How to Fill the Gap Between Granite Countertop and Backsplash

Choose the Right Caulk

Using the right caulk is key to get a clean finish. For a granite countertop and backsplash:

  • Use 100% silicone caulk – it has excellent adhesion power and flexibility to handle the expansion and contraction of the two surfaces.Latex or acrylic caulks won’t last.
  • Get color-matched caulk – match the caulk color to your grout or granite color for a seamless look.
  • Ensure it’s mold-resistant – bathrooms are prone to moisture so get a caulk designed to prevent mold and mildew growth.

Popular options: GE Silicone II, DAP Dynaflex Ultra, Gorilla Silicone Sealant.

Prepare the Surface

Proper surface prep ensures maximum adhesion:

  • Clean the gap thoroughly – use a non-abrasive cleaner and microfiber cloth to remove all debris, dirt, oil, and old caulk.
  • Dry the gap – use a hair dryer or give it 24 hours to completely dry.
  • Use caulk-release tape – apply painter’s tape along the countertop and backsplash edges for neat caulk lines.

Apply the Caulk

Applying the caulk properly is key for great results:

  • Load caulk in caulk gun – cut the nozzle at a 45° angle for optimum bead size and control.
  • Fill the gap with caulk – hold the gun at 45° and apply steady pressure on the trigger, no gaps.
  • Tool the caulk for a smooth finish – use a caulking tool, popsicle stick or finger dipped in water.
  • Apply in one continuous motion, no stops and starts.

Finish and Maintain

Finishing touches for a clean install:

  • Remove the tape after smoothing the caulk, before it dries.
  • Seal corners with a fine-tip nozzle for a detailed finish.
  • Let it cure completely, usually 24-48 hours before wetting.
  • Recaulk yearly – check for gaps or cracks annually and reseal as needed.
  • Use a mold-resistant silicone – bathrooms need frequent recaulking.


Should I use caulk or grout between granite and backsplash?

Use caulk as it remains flexible to handle movement. Grout will crack. Silicone caulk is ideal.

What color caulk should I use with a granite countertop?

Use a caulk color that matches the granite or grout. A clear or white caulk will stand out. Colored silicone caulks blend better.

How long does caulk between granite and backsplash last?

With proper application, quality silicone caulk will last 2-5 years on average. Frequency of wetness impacts longevity. Recaulk annually.

What’s the correct caulk for a bathroom with granite counter and tile backsplash?

For a bathroom, use a mold and mildew resistant silicone caulk. GE Silicone II works well. Match the caulk color to your grout.

Should I caulk granite to granite?

Yes, always caulk between granite countertops since granite slabs rarely fit together flush. Use silicone caulk in a matching color for best results.

What is the smallest gap that needs caulking?

Gaps 1/16 inch or larger should be caulked, especially between two dissimilar materials like granite and tile. Small gaps can attract dirt and moisture.


Filling the gap between granite countertop and backsplash not only enhances the visual appeal of your kitchen or bath but also prevents problems like water damage, mold growth and trapped debris. Pay attention to properly cleaning, drying, and taping off the caulking area before sealing with a quality silicone caulk in the right color. Take care to smoothly apply the caulk and neatly tool it. Proper caulking can protect your beautiful granite and tile surfaces for years before needing to recaulk. With this helpful guide, you can confidently caulk the gap like a pro.