If the weight of the finished stone is a consideration, the addition of perlite, pumice and peatmoss into a concrete mix reduces weight.
You can also add a styrofoam core without compromising the strength and durability of the stone. The procedure is simple.
Foam Core Stepping Stones
- Size a 1/2″ sheet of styrofoam to fit inside mold, leaving a minimum 1″ between inner wall of mold and circumference of styrofoam.
- Wrap styrofoam with a sheet of nylon fiber or wire mesh. This will help strengthen the finished stone.
- Fill mold with approximately 1/2″ – 3/4″ of concrete; tap lightly to remove air bubbles. Place styrofoam on top of concrete, then pour additional concrete to cover styrofoam. Fill to top, shake lightly to level concrete.
- To prevent styrofoam from floating to the surface, cover concrete with a sheet of plastic, then place a brick or stone in the middle of the mold. This will hold the foam in place.
Place styrofoam on top
of concrete
Pour additional concrete
to cover styrofoam
Fill concrete to top of
mold