I have a building that I'm converting into living space for rental units. The building is on a cement slab foundation and to bring it up to code, I need to install foam board insulation around the entire exterior perimeter of the slab 3 feet deep.
My issue is I'm not sure what is the best/safest way to dig around the entire perimeter of the building.
- Is it feasible to dig it by hand?
- Is it dangerous for me to excavate the entire perimeter at once?
- Are there any tools than could help with the job?
I considered an excavator, however, one entire wall of the building is covered by an awning, which wouldn't allow for the excavator. There is also some cement I will have to bust away to get to the dirt.
Any advice would be helpful.