Corrugated metal is a repeat offender in many modern homes. Architects love it for its affordability, availability, and durability. - Diana Budds's Material Focus: Corrugated Metal design collection on Dwell.
In moderate climates like SF the vertical insulation below the slab insulation is not required.
Newer Metal Building in a good location with Hwy frontage on both sides. Slab foundation and about 3,200 + Sq. Ft. currently a store business ( refrigeration equipment included) + An additional 30X40 older building and all sitting on about 7 Acres with Highway frontage. Call for more details in Lebanon MO
concrete slab foundation shed plans
Slab Foundation Settlement Repair - Foundation Technology