How to Repair Cinder Block Foundations


Repairing a cinder block foundation is difficult, dirty and exhausting work. Although the steps are simple, the work is not. If this does not sound like your type of thing, call a contractor and save yourself the trouble. But if you are up to the challenge, follow the steps to repair the two most common problems -- a basement leak or a large crack.

Things You'll Need

  • Plaster premix
  • Trowel
  • Foundation tar
  • Drain tube
  • Premixed cement

Basement Water

  • Dig down to the building's foundation. Dig all the way to the bottom, where the foundation meets the earth.

  • Mix cement premix until it is sticky and runny.

  • Apply the mix to the outside portion of the cinder block wall, using broad strokes and a wide flat trowel. Apply it 1 inch thick, all the way from the base of the foundation to the place where the foundation meets the ground's surface.

  • Allow the plaster mix to set for two to three days.

  • Coat the dried plaster with foundation tar. Let it sit for another day or two.

  • Install a drain tube along the bottom of the foundation to catch water before it enters the basement.

Foundation Cracks

Tips & Warnings

  • If your foundation has a small crack in it, don't be alarmed. Just dab a little cement premix over it and forget about it.
  • If the crack in the foundation is more than an inch wide, call a contractor immediately. This could indicate that a corner of the foundation is settling.

Related Searches


  • "Successful Home Repair: When Not to Call the Contractor"; Gary Paulson; 1978
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