Cass said:
That is a running trap is is not allowed / code.
What is the issue?
Cass said:
The tub drain-line is essentially "self-venting" in the sense that it is physically impossible for any amount of water capable of draining from the tub to siphon the trap or build up enough speed to run right on through. I had the same kind of "engineering dilemma" with the drain line for our washing machine quite some time ago, and the same configuration first used there also works perfectly.
hj said:
You seem to have a love affair with square vent 90's in a drain system.
No, I actually do not, and I studied/pondered all my known options for that particular tub drain for a very long time before finally doing what I did.
hj said:
I hope you never have to have it snaked ...
Same here! But, there will definitely be an easy-access panel in that wall when I finally get it finished.
hj said:
Depending on the drain you are using, most can be installed next to the joist and the drain pipe angled to meet it and the overflow riser offset to connect to the tub opening.
Is there a "kit" for an offset overflow, or is that something that must be fabricated? This is the first I have ever heard of doing that, and I really would prefer some better plumbing there. My concern is that the drain line might eventually plug up from "stuff" that did not wash on through hanging around inside and drying out on the wall of the pipe. If I could get the trap under the tub -- 2X6 joists is the next problem -- putting a vent in the wall just a half-tub-width away would not be a problem.