Thread: Moving toilet
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Unread 12-07-2019, 10:19 AM   #2
Carbidetooth's Avatar
Join Date: Mar 2010
Location: Boise, ID
Posts: 1,546
I wouldn't want to fill that leave-out with concrete unless there was no other choice. Type N or S mortar could be packed into void after some wet sand.

To figure finish height of vertical pipe, put toilet flange on temporarily and slide tile and whatever underlayment under edge of flange. Measure from top of tile to bottom of flange. That's how much you want to remove from pipe. Thinset mortar height will give some wiggle room. Ideally pipe inserts into hub no less than 3/4 of the hub depth.

What underlayment do you intend?

Silicone (not silicon) Sealant Ranger
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