Plumbing Waste Diagram Check

[Jeff H Young]

in regard to offsetting the trap arm in way that Wayne shows . it kind of goes against the way we do things but I think it likely is permitted because water closets and similar fixtures don't need weir of trap below vent opening. pics Terry posts show trap arm on a 45 that doesn't fly on lavs , sinks, showers tubs, but on toilets its a go. I wouldn't feel too confident on an inspection but I cant see an argument that it cant be offset. last post by Wayne isn't a wet vent Just go ahead anyone and point out where a w/c would be illegal to help clarify

 

[Terry]

UPC training manual 1997

 

[Sponsor]

 

[Jeff H Young]

not getting any help looking at those pics Terry . I've never offset my trap arm but looking at those pics don't clarify it . of course diagram " g" depicts an offset and vent is way low on those . I was looking for the code violation didn't find it probably didn't dig deep enough but that doesn't mean much I just haven't found it.

 

[Erik R. Quackenbush]

Well, it occurred to me way too late in this process that as an architect I have fairly easy access to plumbing engineers. I contacted one yesterday, and after talking through the various designs, they sent me back the attached diagram they feel meets the VPC (IPC w/ state amendments). From that I modified my design to what you see below. I think this might be what I go with. All the fittings aren't quite complete yet but I think this layout works. It's a little more work in the closet ceiling than I'd prefer, but not worth worrying about.

 

[Jeff H Young]

that works its got an AAV on above w/c any way. why put another AAV at the lav ? just put a lav waste and tub directly on the vertical stack assuming that goes through roof and not a waste line for an above floor

 

[Terry]

The vent on the lav should handle it.

 

[wwhitney]

For the record, the latest rendering and PDF diagram don't show an AAV at the WC. The rendering is of a wall hung WC and shows the wall tank plus the pipe from tank to bowl.

As an aside, looking at the picture of the internal trapway on a wall hung WC, and comparing it to the trapway on a floor discharge WC, it looks like the wall hung elbow in the wall would have to be pointed downward to match the trapway on a floor discharge WC, and to complete the self-siphoning S-trap. Is that correct, or can it be turned horizontal as was previously suggested in this thread?

Cheers, Wayne

 

[Erik R. Quackenbush]

For the record, the latest rendering and PDF diagram don't show an AAV at the WC. The rendering is of a wall hung WC and shows the wall tank plus the pipe from tank to bowl.

As an aside, looking at the picture of the internal trapway on a wall hung WC, and comparing it to the trapway on a floor discharge WC, it looks like the wall hung elbow in the wall would have to be pointed downward to match the trapway on a floor discharge WC, and to complete the self-siphoning S-trap. Is that correct, or can it be turned horizontal as was previously suggested in this thread?

Cheers, Wayne

Wayne, I talked with a manufacturer on the phone a few days back, and they said that their wall-hung toilets require that you have the trapway no shallower than 45° to get proper suction and flow.

On my last rendering, the yellow is an AAV, and the main 3" stack just terminates inside the cabinet. I extended it up into the cabinet so I can leave an inspection port there. The engineer was of the opinion that no vent or AAV was required on the WC at all.

 

[Michael Young]

I am an architect in Richmond finishing off my attic to handle my growing family. I've finished framing, electrical, and mechanical, and am now designing the plumbing for an additional full bath. I know the building code well, but not the specifics of the plumbing code, so I thought I'd sign up and get some advice. The attached diagram shows what I think I need to do.

Due to the age and construction of the house, I don't want to cut any of the existing floor framing members, so I'm trying to plumb this accordingly. Blue is waste, yellow is vent. For the vanity I was going to use an AAV, and for the toilet I was going to pipe a vent to the roof. All the waste lines run parallel to the floor joists until they can drop down through the top of a closet, where they hook up and head down through the floor to tie into the main waste line in the crawlspace.

One error that I already know is that I need a long sweep tee where the tub drain connects into the toilet drain. Does anything else look like it won't pass code?

what software are you using for your drawings?

 

[Erik R. Quackenbush]

what software are you using for your drawings?

I've been using Sketchup for all this. I have more powerful software that I use professionally, but it's a little more specific to architecture. I still prefer Sketchup for just figuring things out on the fly.