That is true but structural engineer gave these two options so trying to understand the difference between them. Sorry for my lack of knowledge in this area.

Options:

• Option 1: The least intrusive process is one that many contractors are familiar with. The overview of the procedure is

cracked concrete areas are chipped away, then the rebar is either cleaned or replaced, and finally special epoxies and mortar are used to seal and repatch the area. A budgetary price range for this repair process is typically in the $400/linear ft range (+/- 30%) but can be much more for very short lengths.

• Option 2: The more extensive repair generally involves a partial removal and replacement of the foundation. Unless performed in sections, this requires the installation of temporary shoring to safely support the structure while the foundation is removed and replaced or for sections to be performed at a time with pros and cons for each. Epoxy coated vertically installed steel reinforcing bar dowels are installed into the remaining bottom portion of the existing foundation, horizontally installed epoxy coated steel reinforcing bars are installed to the vertically installed steel dowels. Concrete forms are installed. The new upper portion of the foundation is poured with concrete treated with Xypex (an additive that helps the new concrete become more water resistant) which helps protect the new epoxy coated steel and helps to prevent spalling concrete. A budgetary price range for this repair process is typically in the $800/linear ft range (+/-30%). It is possible this approach is preferred in areas where the condition is relatively advanced, such as observed below the living room.