Original construction had a bathroom toilet flange installed flush to subfloor. Tile flooring was installed and toilet installed on top of tile flooring.
We are renovating the bathroom and when the toilet and flooring was removed, the flange was broken. So when we had a plumber in to give an estimate for replacing the flange, they said it needed to be raised to be flush with the new tiled floor, which meant cutting into the downstairs ceiling to gain access to the drain. I've had one other toilet installed in the past (different part of the country) and the flange was mounted flush with the subfloor and toilet installed on top of the tile just as it was originally done in the current house. It feels as if this plumber is trying to beef up the quote.
Is it necessary to raise the flange to be flush with the tile floor or is it satisfactory to just use a flange repair kit to flush mount to the subfloor?
You can use a flange repair kit. But what is better in my opinion, to raise the floor up, is a flange that fits inside of that flange. They sell it at home depot. It has rubber ribs on the outside of the pipe. You can't miss it.
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