The best method for foundation repair is to replace the damaged section of foundation with a new piece of treated lumber.

There are a few different methods that can be used for foundation repair, depending on the severity of the damage and the type of foundation that is in use. One common method is to use piers or posts to support the foundation and keep it from sinking or shifting. Another method is to inject a liquid resin into the cracks in the foundation in order to fill them and reinforce the structure. A third method is to use a metal mesh grid system beneath the foundation to provide extra support. The best method for foundation repair will vary depending on the specific situation, so it's important to consult with a professional engineer or contractor who can assess the damage and recommend a solution.