I am building a detached 30x40 ft single story garage/office structure. From the front of the planned structure to the rear, the grade slopes about 18 inches.
What is the best site prep and foundation for this structure and grade ? I've had two different contractors suggest different methods.
1. Build a retaining wall and back fill it to a level grade, then pour a monolithic slab foundation with proper footings, building the structure directly on the slab.
2. Build a concrete block foundation wall. Then backfill and pour a concrete floor to the wall, buidling the structure on the foundation wall.
Are either of these methods better than the other, or is there a third option ?
Ann Arbor, MI
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