How to Regrout a Kitchen Backsplash

Grout is the unsung hero of your kitchen backsplash, acting as a crucial barrier against moisture and food splatter. Over time, however, this cement-based material can crack, stain, or crumble, leaving your wall vulnerable and your kitchen looking tired. Neglecting these small gaps invites water to seep behind the tiles, potentially causing damage to the wall substrate underneath. Refreshing your grout is a manageable project that yields high-impact results for minimal investment. Success depends on the quality of your removal work—if you do not take the time to clear out the old grout, the new layer will not adhere properly and will likely crack within a few months. When done well, your backsplash will look brand new, with crisp lines and a professional finish that protects your home for years to come.

1. Protect Everything First. Remove all items from your countertops and lay down heavy-duty plastic drop cloths to protect the surfaces below the backsplash. Use painter's tape to mask off the edges of your countertop and any adjacent cabinets to keep them clean during the removal process.
2. Excavate the Old Grout. Use a carbide-tipped grout saw or an oscillating multi-tool with a grout removal blade to carefully cut away the old grout. Aim to remove at least two-thirds of the depth of the tile to ensure the new grout has enough surface area to grip.
3. Clear Dust and Debris. Use a shop vacuum with a brush attachment to remove all loose dust and grit from the joints. Once the dust is gone, wipe the backsplash down with a damp sponge or a mixture of isopropyl alcohol and water to remove any lingering soap scum or grease.
4. Get the Consistency Right. Mix your new sanded or unsanded grout in a small batch according to the manufacturer's instructions. The consistency should resemble smooth peanut butter; if it is too runny, it will slump out of the lines before it cures.
5. Force Grout Into Joints. Use a rubber grout float to push the grout into the joints at a 45-degree angle. Ensure the material is packed firmly and uniformly into every gap, holding the float at a steep angle as you go to wipe away excess from the tile faces.
6. Perfect the Joint Lines. Once the grout has firmed up slightly—usually after 15 to 20 minutes—use a damp, clean sponge to wipe the tiles in a circular motion to shape the joints. Rinse the sponge frequently in clean water, keeping it slightly damp rather than soaking wet, to avoid pulling grout out of the gaps.