3

What is the plumbing Code for Washing Machine Drain?

I want to install an extra washer and dryer in my detached two car garage.

This is a picture from a house under construction.

I believe the Drain is 2 inches. Then it appears to be upsized to a 3 inch PVC in the crawlspace.

Washing Machine Plumbing

4

You're correct, the requirement for washing machine drain is 2".

To determine if you have enough drain capacity for an additional machine, you need to consult the Uniform Plumbing Code's Drainage Fixture Unit values and ensure the total fixtures don't exceed the capacity of the drain for your laundry room (or plan an upgrade.)

These tables should help get you started:

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.