You must consider all of the weight the floor joists must be able to support.
Bathtub drain floor joist.
How to install a bathtub drain when a joist is in the way.
If it is more than 3 you may need to raise tub up off subfloor just an 1 or so.
In new construction you should readily be able to site a bathtub so its drain falls between joists rather than on top of a floor joist.
Note the photos show a recent bathroom remodel where we relocated the tub drain across several floor joists.
We cut out and doubled up a header where the tub p trap was to be installed.
If a floor joist is right under the drain hole for the tub how in the world can you miss it you can t.
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The floor framing for bathtubs requires special attention.
I could move the tub out 1 to 1 1 4 to clear the joist or notch out the joist to allow for the drain line installation.
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Shane333 tx i set the tub in place and the half floor joist below the drain hole is in the way.
Floor joist in way of drain.
The floor system is 2 10 joists spaced 12 inches on center.
I would go under the house and determine just how much you need to notch the floor joist.