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Thanks everyone for your help.

I was under the impression that you can't double-trap in a closed system, but if there is airflow between the traps (as in this case), it's ok. That's not true? Right, 18-48" is what I've read the standpipe height should be. The p-trap is about 8-10" below the concrete, so my total height...

Lol, yep I've seen that image posted in lots of other threads I found. I see lots of diagrams like that with roof vents, but I'd like to know whether I can get away without that given that there is airflow in this case. Why is it necessary for the washer to have a P-trap before the T? Isn't...

Hi all, I'm re-doing a laundry area and I think I have a clever trick to venting my washer and sink, but I want to see what you guys think: As I understand it, the purpose of venting is to allow air to escape from the pipes as water tries to flow down. But because of the way the washer's...