I searched around and couldn't find my answer.
I am renovating the bathrooom in my 1944 home. The house has had many "patches" to it in the past before I moved in. Because of the drain configuration now, I need to replace the pipe to the main drain. My question is that the tub is a good 10 ft from the main pipe which is vented. Do I need to vent the drain closer to the tub? I am doing all of this because of a slow draining tub, but also retiling etc, so this would be the time to add anything. If I do the added vent, would this be the time to add a clean-out access y?
Is 2? Adequate for all of this?

I think code calls for the vent to be much closer. I don't know your set up, but I would add a vent as close as you can. I don't think anybody ever regretted adding a clean out. 2'' should do for a tub drain and vent. A little more fall, if you can, won't hurt either. Engineers say water will drain with 3'' in 100', but maybe not near as quickly as you might like. You also want to carry any solids away too.

Have you snaked that drain. If it's 1944 old that could be why it'd draining slow.

Speedball... could this tub already be wet vented?

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Originally Posted by ludakris

I searched around and couldnt find my answer.
I am renovating the bathrooom in my 1944 home. The house has had many "patches" to it in the past before I moved in. Because of the drain configuration now, I need to replace the pipe to the main drain. My question is that the tub is a good 10 ft from the main pipe which is vented. Do I need to vent the drain closer to the tub? I am doing all of this because of a slow draining tub, but also retiling etc, so this would be the time to add anything. If I do the added vent, would this be the time to add a clean-out access y?
Is 2? adequate for all of this?

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Your tub should be "wet vented" by the lavatory vent. To be wet vented the tub must discharge into the lavatory drain and not the main itself. If you discharge the tub into the main you will need a vent installed not over 5' from the tub trap. 2" is the stardard size for lavatory and tub & shower drainage. Good luck, Tom

Well, I don't know how to explain the current set up.. the drain comes out of the tub, makes a 90 and into a Cast Iron "pot" (3" pipe 8-10" deep). The water comes in the bottom.. fills up, and drains out the top, then about 6 ft to the main drain. The "Pot" has a screw on cap. One big problem is this causes air in the system that will not "vent", but I have snaked the entire set up quite a few times, even vacuumed out the sludge... but it still is a huge problem. My plan is to re-pipe with at least 2" PVC, Vented just out of the tub trap, then to the main drain. Its 1/4 slope per foot, right? Can I run the vent into the same vent as the toilet in the attic before it exits the roof?
Thanks for the help...

Quote:

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Originally Posted by ludakris

well, i dont know how to explain the current set up.. the drain comes out of the tub, makes a 90 and into a Cast Iron "pot" (3" pipe 8-10" deep). The water comes in the bottom.. fills up, and drains out the top, then about 6 ft to the main drain. The "Pot" has a screw on cap. one big problem is this causes air in the system that will not "vent", but i have snaked the entire set up quite a few times, even vacuumed out the sludge... but it still is a huge problem. My plan is to re-pipe with at least 2" PVC, Vented just out of the tub trap, then to the main drain. Its 1/4 slope per foot, right? Can I run the vent into the same vent as the toilet in the attic before it exits the roof?
thanks for the help...

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You have just described a "Drum Trap", outlawed for these many years. Convert to a 2" PVC "P" trap and install a vent within 5" foot of the trap. You may revent back in the attic. /4" slope is normal but if your tight 1/8" is acceptable. Good luck, Tom

I figured it was something that would have been "outlawed", at least now I know what the thing is called. Thanks for the help.. I think I have enough info to tackle this..

For sure a drum trap. Good call Speedball.

Tom