How to Rough Measure for the Plumbing of Toilets

How to Rough Measure for the Plumbing of Toilets thumbnail
Rough measuring for a toilet takes just minor skills and a little patience.

If you are building a new bathroom, or planning a new home, you're responsible for the installation of the toilet plumbing fixtures, including the drain and water lines. Drains usually install right in the bathroom floor, so you only have to be aware of one measurement, the distance from the wall. Your plumber will rough in the water feed lines, including the one for the toilet. So, use some standard measurements as a guide to rough in your new toilet fixture. Does this Spark an idea?

Things You'll Need

  • Tape measure
  • Pencil
  • Ruler
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Instructions

    • 1

      Remove all of the items from the bathroom including spare boards, boxes or pieces of furniture to clear a space for your measurements.

    • 2

      Measure the distance from the back wall to the center line of the drain. The center line is the center of the drain opening. Mark this location on the floor with a pencil and ruler. Only measure from the wall itself, not the bare studs and not the molding.

    • 3

      Measure 16 inches perpendicular (at a 90-degree angle) from the center line mark in each direction and make a mark. This gives you 16 inches of space on each side of the toilet. If you do not have 16 inches on each side, move the center line mark one way or the other to allow enough room.

    • 4

      Redraw the center line mark once you have established space on each side of center line. This is the center of the drain.

    • 5

      Measure up 8 to 10 inches on the wall directly behind the toilet and make a mark for the water inlet. This inlet can go anywhere near the toilet, but typically is located 8 to 10 inches from the floor. Check your local building and plumbing codes to be sure your measurement meets your local codes.

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References

  • Photo Credit Thinkstock/Comstock/Getty Images

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