1 1/4 instead of 1 1/2 for kit drain OK?
It was suggested I post this here. The saga continues. I’ve moved my kitchen sink across the opposite side of the kitchen and now I’ve just found out that the drain line I was going to tie it into is 1 1/4″ (copper) and not the 1 1/2 I thought it was. It’s basically kitchen sink, then a vanity then into the stack, approx 10ft run total. Will it be OK to go ahead and hook it up. Speaking from a functional issue and not a code issue.
Of larger concern is where the vent is in relation to the kitchen sink and vanity. Is it vented at all? Non-vented long kitchen drain lines are legendary for gradually clogging up, so from both a code and functional view point, you're not in the best shape.
Sounds like you're going to go ahead and do it anyway....but I would really look into the vent issue and maybe go for a Studer vent.
Edited 8/4/2006 10:00 am ET by johnnyd
And if you decide to go ahead anyway, make sure you install easily-accessible cleanouts.
If Tyranny and Oppression come to this land, it will be in the guise of fighting a foreign enemy. --James Madison
Thanks to all for the rapid response. I took the advive from one of the previous "helpers" and decided to do it right. I pulled all the plaster from the walls all the way to the stack. I completely removed the old 1 1/4", what a bear of a job, and have now a fairly straight forward job of running the new 1 1/2 drain to the stack. Is the venting still going to be an issue. The 4" stack is about 8-9 ft away, with the vanity drain about in the middle. Thanks again for all your help.
If you really want to do it right, you'll run a vent pipe up out of the horizontal run as close as you can to where your P trap connection is and then elbow over to the stack, connecting with a sanitary tee in to the stack.
Will your drain still work if you have an un-vented 8 - 9 ' run? Probably OK, but as long as you've done the demo work, why not run 2" instead of 1 1/2". That will work better.
Actual plumbers will chime in here I'm sure.
Yes, the only problem was T on the cast iron stack was only a 1 1/2". Can you still go 2" and the finish off in the T at the stack 1 1/2 ?
The 1 1/2 will still be a bottleneck. Any thing stopping you from cutting into the cast, and putting in a 3 X 2 X 3 PVC sanitary T with Fernco or similar couplings?
The 1 1/2 " will probably be OK, it's just that kitchen sink drain lines are usually 2" because of the increased number of solids they have to handle. In any case, put a nice clean out in so you snake these lines out if you ever need to.
8 or 9 foot run without a vent in there? Sounds like a receipe for a dry P-Trap (siphon effect).
I know...that's why I'm trying to get him to properly vent it. I've actually done a vent-less run almost that long with no dry trap effect...but I think I was just lucky. Also, isn't 2" less suseptable to that than 1 1/2?
I don't know if 1-1/4 will be sufficient or not, probably mostly just inconvenient (slow draining), but is it possible to drop a 1-1/2 line with a AAV (Studor) at the top and then reconnect to the same stack below your floor level?
Bad idea no matter what the code says, line will be over-loaded.
I agree with one of the other posts, while you have the wall open put in a 2in. line, if you ever plan to install a disposal the 1 1/2will be too small. You need to run a vent as close to the trap as possible; do it now or have probs. in the future. Lots of luck.
Yes it will work but it may be slower than normal. Does this require a dish washer too? If it does Im doubting it . Theres a lot of difference in the two pipes for flow. More than it sounds like . Someone will probably post the difference as theres a link to it somewhere.
And no its not code accepted .