Asked on Apr 27, 2017

How can I fix Cracks in Cinder block foundation?

Diana DeileyRodger TuckerGail


I have found some cracks that run mostly between between the cinder block foundation (a couple blocks have a crack in middle). What do I do to fix this and anything to watch out for?
5 answers
  • Judy Ferrell
    on Apr 27, 2017

    Go to the This Old House website. They will give you the best information.
  • William
    on Apr 27, 2017

    You may have a structural or settling problem. You can seal the cracks with colored silicone caulk. If the cracks come back you have a problem that needs to be addressed.
  • Gail
    on May 12, 2017

    A house trailer hit the edge of my block breaking it off. I used a can of concrete compound and iced it like a cake until you could not see the cracks and eventually modeled it to replace the broken part. That was about 20 years ago. It is still standing and although not perfect, no one would know it if I did not tell them.
  • Rodger Tucker
    on May 14, 2017

    Drill a small hole / holes in the crack large enough to accept the tip of a caulking gun.Fill those cracks with a specified caulk type for the job.
  • Diana Deiley
    on May 14, 2017

    Mike Holm's Junior had a show with a similar problem in his basement during his home renovation and how he resolved it. Do you have water in your basement? How wide are the cracks? larger than the width of a quarter? Google Mike Holms. Or ask Tom Silva on This Old House.
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