Waste Connection Order

Posted by JoeG on September 04, 2002 at 14:41:12:
Currently, the there is only one "wet wall" in my house with the kitchen on one side and the bathroom on the other. All the fixtures connect to one branch drain line since there is a crawlspace underneath. The current order, moving downstream, is: Shower Kitchen Sink Bathroom Sink Toilet Washer Main Stack However, I'd like to rearrange, causing the order to be: Shower Toilet Kitchen Sink Bathroom Sink Washer Main Stack I've read though that the toilet can't be upstream of a sink on a branch line. Why is that? Can I run a new parallel pipe for the toilet so it ties in at the current connection point? If I did, wouldn't that just make the toilet line the new branch line, with the sinks would then be running into the branch line downstream of the toilet? I have to be careful here because there's very little grade to work with. Thanks! ~Joe~

Posted by JoeG on September 04, 2002 at 14:41:12:

Currently, the there is only one "wet wall" in my house with the kitchen on one side and the bathroom on the other. All the fixtures connect to one branch drain line since there is a crawlspace underneath. The current order, moving downstream, is:

Shower
Kitchen Sink
Bathroom Sink
Toilet
Washer
Main Stack

However, I'd like to rearrange, causing the order to be:

Shower
Toilet
Kitchen Sink
Bathroom Sink
Washer
Main Stack

I've read though that the toilet can't be upstream of a sink on a branch line.

Why is that?

Can I run a new parallel pipe for the toilet so it ties in at the current connection point? If I did, wouldn't that just make the toilet line the new branch line, with the sinks would then be running into the branch line downstream of the toilet? I have to be careful here because there's very little grade to work with.

Thanks!
~Joe~

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