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Posted by on February 16, 2007, 7:16 pm
> mikelikess...@gmail.com wrote:
> > I ripped out a 30 x 60 tub/shower and am replacing with a 34x 60 walk
> > in shower (prefab fiberglass pan). The plumbing is currently a 2"
> > drain that tees into a 1.5" tub drain and 1.5" tub overflow drain. My
> > plan is to cut off the t and replace with a 1.5" elbow connected to
> > the shower drain. Will this work and will there be any venting
> > problems? I.e. is the venting already handled by the existing plumbing
> > (which is below concrete slab I can't see).
>
> > thanks!!
>
> The 1 1/2" P-trap for the tub must be buried in the slab too. Right?
>
> The vent connection (if any) for the trap is downstream
> from the trap outlet, so anything you do upstream won't
> affect it.
>
> It will probably work just fine, even though 1 1/2"
> is considered a bit small for shower drain.
>
> One thing you might consider is placing a TEE where you
> make the connection, instead of an EL. In the top of the
> TEE, put a cleanout Plug so you can get a snake in.
> It may be very difficult to snake thru the trap from
> the shower drain opening.
>
> Jim
Great feedback Jim thanks. Maybe you (or someone else) can help
answer this follow up. Why is 1.5" good enough for the drain pipe
when it's a combo tub/shower, but a 2" is required when it's a
dedicated shower? It seems as if a 1.5" is good enough in the first
scenario it should work in the second. Is this just an overly
conservative code issue?
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