How to Use Trex Over Concrete


Trex is a brand name of plastic/wood composite building material that is commonly used for decks and other outdoor projects. Trex is typically fastened to a wood frame using treated deck screws. Attaching to concrete requires a stable material, such as wood. Using wood battens perpendicular to the Trex decking boards is the simplest way to make the attachment. Concrete screws allow the wood to be attached directly to the concrete.

Things You'll Need

  • Tape measure
  • Chalk line
  • 1-by-4 lumber
  • Miter saw
  • Drill
  • Rotary mason's bit
  • Concrete screws


  • Use a tape measure and chalk line to mark lines across the concrete every 24 inches, perpendicular to the direction of the Trex boards, to mark the positions for the wood battens.

  • Cut 1-by-4 lumber to the same length as the concrete, along the chalk lines, using a miter saw. Use a drill and 1/4-inch bit to drill a row of holes down the center of each batten, 24 inches apart. Align one 1-by-4 batten with each line so that the board is centered on top of the line.

  • Drill down through each pilot hole in each board with a 3/16-inch rotary mason's bit to a depth of 1/8 inch into the concrete to mark the concrete screw positions. Remove the boards and drill into the concrete 2 inches deep in each marked position.


  • Realign the battens with the pilot holes in the concrete. Drive one 2 1/2-inch Tapcon-style concrete screw through each hole in each board into the concrete beneath until the screw is snug and the head is flush with the surface of the board.

  • Position 8-foot lengths of Trex 5/4-by-6 decking boards in rows, perpendicular to the battens. Start along the outside edge, fitting boards in the first row end to end. Cut one board to fit at the end of the concrete, so that its end is flush with the edge of the concrete. Start the next row with the piece cut off the end of the first row to stagger the end joints of the boards between rows.

  • Space rows 1/8 inch apart and screw each board down with two 1 1/2 inch treated deck screws through each Trex board into each intersection with a batten.

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