How to Make a Base for Oval Glass Coffee Table

Concrete casting techniques allow you create a dramatic double column base for an oval glass coffee table. Corrugated cardboard boxes, found at packaging and moving supply stores, and inexpensive plastic bowls are used as casting forms. In addition to their use as table bases, the weatherproof concrete columns can support birdbaths or sundials for striking additions to the garden. By mixing the concrete with peat moss and vermiculite, a lightweight hypertufa stone is created for the columns.

20-lbs. Portland cement
20-lbs. peat moss
20-lbs. vermiculite
Wheelbarrow
Trowel
Two 10-inch by 6-inch by 6-inch corrugated cardboard boxes
Plywood sheet
Duct tape
Concrete release spray
Four 12-inch diameter plastic bowls
Epoxy glue

Instructions

- 1
  Mix 20-pounds of Portland cement, 20-pound of peat moss and 20-pounds of vermiculite in the wheelbarrow with the trowel. Add water, one cup at a time, and mix until the cement is the consistence of oatmeal.
- 2
  Open one short side of one cardboard box and remove the flaps with the craft knife. Attach the short side of the box to the plywood sheet with the duct tape. Repeat with the remaining cardboard box.
- 3
  Fill the boxes with the cement mixture and smooth the top edges with the trowel.
- 4
  Spray the plastic bowls with the release spray. Fill the bowls with the concrete mixture and smooth the top with the trowel.
- 5
  Dry the cement for 48 hours. Rip the cardboard from the columns and pull the cement from the bowls.
- 6
  Attach the bottom of one bowl-shaped cement form to the end of one cement column with the epoxy glue. Attach the bottom of the remaining bowl-shaped form to the opposite end of the column.
- 7
  Attach the bowl shaped forms to the remaining cement column. Let the glue dry for 24 hours. Place the columns side by side under the oval glass to complete the coffee table.

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