What is strap footing?
Strap Footing
You have to use cantilever or strap footings when the proximity of a property line precludes the use of other types for example an isolated column footing may be too large for the area available and the nearest column may be too distant to allow a rectangular or trapezoidal combined footing to be economical. The strap footing may be considered as two individual column footings connected by a strap beam.