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Thread: American Standard Princeton Install

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    DIY Junior Member Fastclient's Avatar
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    Default American Standard Princeton Install

    I am installing a American Standard Princeton bathtub. I removed underlayment floor in the bathroom down to the subfloor. Unfortunately the subfloor is only 1/2" thick. Also the floor joists run the same direction (length wise) as the tub. I plan to install a 3/4 plywood underlayment. Since the subfloor is only 1/2" would it be wise to install the 3/4" underlayment under the tub first for better support instead of installing the tub on the 1/2" subfloor as the instructions suggest? Would there be any problem with this or is it a good idea?

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    Retired Defense Industry Engineer jadnashua's Avatar
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    The 1/2" is more probably a nominal 5/8" (5/8" before sanded), as 1/2" ply never met US building codes. Adding another layer, keep in mind that the grain must run across the joists, not along them for maximum strength. It can be hard to screw a second layer to a thin one under it without stripping the screws out - you may need to predrill pilot holes in the first layer should you choose to add that second layer. Depending on what you're planning for the rest of the room, that thicker subfloor there may mean the tub edge will be hard to make look good.

    To me, it would sort of depend on what the bottom of the tub looked like. If it had only a few small feet, I'd want more subflooring, but if it's fairly flat or has lots of support area, and based on their installation instructions saying it will work, I may not add more. Is the new tub going in the same location as the old one? If it worked, the new one should. If the tub bottom isn't flat or the tub doesn't sit level, you may want to embed it in mortar which will make it feel more substantial and spread the load out.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    Moderator & Master Plumber hj's Avatar
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    IT is much easier to install the floor first, then place the tub on top of it, which is the way I always do it, than to cut the flooring to fit the tub afterwards.
    Licensed residential and commercial plumber

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    Forum Admin, Expert Plumber Terry's Avatar
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    IT is much easier to install the floor first, then place the tub on top of it, which is the way I always do it, than to cut the flooring to fit the tub afterwards.
    And I almost never do it that way.
    I prefer setting the tub first. The room gets backerboard and drywall. Painted and tiled, and last the floor.
    You can do the floor first, but there are also so many ways to damage it in the construction process.

    In the end, the one doing the work picks the method.

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    DIY Junior Member Fastclient's Avatar
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    Thanks for the quick reply. Another question about the tub. American Standard suggest drain kit 1545.170 for the Princeton tub. It is a lift and turn drain that costs about $120. The front of the tub where the overflow goes is at an angle so I'm sure it would fit great. My questions is there an alternative drain kit that will work as well that is not so spendy? American Standard does make a cheaper one with the overflow on top to raise the water lever 2" but not interested in that one. Does anyone know of any alternative that would work and not empty the wallet? Thanks
    Last edited by Terry; 10-06-2013 at 03:52 PM. Reason: added link

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    Moderator & Master Plumber hj's Avatar
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    quote; last the floor.

    I assume you are referring to the "finish floor", i.e., tile etc. I was referring to the plywood over his subfloor, which the tile is applied TO.
    Licensed residential and commercial plumber

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