- 1). Draw perpendicular lines from two walls to the center of the flange, using a carpenter's square and a pencil. Measure the length of each line, and the distance from the point of intersection on each wall to the corner, using a tape measure.
- 2). Transcribe the measurements onto a sheet of plywood flooring, then make a mark denoting the center of the flange. Measure the flange's diameter, and draw a circle on the plywood that's 1/2 to 3/4 inch larger in diameter, and centered on the mark.
- 3). Drill a hole in the outline of the circle with a 3/8-inch drill bit, then insert the blade of a jigsaw through the hole and cut around the outline. Remove the cut-out circle, then set the plywood into place around the flange. The entire outline of the flange should be visible.
- 4). Attach the plywood to the floor in the same way you're attaching the rest of the flooring--with nails, screws or glue.
- 5). Measure the distance from the top of the flange to the top of the flooring. If the flange is more than 1/4 inch lower than the flooring, install a flange extender to bring the flange to just below floor level.
- 6). Remove the screws holding the old flange to the floor, then place the extender on top of the flange. Rotate the extender until the slots for the closet bolts and the screw holes are exactly aligned. Drive the flange screws back into the sub-floor.
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