- Clean out any loose particles from inside the crack. Many times, when a foundation cracks, small pieces will remain in the crack. This must be removed in order for the repair to be effective. Use a brick chisel and a hammer to remove any excess material from the crack. A stiff-bristled brush will work well for sweeping out any excess materials. Clean the crack out with a water hose.
- Mix Portland mortar together with sand--you can follow the instructions on the bag for mixing directions. Otherwise, you can use a wheelbarrow and a hoe for mixing the mortar and sand at a 2-to-1 ratio: two parts sand to one part mortar. Add the sand first--this will prevent the mixture from lumping in the bottom of the bucket. Add the mortar, and mix vigorously until you have a mixture that is somewhat sticky and will remain on the trowel without falling off.
- Moisten the crack with the water hose. If the crack is dry, then the mortar may not bond effectively. The water will allow the mortar to be pulled into the pores of the foundation. Pack the mortar into the crack, using the small pointing trowel. Using the back of the trowel, take the mortar from the bucket and force it into the crack. You may need to pack a large amount into the crack before it fills. Repeat this on the back side of the foundation as well. Smooth the mortar with the trowel, and make sure that any excess mortar that is hanging is cut off even with the foundation surface. Allow the patch to dry over the next six to eight hours. Keep the patch moist for the next two days so that is doesn't dry out too quickly and crack.You may also use an epoxy or urethane injectable concrete repair kit. These are very effective in eliminating water infiltration and are relatively easy to use.
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