How to Fix a Leak in Concrete Roof with Paint


Fixing a leak in a concrete roof can be a frustrating endeavor. However, before you call an expensive contractor, you can fix the roof yourself by using concrete patching to fill the leak, and latex primer and paint to permanently seal the surface. However, before you get started, you need to know the proper surface-preparation techniques and the appropriate application methods that will help you achieve success.

Things You'll Need

  • Razor blade
  • Tube of concrete patch
  • Pressure washer
  • Caulking gun
  • 3- to 5-inch-wide metal putty knife
  • 3 to 4 inch paintbrushes
  • Paint roller frame
  • Nap roller cover
  • Extension ladder
  • Latex primer
  • Latex paint
  • Access the roof with an extension ladder.

  • Cut the tip from the tube of concrete patch. Load the tube into the caulking gun.

  • Apply concrete patch to the leaking areas of the roof. Smooth the patch with a 3- to 5-inch-wide metal putty knife. Work quickly before the patch has an opportunity to dry.

  • Allow the patch to dry for one full day.

  • Clean the surface of the roof with a pressure washer. Allow the surface to dry before continuing.

  • Pour primer into the 5-gallon bucket. Fill it about halfway. Attach the nap cover to the frame.

  • Apply primer to the concrete roof using the roller, effectively sealing the patches. Begin at one far end and work backward toward the ladder. Allow the surface to dry for two full hours.

  • Apply paint in the same manner as you did the primer.

Tips & Warnings

  • Falls from extension ladders can be fatal. Always follow the instructions printed on the side of the ladder exactly.

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