How to Fix Cracking and Peeling Concrete Caulk

If the caulk in your concrete patio keeps cracking and peeling. You can fix your caulking for good by using this simple and professional method.

Remove The Cracking Caulk

The first thing you are going to need to do remove all the old, cracking caulking. The removal method depends on the type of caulking that is inside of your concrete. The most common types of caulking are latex, silicone or polyurethane. If you don't know what type of caulking is in your concrete, start with the latex removal method.

  • Latex Caulking RemovalTo remove caulking made of latex, you need to pour a caulking remover you purchased from your local hardware store. You will need to let it sit for a couple of hours. After the remover has sat for a couple of hours, use a putty knife to dig out the remaining caulking.
  • Silicone And Polyurethane RemovalFor silicone and polyurethane caulking, you'll need to purchase mineral spirits. Pour the mineral spirits on the caulking, and then remove it with a putty knife. If the caulking is difficult to remove, you may need to repeat this process. Make sure you remove at least the top inch of old caulking; you don't have to get all the way down to the bottom of the caulking, but you do need to remove the top inch.

Insert The Rod

In between each crack in the concrete, you need to insert a backer rod. You may need to use the putty knife to push the backer rod into the crack. The backer rod needs to be wide enough to fit in between the crack and fit tightly. The rod will help keep the new caulk that you apply in place. It will prevent additional cracking in the future.

Apply The Caulk

Once the rod is in place, you'll need to apply the caulking. Make sure the caulking is designed specifically for concrete. Carefully apply the caulking; make sure that you keep the beads of caulking smooth. You can use a plastic spoon to smooth out the caulking. Allow the caulking to dry according to the instructions on the package; don't walk on the caulking until that time has passed in order to allow it to cure properly. 

By removing all the old caulking and adding the backer rod when you apply the new caulking, you'll create a stronger surface for the new caulking. The new caulking should stay in place and should not crack. If you're looking to purchase concrete products, visit