques, cleaning promptly, and sealing will help ensure the grout lines remain crack-free. Paying attention to detail as you grout the top of the backsplash results in a professional quality finish.