I'm installing a 4-ft. kitchenette with sink and, due to space
constraints, I am considering running 1-1/4" abs as opposed to
1-1/2" (the lines will tie into 1-1/2" about 8' downstream). What
problems might I run into wrt to draining? TIA!

wrote in message
...
I'm installing a 4-ft. kitchenette with sink and, due to space
constraints, I am considering running 1-1/4" abs as opposed to
1-1/2" (the lines will tie into 1-1/2" about 8' downstream). What
problems might I run into wrt to draining? TIA!

What does the code call for?
MLD

On Sep 20, 9:31*am, wrote:
I'm installing a 4-ft. kitchenette with sink and, due to space
constraints, I am considering running 1-1/4" abs as opposed to
1-1/2" (the lines will tie into 1-1/2" about 8' downstream). *What
problems might I run into wrt to draining? *TIA!

Current min drain pipe (in the wall, not under sink) is 2".

My older home (1930) had some 1 1/2 lines that over the years were
problematic. I had all the cast iron laterals replaced with 2" ABS.

This sounds like a bootleg / non-code project.

Most code changes (modernization) are for safety or improved
performance but there are millions of old installations that work just
fine that aren't up to current code.

A drains at 1 1/4" (for any appreciable run length) are pretty
small.
I think you'd have trouble depending on sink usage (garbage disposal?)

Even 1 1/2" is rather small on a long length run....I would suggest re-
thinking your design & work in 2", the result will more trouble free.

cheers
Bob

This sounds like a bootleg / non-code project.

Bootleg, yes.

Even 1 1/2" is rather small on a long length run....I would suggest re-
thinking your design & work in 2", the result will more trouble free.

Rethinking my design includes the use of a concrete saw...blah ;-).

Thanks for the reply.

You'll want to Tee in an air admittance valve after your trap under the
sink. That'll keep the 8' run of 1-1/4 from sucking your trap dry.

s


wrote in message
...
I'm installing a 4-ft. kitchenette with sink and, due to space
constraints, I am considering running 1-1/4" abs as opposed to
1-1/2" (the lines will tie into 1-1/2" about 8' downstream). What
problems might I run into wrt to draining? TIA!

On 2008-09-20, wrote:

I'm installing a 4-ft. kitchenette with sink and, due to space
constraints, I am considering running 1-1/4" abs as opposed to
1-1/2" (the lines will tie into 1-1/2" about 8' downstream).

As others mentioned, a kitchen sink requires a 2" drain. Consider
routing the drain through cabinets or having it stick out of the wall
a little.

Also, the outer diameter of copper drains is noticeably less than that
of plastic drains (ABS). For example 1.5" Cu and 1.25" ABS have about
the same outer diameter. Since you are only going 8' the cost
shouldn't be prohibitive.

Cheers, Wayne

On Sep 20, 1:52*pm, "Steve Barker DLT"
wrote:
You'll want to Tee in an air admittance valve after your trap under the
sink. *That'll keep the 8' run of 1-1/4 from sucking your trap dry.

That's what I was worried about. It'll definitely be (dry) vented but
as Wayne has suggested,
I'll likely go with 1.5" Cu scraps that were destined for recycling.

Thanks again everybody.