Building a Form for Your Concrete Countertops

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Although concrete is most often used for driveways, carports, and sidewalks, it has become increasingly common inside the home as well. Concrete countertops are inexpensive to build, durable, and highly unique as fixtures in your home. Building concrete countertops in kitchens and bathrooms is a task that a large number of homeowners are taking on for themselves, without the aid of a contractor or professional.

Once you have determined the style, shape, and size of your concrete countertop, you can begin building a form in which to pour the concrete. Follow these steps for a successful concrete countertop form.

Collect Your Materials

The basic form structure should be 3/4-inch or 1-inch particleboard coated in plastic or melamine. Many workers find that a pre-made particleboard dresser or vanity can be helpful in providing the basic structure. Drywall screws will be necessary to secure the pieces of particleboard to support the drying concrete. Finally, foam pieces or plywood blocks will help to create a void for the sink in a kitchen or bathroom countertop.

Construct Your Base, Sides, and Top

Using drywall screws, attach the particleboards in the shape and design that you desire. Set screws every 4 to 6 inches for the best support. Be careful to include holes in the top of the form to accommodate faucets and water pipes for a sink. PVC pipe can be used to secure these holes during pouring.

Construct a Countertop Lip

Using foam or plywood pieces, build a lip on the outer rim of the countertop, if you desire one.

Ensure the Concrete Won’t Stick

Any surfaces that aren’t covered with vinyl or melamine should be coated in electrician’s tape or another non-stick coating, to ensure that the form will be easy to remove from the concrete once it has been set.

Create the Void for the Sink

Set a Styrofoam piece in place of the sink to create a void in the concrete. You can secure the Styrofoam piece with drywall screws to ensure that it remains stable while you pour the concrete.

If your concrete countertop form needs additional reinforcement, buttress the form with plywood pieces for support. Ensure that your form is sturdy enough to allow for ample setting and drying time. Additionally, any surface of the form that will come in contact with concrete must be non-stick for ease of removal after you have poured the concrete.

Once your concrete countertop form is built, you can begin to mix and pour the concrete of your choice. Consult a home improvement specialist with any questions or concerns before pouring your concrete.