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.
Bathtub drain floor joist.
Jacuzzi 1 5 in foot lock drain with plastic pipe.
We cut out and doubled up a header where the tub p trap was to be installed.
The floor system is 2 10 joists spaced 12 inches on center.
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If it is more than 3 you may need to raise tub up off subfloor just an 1 or so.
A standard bathtub can hold between 40 and 60 gallons of water.
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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How to install a bathtub drain when a joist is in the way.
Prior to drilling holes in these floor joists we installed 3 4 inch plywood to each one.
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Kohler 1 5 in foot lock drain with pvc pipe.
You must consider all of the weight the floor joists must be able to support.
The floor framing for bathtubs requires special attention.
Shane333 tx i set the tub in place and the half floor joist below the drain hole is in the way.
Note the photos show a recent bathroom remodel where we relocated the tub drain across several floor joists.