How to Install Doorway Trim for Carpet on a Concrete Floor

By Kimberly Johnson

The piece of trim that sits under a doorway is called a transition strip and covers the edges where two types of flooring meet. In the case of carpeting, the strip also serves to hold it down to the floor. While installing a transition strip on wooden subfloors requires only a hammer, concrete floors present a challenge. Before you can install the strips on concrete, you must create holes in the concrete to secure the strip to.

List of Items Needed

  • Tape measure
  • Hacksaw or handheld multipurpose tool with metal cut-off wheel
  • Pencil
  • Safety glasses
  • Drill
  • Carbide-tipped drill bit
  • Compressed air
  • Plastic anchors
  • Hammer
  • Screws
  • Screwdriver
  • Construction adhesive
  1. Fold back the carpet under the doorway so that you can see the concrete subfloor. Measure the distance from each side of the door to determine the proper length for the strip. Measure the same distance on the strip and cut it down to size with a hacksaw or a handheld multipurpose tool with a metal cut-off wheel.

  2. Lay the strip in the doorway directly where you will install it. Insert a pencil through each screw hole to mark the locations on the concrete. Pick up the strip and set it aside.

  3. Put on safety glasses and insert a carbide-tipped drill bit into the drill. Create a 1-inch deep hole in each of the marked locations on the floor.

  4. Remove the cap from a can of compressed air and blow the sanding dust out of the hole.

  5. Place a plastic anchor into each hole and tap it gently with a hammer until it is flush with the surface of the concrete.

  6. Fold the carpet down into position, making sure it does not overlap the concrete holes. Place the transition strip on top of the carpet and align the holes in the strip with the ones in the concrete floor.

  7. Insert the provided screws through the top of each screw hole and tighten them with a screwdriver.

Tips and Warnings

  • If desired, you can also install the trim using a construction adhesive designed for masonry.

© Demand Media 2011