How to DIY a Concrete Backsplash

Before applying concrete to your walls, take some time to protect nearby surfaces from concrete splatters. An easy way to do this is to grab some painter's tape and a few trash bags, then tape the bags over the surface you want to protect, taking care to tape down the area where the countertop meets the wall. 

But if you get some concrete splatters on areas you didn't intend to, don't panic—it's typically pretty easy to chip these away once the concrete is dry.

After prepping your room for the project, it's time to apply the waterproofing membrane. This step will help the concrete adhere to your walls and prevent it from cracking in the future. Use a paint roller to apply a thin, even layer over the area where you plan to apply concrete. 

Once you've applied the membrane, let it completely dry before moving to the next steps. This typically only takes a few minutes, but check the manufacturer's recommendations to verify the drying time.

Once your membrane is dry, grab your mixing tray and stick and mix your concrete using the concrete-to-water ratio recommended by the manufacturer. If you decide to include color additives, now is when you'll mix them in. 

Make sure to complete this step right before you plan to apply the concrete, so it doesn't dry before your application.

Next, dip your 6-inch drywall knife into the concrete mix and put on a generous glob of concrete. Then scrape it onto the wall at a 45-degree angle, creating a thin, even layer. Repeat this process until you've covered the entire backsplash in a first coat. You can use your putty knife for minor details and cracks, like where the backsplash meets the countertop. 

Don't worry if it's not completely even—subsequent coats will help even it out.

After your first coat dries, use the same process from the previous step to apply a second and third coat, making sure to let the concrete dry between coats. If there are still some uneven areas after the third coat, you can apply another coat to even it all out. Let your final coat dry before proceeding to the next stop.

Once all your concrete coats are dry, and you're happy with the look, apply a thin layer of the acrylic concrete sealer over the entire area. Pay special attention to the edges where the concrete meets your counter. This type of concrete sealer will help prolong the lifespan of your new backsplash, preventing future cracks and chips.