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How to Make Fake Rocks for an Outside Waterfall

By Lisa Wampler ; Updated September 21, 2017

Building a waterfall in your backyard can be a rewarding experience. The serenity of running water provides a calming effect for many people. Creating a functional waterfall that looks nice and does not break the bank will help you enjoy the final product even more. You can save money by molding your own fake rocks to create the base for the waterfall.

Line your concrete molds with the mold liners designed for the molds or with plastic wrap. This makes it easier to get the faux rock out of the mold once it dries. You can purchase molds in many different shapes and sizes at home and garden centers.

Mix ready-mix concrete in a wheelbarrow. Follow the mixing directions for the specific brand of concrete you purchase to ensure the correct consistency.

Mix in the concrete pigment to add color to your concrete. For example, if you want your stone to look like lava rock, you can add in a brick color pigment. Follow the dosing directions printed on the container of pigment to ensure you add the correct amount. The total amount will differ depending on how much concrete you mix.

Fill the mold with the concrete mixture and level the mold off with a trowel. Allow 24 to 48 hours drying time.

Flip the mold over in your hand and pull the concrete out of the mold. The concrete will hold the form of the mold.


Things You Will Need

  • Concrete molds
  • Mold liners or plastic wrap
  • Mortar
  • Concrete pigment
  • Trowel
  • Wheelbarrow