How to Install a Backerboard Around Toilet Flange

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Installing backerboard around a toilet flange is a simple task, but it will take some time to do it correctly. Do not rush through it unless you have extra pieces of backerboard on hand. And do not be intimidated by the need to cut a round hole into a sheet of concrete backerboard: To get the hole in the right place, you will have to measure the placement of the hole on the sheet of backerboard after you cut the backerboard to fit the area around the toilet flange.

Things You'll Need

  • Backerboard knife or a utility knife Hammer Drywall shaver Tape measure Pencil

How to install backerboard around a toilet flange

  • Cut a sheet of backerboard to fit the area around the toilet flange. Test the fit before laying out the flange placement.

  • Lay the placement of the flange out on the sheet of backerboard using a tape measure and a pencil. Sketch a circle between the measurements.

  • Use a backerboard knife or a utility knife to score the backerboard around the sketched circle. Then score a pie-shaped pattern within the circle. Be sure you make the score lines deep.

  • Use a hammer to tap the scored wedges of backerboard out of the hole. Lay the backerboard on the floor to test the fit. Mark the places on the backerboard that need adjustment, and then use either a utility knife or a drywall scraper to remove the excess backerboard so the fit will be tight.

  • Screw the backerboard to the subfloor with backerboard screws and place at least four backerboard screws around the flange 1-1/2 inches from the edge of the hole.

Tips & Warnings

  • Make the backerboard fit around the toilet flange as tightly as possible.

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  • Photo Credit http://www.jameshardie.com/homeowner/popImages/backerboard_quarter.shtml
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