Abstract: A molded plastic system for use in constructing footings or supports for structures, preferably for supporting a deck. The system includes a base that includes a lower peripheral flange that extends in a substantially horizontal plane in use with the peripheral flange having an upper facing surface and a lower facing surface and an upright post that is integral with the base, extends upwardly from the upper facing surface of the base and is hollow to define a top opening of the base. The system also includes a column that includes top and bottom ends. The bottom end of the column is positioned in the base opening and extends in a generally vertical direction from the base. A cap includes a bottom end having an opening into which the top end of the column is placed for mounting the cap from the column. The cap further includes opposed side tangs that define therebetween an open channel for receiving a support structure.