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Rant: Everyone says to use a 12 inch rough-in for toilets, but I just measured 30 bathrooms and 14 inch was way more common

I'm a painting contractor, but I help my buddy who does remodels with the demo and measuring. We were pricing a job for a whole house redo in a neighborhood built in the 70s. He told me to just assume 12 inch rough-ins for the three bathrooms when ordering the new toilets. I got curious and actually measured the distance from the wall to the center of the floor bolts on every single one. Out of 30 toilets in that neighborhood, 18 of them were actually set at 14 inches. That's over half. It blew my mind because every guide and video acts like 12 inches is the only standard. If I had just listened and ordered three 12 inch toilets, we would have had to move the flange on every single job, adding a ton of time and cost. Now I measure every single time before I even write a quote. Has anyone else run into this, especially in older homes? What's the weirdest rough-in you've actually found?
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3 Comments
blair_chen81
Yeah, that 14 inch rough-in was super common back then!
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richard_young80
Ran into that with my old house. Had to get a special offset flange to make a new toilet fit... the kind that angles the pipe to hit the right spot. Home centers usually have them in the plumbing aisle. Just measure twice before you glue anything.
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baker.christopher
Good thing you checked first.
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