Right size drain diameter

davidro1May 15, 2012

Shower drains drain well when 1.5" diameter. The drain pipe there is an "arm" not a branch, so it can go a certain distance (depending on its diameter) before it needs to connect to venting. Then it becomes a branch not an arm.

Same for washing machine drains.

Here is a link that might be useful: Side discussion here, on drain size for washer

Thank you for reporting this comment. Undo
lazypup

The first step in determining the correct size of drain is to consult the code table that lists all the fixtures and the required minimum trap & drain size.

The code minimum for both a shower & a washing machine is 2" so argue as you might, you are still required to install a 2" drain line for both the fixture arm & the vented branch.

    Bookmark   May 15, 2012 at 4:24AM
Sign Up to comment
More Discussions
Am I the only one bothered by this?
Since Houzz took over, these forums have become a spam-infested...
aliceinwonderland_id
Waste pipe uneven elbow leak
The gaskets are removed to show the situation in the...
rubyhum
Rainfresh water filter leaks from top.
I have a Rainfresh water filter. It seems to be leaking...
gtrshop
38 ga. tank - not getting 2 hot showers?
We have just finished a renovation project that included...
ashebrook
toilet flapper closes too fast
a 5 y.o. AS 4396 w/Fluidmaster guts. The flapper is...
fritzgarden
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™