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Toilet flange is too low and needs a flange extender. Should it be installed after the subfloor ( the layer under the cement board for the tiled floor) is in place since it needs to be fastened into the subfloor?

  • I would just install the extender after the final flooring is in place since then you'll know how high it needs to extend. – Sam Aug 16 at 18:34
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I'd install it after all the flooring is complete so you know exactly how much you need to extend.

You could use one of these extension kits and a wax ring once you know how much of a gap you need to fill. I don't like that the extender reduces the i/s diameter of the toilet drain. I avoid those wax rings with the plastic funnel/flange embedded in them for the same reason. I may just be superstitious, but I don't want to do anything that might restrict flow in that situation...

In stead of a flange extender, these kind of extended seals are also available. I don't have much first-hand experience with them, but I did use one similar to this (if not identical...I don't remember the brand..) a couple of years ago when replacing a toilet on a tile floor in my new house. So far, so good.

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