the stacking units 4 and footing units 6 may further include a water barrier 28 between the units the water barrier 28 may be in the form of a water proofing membrane fixedly attached to some or all of the outer surface of the units which will act to stop water infiltration between each of the units the membrane can act as a seal when the units are placed together and compression force is applied it is contemplated that one possible use for the assembly 2 will require it to be at least partially below ground and the water barrier 28 will help prevent ground water from seeping between the below ground units to use the assembly 2 the necessary size of the assembly 2 must be determined including any height and diameter requirements or restrictions generally for each column or deck footing required a contractor will procure the appropriate size and number of stacking units 4 and footing units 6 so that once assembled the assembly 2 will be of correct height for the deck footing or other structural requirement next the contractor will procure one threaded flat metal plate 40 one nut 20 one washer and one rod 30 for each assembly to be assembled the rod 30 sized to be a few inches.