How to Seal Concrete Block Walls

Written by paul ramone
  • Share
  • Tweet
  • Share
  • Pin
  • Email
How to Seal Concrete Block Walls
Properly seal your concrete block wall (cold concrete blocks image by jbattx from

A concrete block wall is an investment that you want to keep protected so that it lasts a lifetime. While not indestructible, a sealed concrete wall is capable of standing up to harsh weather for many years. Unfortunately, without a proper seal, water can penetrate the concrete and slowly break it apart, especially in regions of the world where the temperature drops below freezing. Seal your concrete block wall and improve its longevity.

Skill level:

Other People Are Reading

Things you need

  • Wire brush
  • Wood
  • Concrete sealant
  • Paint tray
  • Paint roller
  • Paint brush

Show MoreHide


  1. 1

    Remove dirt and debris from the face of the concrete block wall with a wire brush.

  2. 2

    Insert a spare piece of wood or paint stirrer into the concrete sealer and slowly stir to achieve a uniform consistency.

  3. 3

    Slowly pour the concrete sealer into a paint tray.

  4. 4

    Apply the sealer directly onto the face of the concrete blocks using a paint roller. Aim for a single, even coat of sealer on every visible part of the wall.

  5. 5

    Apply the sealer to hard-to-reach places using a small paintbrush. After the sealer has dried for 24 hours, apply a second coat to fully seal the concrete.

Don't Miss

  • All types
  • Articles
  • Slideshows
  • Videos
  • Most relevant
  • Most popular
  • Most recent

No articles available

No slideshows available

No videos available

By using the site, you consent to the use of cookies. For more information, please see our Cookie policy.