How to Paint Concrete Block Walls

Written by laurie brown
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How to Paint Concrete Block Walls
Paint concrete block walls to seal them against the elements and add colour to your property. (concrete wall image by bayu harsa from

Applying paint to a concrete exterior wall of your home will not only add beauty for years to come but will add to the overall value of your home as well. Use a base primer and top it off with an elastomeric paint to help your paint job last for many years. The elastomeric paint will help seal the concrete and resist fading or wear from the outside elements longer than a standard oil-based paint.

Skill level:

Things you need

  • Pressure washer
  • Hose
  • Caulk
  • Concrete patch repair
  • Putty knife
  • Concrete primer
  • 1 bag of paint rollers
  • Extension pole
  • Paintbrush
  • Elastomeric paint
  • Mineral spirits

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  1. 1

    Connect the water hose to the pressure washer machine and turn the water on. Start the pressure washer, following the manufacturer guidelines for your particular pressure washer model. Wash the entire area of concrete block that is to be painted. Use the pressure washer to clear away any loose paint, caulk or concrete from the wall. Allow the wall to dry for a couple of days.

  2. 2

    Use caulk to fill in any gaps or crevices around pipes or wiring in the exterior of the concrete block wall. Allow the caulk to dry overnight so it is able to fully cure before painting.

  3. 3

    Apply the ready-mix concrete patch to any holes or cracks in the concrete block walls. Allow the patches to cure overnight before painting.

  4. 4

    Apply one to two coats of primer to each exterior concrete wall, allowing time for the primer to dry between coats. Begin at one corner and work toward the opposite corner, using the rollers to spread even coverage of paint over the wall. Screw the extension pole into the end of the roller handle to help reach the high places on the wall. Use the paintbrush to reach small places or trim around windows. The primer will help seal the concrete and prevent any moisture from absorbing into the wall. Allow the primer to dry overnight before applying the paint.

  5. 5

    Apply one coat of the elastomeric paint to the exterior concrete block walls. Use the roller to apply an even coat of paint across the wall. Allow the first coat of paint to dry overnight and, if needed, apply a second and third coat to achieve a clean finish. Use the brush to trim around windows or ledges.

  6. 6

    Use mineral spirits to clean the brush and rollers, as well as any paint drips in unwanted areas.

Tips and warnings

  • Pressure washers can be rented from your local hardware store. Explain the use of the washer to the rental agency to help them determine which pressure washer is best suited for your project.
  • Avoid direct inhalation of the paint, primer or mineral spirits.

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