Just moved in and the basement toilet sat up too high and therefore rocked so I took her out. Flange was rotted and broken so I took her out. Couldn't find any male flange to fit so I am using cast iron outside fiiting flange. Ok so I have chipped away at the slab floor until the flange is flush. Do I need to fill with cement and if so what kind? Would I also need to set flange mounting screws in the wet cement to avoid drilling into new possibly fragile concrete?
Thanks for any help