Buy an inside closet flange. This toilet flange is designed to glue on the inside of the pipe or expand inside the pipe. Leave the old toilet flange right in place and glue on the new one at the right elevation for the floor, if it’s plastic.Click to see full answer. Similarly one may ask, does toilet flange need to be screwed to floor?5 Answers. The bottom of the flange needs to be sitting flush with (or not more than 1/8″ above) the finished floor or else the toilet will rock. The flange should be fastened to the floor. Dry fit the toilet to make sure it doesn’t rock.Also, how do I remove a closet flange? Remove Flange Use your putty knife to clean the wax from the flange. Remove the screws attaching it to the floor using your multi-head screwdriver. Clean off the flange and tuck an old rag into the sewage outflow pipe to block any unwanted sewer smells or gasses. Correspondingly, how do you secure a toilet flange to tile? How to Anchor a Toilet Flange in a Tile Floor Set your toilet flange into position on top of the tile with the back holes lined up parallel to the wall behind and the two slots parallel to the two walls on each side of the toilet. Locate and mark the areas where you will drill. Can you install a toilet without a flange?2 Answers. The flange and accompanying bolts hold the toilet firmly to the floor and keeps the seal between the toilet and the floor. Without the flange or if it is broken, he would have to attach the toilet to the subfloor with wood screws, and if the floor is rotting out, those won’t last long.