Create a concrete countertop by building a form to match the counter's desired dimensions and adding mesh reinforcement before pouring concrete into the form. You need melamine-coated particleboard, caulk, painter's tape, concrete, steel mesh, a float and a trowel; each countertop also takes two to three days to cure.
- Measure the dimensions of the counter
Measure the length and width of the counter. Note the measurements for any special features, such as a sink or faucet.
- Build the form
Use melamine-coated particleboard to build the form. Seal any cracks in the edges of the form by filling them with caulk. Place painter's tape over each bead of caulk, smoothing it out before removing the tape.
- Pour the concrete
Mix the concrete until it is neither too runny nor too thick. Incorporating the right additives into the mix at this stage can help prevent cracking and shrinking. Pour the concrete into the mold, filling it half full. Add steel mesh reinforcement on top of the concrete, and continue to fill the mold to the top. Run a float over the top of the concrete to level it. Tap the sides and shake the mold to remove any air bubbles. After the concrete has had a little time to set, use the trowel to smooth it out completely.
- Allow the concrete to cure
Place a plastic sheet over the top of the concrete, and allow it to dry for a few days.
- Finish the countertop
Remove the form, and place the countertop onto the counter. Apply a concrete sealer or food-safe polyurethane.