Step 8 · Secure the Flange to the Subfloor
With the flange sealed to the pipe, it must now be anchored to the subfloor. Position the flange so the closet bolt slots are parallel to the back wall. Use a drill with a small bit to drill pilot holes into the wood subfloor through the screw holes in the flange ring. Then, drive corrosion-resistant screws (stainless steel is best) through the flange and into the subfloor until the flange is held down firmly. This prevents the toilet from rocking and breaking the wax seal over time.