New answers tagged attic
Is it a tub/shower combo? If it's totally gutted, what about adding a tub spout with a diverter valve? The vertical column of water to your shower will drain after every use. As long as all the pipes in the attic are pitched, you should be fine.
Definitely consider the first couple of comments regarding whether the joists are even strong enough to support a floor. Presuming the joists are strong enough, you could probably run firring strips on top of the existing joists, these could be 2x4's on their sides, or you could rip them down to 2x2's. You would either notch them or just cut them and leave ...
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