Monolithic Installation

Build your mold using plywood braced in place with 2-by-4s. Create a mold that the concrete can be poured into, with as few seams and joints as possible. Any impression on the inside of your mold will be transferred to the surface of the concrete you will pour into it, so ensure the inside surfaces are as finished and as smooth as possible. The grain of your wood will also be transferred, which can later be covered with a thin layer of plaster, but as much attention as possible should be paid while creating the mold, as wood is far easier to work with than hardened concrete.

Mix your concrete according to the specific manufacturer's instructions. While doing this, gently wet the inside of your mold with a garden hose.

Pour concrete into your mold. At this point, if you wish to add re-bar to your monolithic construction, pour a small amount of concrete into the bottom of your mold, then lay your re-bar, tied together with galvanized wire, into the wet concrete before pouring more concrete on top of it, permanently embedding it into the concrete to help add tensile strength to your construction. See your local building code for information on the quantity and interval of re-bar placement.

Let the concrete cure. Determine the appropriate length of time to allow before removing the framework, according to the manufacturer's directions and the quantity poured.