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Thread: 10 inch toilet in 12 inch rough in - tank brace suggestions?

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    DIY Junior Member zsuguru's Avatar
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    Default 10 inch toilet in 12 inch rough in - tank brace suggestions?

    Installed a new toilet (AS Cadet 3 from HD...and yes I had to take it back twice due to defects) that is a 10 inch rough-in into a 12 inch roughed in space. This was done b/c the wife didn't want a ADS/right height/tall toilet and the only short ones HD had were 10 inch rough-in. Everything seems to work fine but there is a pretty big gap between the tank and the wall, maybe 5 inches or so.

    I'm curious if it would be a smart idea to brace the tank to keep it from leaning back should someone (like the cats) bump it just to keep it from moving?

    Also, in the other bathroom (for a 13 year old kid) would it be wise to do the same there? That toilet is a 12 inch rough-in toilet in a 12 inch roughed in space so the gap is only an inch or two.

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    DIY Senior Member wjcandee's Avatar
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    Quote Originally Posted by zsuguru View Post
    Installed a new toilet (AS Cadet 3 from HD...and yes I had to take it back twice due to defects) that is a 10 inch rough-in into a 12 inch roughed in space. This was done b/c the wife didn't want a ADS/right height/tall toilet and the only short ones HD had were 10 inch rough-in. Everything seems to work fine but there is a pretty big gap between the tank and the wall, maybe 5 inches or so.

    I'm curious if it would be a smart idea to brace the tank to keep it from leaning back should someone (like the cats) bump it just to keep it from moving?

    Also, in the other bathroom (for a 13 year old kid) would it be wise to do the same there? That toilet is a 12 inch rough-in toilet in a 12 inch roughed in space so the gap is only an inch or two.
    Not to be harsh about it, but perhaps for around the same money from your local plumbing supply if you shop around you can find a Toto Drake CST744S (1.6gpf) or CST744E (1.28 gpf), both of which would be on a 12" rough-in at the regular height. And of course they are high-quality and perform magnificently. Five inches from the wall is pretty unsightly, and adding bracing isn't going to make it prettier. All toilets are going to have gaps behind the tank of some size, so it really doesn't seem to matter whether it's 2" or 5", the tank shouldn't be rocking or require bracing in either case. Bracing, of course, only keeps the tank from moving in one direction (towards the wall), not the other (away from the wall), so it seems like getting the tank installed nice and firmly is really your best bet.

    I'm a little suprised that you have 2" behind the one that's on the 12" rough-in. Even the Drake, which has one of the bigger gaps, leaves only about an inch behind the tank to the wall on a 12" rough-in.

    Good luck!!

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    DIY Junior Member zsuguru's Avatar
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    Don't worry about being harsh. Wisdom can often be harsh as it comes from learned (painful at times) experience. I appreciate your honesty!

    I get ya - I'm not a fan of HD or L but they're "available." The plumbing supply cos around my house sell AS and some other brands...I forget which but NOT toto. The nearest Toto dealer is 30 miles away! I'll have to ask next time I'm in one of those places why they don't sell Toto. I know most of the plumbing companies around here use Kohlers (idk why, but that's what they say they use).

    I just measured the rough-in (again) and the wall is actually really crooked. 12" inches on the one bolt and then 12.5" on the second. Both toilets share the same wall back2back. Nothing is straight in this house I swear!

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    In the Trades Gary Swart's Avatar
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    I would bet you that most, if not all, of the local plumbing stores could order a Toto for you. But, is 30 miles a huge deal? Remember, a toilet is a purchase that you will live with for years to come, so an extra few minutes drive won't seem too important as time passes. FWIW, I made a 300 mile round trip over a mountain pass to get my first Toto, lucked out on the second because Terry Love was coming within 35 miles of my home and I picked it up there. It may not be the wall that is not square, it could be the flange was not set straight. At any rate, you have a 12" rough in.

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    Moderator & Master Plumber hj's Avatar
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    The most common scenario is that a supplier has a "common" regular height 12" toilet, but NOT a 10" one. NO ONE puts a brace behind the tank for any reason. If it is going to break, it will do so unless the tank is tight to the wall, and it happens so seldom that it is not even a consideration when we install ANY toilet. The mechanics of the tank to bowl connection is such that any force that would crack it would probably damage it even with a brace.
    Licensed residential and commercial plumber

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    In the Trades Gary Swart's Avatar
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    If you are bound to stay with the AS toilet, then you will just have to live with the space. If you want a toilet that will properly fit on a 10" rough-in, then you should look at the Toto toilets that use the Unifit adapter. Toto is the only company that makes an adapter to fit a toilet on 10", 12", or 14" rough-in flanges, but they will only work on specific models. Besides fitting the space properly, these are first rate toilets in both appearance and performance. These can be ordered by a plumbing shop or purchased online. Online has some risks in breakage although if the toilet arrives broken and you inspect it before accepting delivery, the shipper will replace it. That's a hassle of course, but I think the shippers are doing a better job now that they did in the past to better pack methods to cut down on this problem. As I stated in an earlier response, a toilet is a purchase that should last for many years so a bit of extra time and effort now will payoff many times over in the next 30 year or more.

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