How to Make A Concrete Curbing Mold

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Concrete is used in many different areas throughout a home, ranging from steps to patios to basement slabs to driveways and shower pan floors. Curbs are most commonly used in bathroom settings, where they create a barrier between the shower floor and the rest of the bathroom, and are designed to be covered with a finish material. There are many different ways of building a curb, one of which is to pour it out of concrete. To do that, you must first build a curb mold to hold the concrete in place while it dries.

Things You'll Need

  • Tape measure
  • 2-by-4-inch or 2-by-6-inch material
  • Compound miter saw
  • Safety glasses
  • Drill
  • 3-inch wood screws
  • Framing square
  • 2-foot level
  • Concrete
  • Measure the width of your shower opening or the place where you want to install the curb. Decide if you want to have a 4-inch-high or 6-inch-high curb and use the appropriately sized wood. Mark two pieces of 2-by-4-inch or 2-by-6-inch material, which serve as the front and back sides of the curb form.

  • Cut your wood pieces with the miter saw. Place a piece of wood onto the miter saw and hold it flush against the fence (the back part of the tray) as well as firmly against the tray. Hold it with your off hand and then use your main hand to pull the trigger of the saw while also pulling the blade handle down into the piece of wood along your cut mark. Repeat the process for the second piece.

  • Decide how wide you want your curb to be and place the two pieces of wood that distance from each other, standing up on edge so that the walls (front and back pieces) are either 4 inches or 6 inches in height.

  • Connect the two pieces together at the determined width with two or three cross braces nailed into the top. Cut strips of wood down to fit across the width of the top with the miter saw. Screw them into the top of your frame to brace it at the ends and in the middle. Use the framing square as well as a 2-foot level to make sure your walls are plumb and square with each other.

  • Set the curb in place where you need to pour the concrete. Insert screws along the bottom edge of the curb, angled in from the outside and going in slightly through the bottom of the wood frame on the outside of the frame. This will hold the frame in place while you are pouring the concrete. Then pour your concrete inside the mold, wait 24 to 72 hours and remove the frame.

Tips & Warnings

  • Very few curbs go higher than 4 inches. Unless you are someone who enjoys high steps, the most common way to build a curb is with two-by-fours set on their side for the curb height. You can use 2-by-6-inch pieces if you prefer higher, or use the extra depth to make your own custom height, like 4.5 inches.
  • The ends of your curb are blocked by the walls of the shower, or the doorway you are installing the curb in. You do not need to cut wood to form the ends of the curb, as the walls or framing of the shower opening will serve as the blocks on the end while the concrete dries.
  • Wear safety gear when working with power tools

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