Types of footing and footing size calculation

Combined footings

These types of footings generally provide support to two columns or three columns not situated in a row. Combined footings are useful when two columns are so adjacent that it becomes impossible to apply single footings or when one column is situated at or adjacent to a property line.

Continuous footings

These types of footings provide support to a row of three or more columns. They contain limited width and extend under all columns.