PVC at odd angles

[LazyPup]

This is going to be tighter than a scotchmans wallet but I think I have you a working solution.

A shower stall is required to have a 2" drain line but a tub/shower only requires an 1-1/2" line.

The estimated overall run is 24" + 42" = 66" (5.5')

1-1/2 must have a 1/4" per foot pitch so the pitch allowance from the cast to the trap is 5.5 (5 x 1/4)+1/8 = 1-3/8"

You currently have 3" vertical clearance with the 2" pipe therefore dropping the pipe to 1-1/2" will drop the top of the pipe about 1/8" leaving about 3-1/8" vertical from the top of the pipe to the underside of the subfloor.

Subtrating the pitch allowance from the vertical clearance we get 3-1/8 - 1-3/8 = 1-3/4"

You will need two 1-1/2 street 1/4 bends and a 2 x 1-1/2 bushing.

On the open end of the PVC from the cast install the 2 x 1-1/2 reducer bushing then install an 1-1/2" street 1/4 bend turning vertical. You can then install the second 1-1/2 street 1/4 bend at any infinite angle to return your run to the desired angle.

[Steve Roylance]

I see... that would be really tight. The tee off to the vent wouldn't be anywhere near 45 degrees, is that 'negotiable'?

The fernco would be easier, but I want to do this right.

[LazyPup]

An easier and better solution would be to remove the 90 on the vent, then run the vent straight though the joists and tie in on the line to the tub. This would put the vent closer to the trap.

[Steve Roylance]

The tee+45 degree bend to connect to the vent takes up the whole 3 inch vertical clearance.

[LazyPup]

If you remove the galvanized 90 off the vent and run it strraight through the joists it should come out at about the same elevation as the drain line at the tie in point.

[Steve Roylance]

I thought that vent lines had to be tee'ed off at at least a 45 degree angle.

[LazyPup]

This will eliminate the offset on the vent line and the tight fit near the cast iron.

[Steve Roylance]

the back-to-back 1/4 street bends takes up more than 4 inches of vertical clearance, at least using the bends my local hardware store has. Are lower profile bends available?

[LazyPup]

Back to the drawing board.

If we were working with 6" and greater they make a 1/32 bend which is 11.5 deg but unfortunately they don't make them under 6".

For as much as I would hate to do it, I think your only alternative is going to be a fernco.

I would still run the vent straight through to the tub drain line. This would allow a longer run on the first section to the 90 which would be less stress on the fernco and it also elimates the need to offset the vent downward to meet the pipe.

[HayZee518]

Lazypup - what about heating it with a pvc conduit bender and forming it to where it will fit?