How to Drill Plumbing Holes for TJI Floor Joists


TJI floor joists are a manufactured "I" joist widely used in residential and light commercial construction as a pre-engineered replacement for common dimension lumber. Once the TJI floor joists have been installed, the plumbing supply and drain lines can be run within the joist space. Cutting the needed holes is a simple procedure.

Things You'll Need

  • Tape measure
  • Compass
  • Electric drill
  • 3/8- or 1/2-inch wood bit
  • Jigsaw or reciprocating saw
  • Mark the center point of the desired plumbing hole on the side surface of the TJI floor joist's vertical web. Refer to the manufacturer's specifications to ensure compliance with the structural limitations regarding cutting and penetration of the joists.

  • Scribe the outside diameter of the hole using a compass. Measure the outside diameter of the plumbing piping and add approximately 3/8 inch to determine the diameter of the hole.

  • Drill a 3/8- or 1/2-inch hole at opposing sides of the hole's diameter just inside the scribed line using an electric drill with a wood boring bit.

  • Cut out the plumbing hole in the TJI floor joist using a jigsaw or reciprocating saw.

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