Q:

How do I do concrete block foundation repairs?

A:

Quick Answer

A common repair done with a concrete block foundation is to replace loose or missing mortar with new material. The process requires safety equipment, hand tools, mortar mix and a sealant. Wear safety goggles for eye protection.

Continue Reading

Full Answer

  1. Remove damaged mortar

    Use a cold slim chisel and a hammer to remove the loose or damaged mortar from between the blocks. Chip away at the damaged areas until clearing a 1/2-inch deep space between the blocks in the damaged area. Brush the cleared mortar lines with a wire brush to remove any remaining loose debris.

  2. Mix the repair mortar

    Mix a batch of repair mortar in a large bucket by combining one part masonry cement with three parts fine sand. Add water to the dry mix, while stirring it with a trowel, until the mixture is a thick paste about the consistency of oatmeal. Make the mixture slightly dry, so that it is easy to work with and sticks to the blocks well.

  3. Prepare the block joints

    Wet down the joints between the bricks where the old mortar was removed using water and a brush to force the water onto all joint surfaces. This removes any remaining dust and keeps the existing mortar from drawing out the liquid contained in the repair mortar.

  4. Fill the joints

    Use a pointing trowel to force the repair mortar into the joints between the blocks. Fill the joints completely, and then scrape a brick jointer along the top of the new mortar in the joints to remove enough excess mortar to make the new mortar level equal to the older, undamaged mortar surrounding the blocks. Begin with the vertical joints, filling them before moving on to the horizontal joints.

  5. Seal the mortar

    Wait two weeks after applying the repair mortar, then spray a coat of high-quality masonry or acrylic sealant over the joints and the blocks. The sealant protects the new mortar from water damage.

Learn more about Building Materials
Sources:

Related Questions

  • Q:

    How long does it take for mortar to dry?

    A:

    Different jobs require unique types of mortar, each of which may have a distinct drying time. For example, thin-set mortar used for tiles and counter tops requires 24 to 48 hours to dry while brick mortar made from Portland cement can require up to 28 days to dry.

    Full Answer >
    Filed Under:
  • Q:

    What is the ratio to mix mortar?

    A:

    The ratio to mix mortar is historically accepted as 1:3 of sand and cement. Mortar is a mixture of cement used in the building trade to hold bricks together.

    Full Answer >
    Filed Under:
  • Q:

    How do you install glass blocks?

    A:

    To install glass blocks, make a frame for the blocks out of 1-by-6-inch lumber, mix glass-block mortar, spread the mortar on the bottom and sides of blocks, and install a layer of blocks from one corner of the frame to the other. Add more mortar, a metal retaining strip and additional layers of blocks.

    Full Answer >
    Filed Under:
  • Q:

    How do you lay crazy paving?

    A:

    To lay crazy paving, remove the topsoil, add hardcore fill and sand, flatten the ground, mortar and lay the paving stones, and mortar the joints. To undertake this project, you need a shovel, hardcore fill, sand, water, a mallet, a lawn roller, mortar, a trowel, a level and paving stones.

    Full Answer >
    Filed Under:

Explore