The patio area pictured is showing seperation from foundation and settling (about a 1-1/2" drop) due to the flatwork not being properly attached to slab foundation. Steel reinforcement in the patio was apparently not doweled into the slab foundation and no expansion joint was installed. The large gap between the patio and foundation  should be filled/ sealed to cut back on water penetration and other infiltrations.

Photos by JWK Inspections