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Author:
yonson (SC)
Hi Folks again!
In this kitchen I am renovating the drain line for the washing machine is currently a 1.5" pipe. I know 2" is best. The current trap is about 5 feet below the water entry inside a crawl space. I want to get this trap out of the crawl space, With me moving the trap inside the kitchen wall cavity, which will be about 3 feet higher than the trap is now and keeping it 1.5" is this going be a problem? I will also vent this with a 1.5" pipe - it has never been ventedbefore. There has never been a problem with flow through this 1.5" drain. My concern is with raising the trap up - with there be a flow problem now with the trap higher?
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Author:
steve (CA)
I would use 2" for all the new drain piping and 1½" for the vent. You're not suppose to reduce the size of a drain pipe, but why not install the new stuff to code, and if needed, continue the 2" downstream at a later date.
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Author:
ex apprentice 28 (MA)
In Massachusetts we can use 1 1/2 pipe for a washer drain and the stand pipe has to be a min 18inches and max 30 inches. It is a good idea to add a vent if done properly. Can you make a drawing on your plans and how it was before. Is also a good idea to snake the line before it get put back together. How long is the 1 1/2 before it ties into a larger pipe?
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Author:
yonson (SC)
Pipe is clear and clean. The length until it hits the main is about 12 feet. It goes into an existing wye on the cast pipe, hence the reason I was trying to get a feel of allowability. Vent will be 1.5" - same size of the drain. There was no vent previously and they had no problem for decades.
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Author:
North Carolina Plumber (NC)
The problem I run into is when the washing machine is replaced with a new one, the new machines pump more water at a faster rate than the old ones. It's not uncommon to see water being pushed back up out of a short 1 1/2" standpipe when a new machine is installed.
Here in NC the horizontal run would have to be 3", the trap and standpipe 2" and the vent 1 1/2".
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Author:
hj (AZ)
According to Packy, washer drains in Mass have to be 3", and vents are NOT usually "optional".
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Author:
packy (MA)
to which packy are you refering to?
massachusetts has always accepted 1 1/2 inch for a washer and for a kitchen.
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