Do You Caulk the Top of Backsplash?

Caulking the top of a backsplash is a critical step that should not be overlooked when installing a backsplash in your kitchen. Properly caulking the top creates a watertight seal that prevents moisture from getting behind the backsplash and causing damage over time. Here is a comprehensive guide on why you should caulk the top of the backsplash and how to do it correctly.

Why Caulk the Top of the Backsplash?

There are a few key reasons why it is essential to caulk the top of the backsplash:

Prevent Water Damage

The number one reason is to prevent water damage. The top of the backsplash meets the wall or countertop. This seam is vulnerable to water intrusion when cleaning the countertop or backsplash. Over time, water can seep into this gap and cause the drywall behind the backsplash to deteriorate. Caulking creates a watertight seal that keeps the moisture out.

Create a Finished Look

Caulking the top gives your backsplash installation a polished, finished look. The caulk seamlessly bridges the gap between the backsplash and wall or countertop. Without caulk, the seam is visible and looks unfinished. The caulk gives it a smooth, seamless appearance.

Allow for Expansion and Contraction

The backsplash may expand and contract slightly over time due to temperature changes. The caulk allows for this movement while keeping the seal intact. Rigid grout or adhesive would crack under the stress. The flexible caulk moves with the backsplash.

Prevent Dirt Buildup

Any gaps or seams collect dirt over time. Properly sealing the top with caulk prevents dirt, grime, and grease from building up in the crevices. It’s much easier to keep the area clean.

What Type of Caulk to Use

When caulking the top of the backsplash, it’s important to choose the right type of caulk designed for kitchen use:

  • Silicone – 100% silicone caulk is the top choice. It is waterproof, flexible, and won’t crack or deteriorate over time. Look for mold and mildew-resistant silicone.
  • Acrylic – Acrylic latex caulks are another good option meant for interior use. They are water-based and allow for easy tooling.
  • Polyurethane – Polyurethane caulks are durable and flexible. This type withstands high temperatures.
  • Epoxy – Epoxy caulks provide a super strong, rigid seal. However, the lack of flexibility makes them prone to cracking.

Silicone and acrylic caulks are the best choices for caulking the backsplash top. Avoid non-kitchen grade caulks like those meant for windows.

How to Caulk the Top of the Backsplash

Caulking the top of the backsplash takes a little skill to get a smooth seam:

Step 1: Prepare the Surface

The surface must be clean, dry, and free of old caulk or other residues. Scrub with household cleaner and rinse thoroughly. Allow to dry completely.

Step 2: Load the Caulk Gun

Cut the tip of the caulk tube at a 45-degree angle to get the right size opening. Load the tube into a caulk gun. Cut the tip straight across to open it up for caulking.

Step 3: Run the Initial Bead

Hold the caulk gun at a 45-degree angle to the seam. Begin running a bead of caulk along the top where the backsplash meets the wall or countertop.

Step 4: Tool the Caulk

Once finished, use a caulking tool, old credit card, or your finger to tool the caulk. This smooths it into a nice even bead and pushes it into the seam.

Step 5: Allow Proper Curing Time

It’s critical to allow the caulk to cure fully before exposing to water. This can take up to 7 days. Read the manufacturer’s directions.

Cleaning and Maintenance

With the top properly caulked, cleaning the backsplash is safe and easy:

  • Use a soft sponge or microfiber cloth with warm, soapy water. Avoid abrasive cleaners.
  • Rinse well and dry with a clean towel to prevent water spots.
  • Re-caulk the top seal periodically or if cracks appear. Remove old caulk completely before reapplying.

Common Questions about Caulking the Backsplash

Here are answers to some frequently asked questions:

Should I caulk with grout or silicone?

Use 100% silicone caulk rather than grout. Silicone is more flexible and waterproof. Grout will eventually crack.

Where exactly should the caulk go?

Run a bead along the entire top seam where the backsplash meets the wall or countertop. Don’t caulk the bottom or vertical seams between tiles.

How long does caulk last?

With proper application, quality silicone caulk will last years without cracking or peeling. Check occasionally for gaps needing re-caulking.

What’s the best caulk color?

Use a caulk color that matches the grout for a seamless look. For white backsplashes, white or almond caulk blends nicely.


Caulking the top of the newly installed backsplash is a quick yet critical final step. Taking the time to properly caulk the backsplash ensures a water-tight seal that prevents costly moisture damage, creates a polished finish, and makes cleaning easier. Use a high-quality kitchen-grade silicone or acrylic caulk and tool it smoothly into the seam. Allow proper curing time before exposure to water. With the top properly sealed, the beautiful backsplash can be enjoyed without worry for many years. Be sure to caulk the top of your backsplash for best results!