How to Fix Crumbling Cement Foundation Walls

Written by jourdan townsend
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How to Fix Crumbling Cement Foundation Walls
Coloured cement block wall. (Grass from Cement image by Towards Ithaca from

Even if you cement foundation walls appear to be crumbling only on outside, this could be a sign that the structural integrity of your home or other building is in danger. Make sure you first have any damaged cement foundation walls examined by a professional. However, once a professional inspects your home and you know for sure that your crumbling foundation walls are only unsightly, patching the corroded areas yourself to make the foundation look new again is quite simple.

Skill level:
Moderately Easy

Things you need

  • Protective clothing
  • Safety goggles
  • Work gloves
  • Wire-bristled brush
  • Paintbrush
  • Spare cement blocks
  • Scrap lumber
  • Bucket
  • Paint stick or spade
  • Cement patch product
  • Water
  • Fine-mist spray bottle
  • Metal trowel
  • Heavy cling film

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  1. 1

    Wear thick shoes or steel-toe boots to protect your feet from falling chunks of cement, and put on a pair of goggles to protect your eyes and work gloves to shield your hands. Wet cement can stick to your skin and leave burns, so completely cover your arms and legs.

  2. 2

    Rub the crumbling areas with a wire-bristled brush to remove any loose pieces of cement. Brush the areas with a clean paintbrush and make sure that these areas are perfectly clean.

  3. 3

    Arrange two spare cement blocks tightly against the foundation, beneath the crumbling area. Lay a piece of scrap lumber atop these blocks, with no space between the foundation and the board. This arrangement will protect your lawn and other surfaces from falling concrete patch and will allow you to reuse that fallen patch.

  4. 4

    Use a paint stick or a spade to mix together in a bucket your cement patch product and the amount of water directed by the packaging of the particular product you have chosen.

  5. 5

    With a fine-mist spray bottle, spray the first area you want to work on with a bit of water. Apply a generous coat of cement patch with a metal trowel, building up the crumbling areas until they are even with the stable cement blocks around them. Use the trowel to scrape up any wet cement patch that falls onto the board below and reuse it as you go. Smooth the surface of the block with the trowel.

  6. 6

    Cure the cement patch for 2 hours. Rub the still-damp patched areas with the flat side of a piece of scrap lumber to give texture to the new cement so that it matches the cement block surrounding it. Gently cover the damp patched areas with heavy cling film.

  7. 7

    Allow the cement patches to cure completely for three days, then remove the cling film, spare blocks, and board.

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