The exterior walls around this particular basement are monolithic. The interior slab is floating and unreinforced. One half of the garage floor is the basement roof.

Figuring on at least a 10-11 foot trench alongside the basement wall, we're going to use 3/4" or 1" crushed, clean gravel to backfill over the perforated pipe, filter fabric to separate the gravel pack from the soil backfill, and compact. In addition, we'll be using Mira-drain, a bumpy plastic-backed filter against the wall, to provide drainage and aeration.