Plumbing: 1.5\" line OK for kitchen sink & dishwasher?

[Deleted User]

yeah, don't they ever. whyyyy, back when i was an apprentice, we didn't even have pipe wrenches. we used our teeth

pvc cleaner? what a joke. just another product to sell and backed by 'code'

D107

Kitchen rehab--two plumbers two opinions

(See photo) Plumber A says 1.25in waste line should be 2-inch for kitchen sink and dishwasher. Recommends cutting out smaller connecting T from 4-inch line and putting in new 2-inch one. (Sink and dishwasher are being moved so existing line will be have to be replaced anyhow.) Also suggested that copper lines corrode and better to replace 4-inch line with PVC.

Plumber B says he would not cut section out of 4-inch line, but attach new line via sweat coupling.

Note that in photo the 2" copper line going up just after the elbow from toilet is a vent line.

Thanks,

David

Weezbo

kitchen sinks....

today are piped with a 2" clean out within the cabinet with a 2" drain and 1 1/2" vent for the most part...

long time ago some homes had working plumbing functioning fine...however times change and the real bummer is for the guys who know how to make it work .

that san T's been doing its thing for years...

Unknown

I'd replaced any copper

I'd replaced any copper waste and vents behind any walls. Much easier and cheaper to do it now... 2" waste and 1.5 " vent... Connected properly with proper coupling and when time and money permitted, replace the rest of exposed copper waste pipings which is the worst material forthe job and can't believe the codes stills required it...

D107

thanks; as you can see from photo,

that vent will not cover the sink drain, so plan is to use a Studor minivent within the cabinet. The 2-inch vent line you see covers --I'm told--the toilet, and connects up above and acts as a wet vent to a sink in an adjacent bathroom.

Vent exits horizontally to outside--I wonder if that's code in NY anymore. This work was done around 1981 by prior owners. So I'm assuming you're recommending PVC replacement. Or do you recommend steel with no hub?

Thanks,

David

Dan C._4

I usually

run 2" up to the sink then use 2X 1 1/2 X 1 1/2" TY and stub out 1 1/2" and I have never had any problems. The drain on the sink is going be 1 1/2" anyway.

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kpc_11

an 1.5\" line to....

a kitchen is code by the IPC. w/ a 1.5" vent. IS a 2" line better sure. IF The bathroom is wet vented but nothing else can tie into that... area of the wet vent.

Chris S

pvc or cast

An old time plumber I knew ( now a dead guy) always insisted cast is better. Last week I cut into a 20 year old CI line on a remodel & the pipe was fully 1/4 blocked by the "stuff" that slowly closes CI pipe. I've cut into 20 year old plastic and it looks like new on the inside.
"Joe" claimed that the plastic eroded over time but I've never seen that. We used plastic under slabs in (NJ) commercial work 20 years ago NY finally allows it- I think there will be less problems down the road.
The only benefit to CI is there is no sound transmission as water flows through the walls.
I agree 2" is better for a kitchen sink- though not required. PVC or ABS-both good but don't mix them

edit* And don't fret too much about the copper- scrap is paying really well rightnow

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Jim Bennett

Go with 2\"...

less trouble in the future, especially if you want to add a disposer.

Jim

Steve Eayrs_2

We're UPC code......

and 2" is required for kitchen sinks.
Steve