Could anyone show how to draw a riser diagram for this bathroom layout.This is an 8x12 bathroom addition which will have a crawl space below. Thanks in advance for your help. Kamp

Riser infers water supply so, 3/4 copper, CPVC or PEX as the main supply lines, using whatever transition you need to tap off the house supply, Shark or Gator bites and CPVC is probably easiest Use a 3/4X3/4X1/2 "t" at each place where you want a riser to go. Plumb 1/2 Hot and Cold through the floor to shower mixing valve, you may have to braze a fitting depending on the type and brand, and 1/2 cold to the toilet with a stop valve and a braided 1/2 IP to toilet connector and 1/2 hot and cold into the vanity. Install stop valves and then braided 1/2 IP to 1/2 compression to the faucets.

Ma864 did a great job of laying out the water for you but I thing you were asking about the drainage, Correct?
Your's is a simple lay out. I'm not computer savvy enough to make a finished drawing but I've given you a rough sketch.
Your 4* main will connect to the toilet and the vanity and shower will be 2" and 45 back in to the main. Your fixture placement will require two vents, The vanity vent will go up through the roof of revent back into a dry vent, For the shower vent you will roll up a combination wye and eighth bend or a wye on a 45 degree angle and take the shower vent off from that. However if you can reposition the vanity over on the side of the main the shower is on we can wet vent the shower aa shown in red. Not that I'm suggesting that you position them that way but I'm giving you a option. Your slope will be 14" to the foot. More questions? I'm as close as a click. Tom PS. I meant to 45 into the main from the toilet. Please excuse the sloppy drawing. T

Thank you both for your answers.The drainage sketch is great and I see what you mean about using the space next to the shower for the vanity. Doing that free's up space for the washer/dryer combo.Should the riser diagram show water and drainage? After moving the sink to the shower wall would the shower and vanity vent together? Then I would vent the washing machine separately? Small world speedball you live in Sarasota.I spent 1976 working for Mel Miller Construction as a laborer.Don't know if they are still in business. I learned a lot of carpentry but very little plumbing. Thanks again for any help with the diagrams. Craig

Sorry for any confusion. Here in GA, we refer to risers as piping for water supply and drains as DWV with the drain connection as a stub out. Hopefully we both solved your supply and drainage, Brian

Should the riser diagram show water and drainage? when we lay out a set of plans we never draw in 6he water. Too many variables. The plumber lays out the water on site. Ma0641 laid your water pipes out in his head and then put it down in a post. But neither he or I knows what we'll run into till we get on the site. We draw up the drainage.
first because we have to make a material list from it and use it on site for reference.
OK! So now we have a washer to add to the mix. All well and good but that will add a third roof vent to the job.
The problem is the main. I can't cross over it with the shower drain to wet vent to the lavatory drain drain. Do you want me to draw it up showing three vents? Regards Tom

Brian... Thanks for the input... I'll use pex off the existing copper hot & cold feeds... the compression shut-offs are great for a novice like me... Tom... Since we are adding the washer dryer after consulting on it today could you draw it with the 3 vents? I'm against the W/D combo since that now means running a gas line but have been overuled. Thanks again to both... Best, Craig

My computer's having loading paint shot, All I can get is a pen but nothing else. I'll have to reinstall it, Sorry for the delay, Regards, Tom

Hi Craig

I drew up a basic layout that I think shows how me and Tom might pipe this for you... ;)

The washing machine vent CANNOT be used as a wet vent so the layout of drains/vents changed a bit as you suspected.

In this case, if your local plumbing code allows, the shower drain/vent will be used to wet vent the toilet, and the vanity and the washing machine will each get an individual vent. These vents can all combine up in the ceiling/attic and then penetrate the roof with a single 2" vent if you want. To connect the vents will require us to chat more, but let's start here with the basic drainage.

My drawing below is a basic guideline that can be changed up a little if needed, but overall this makes the most sense to me. Be sure, at a minimum, to add cleanouts as indicated.

Check it out and let us know what you think, OK?

Mark

Thanks Mark, That's the way I wanted to draw it up. Nice to know some one has your back.
Craig, More questions?

Guy,s... Spoke with my Inspector this AM [in New Jersey] and wet venting is allowed. He asked to show required vent clearances from openings into the building.On your drawing Mark the wye that rolls above the drain centerline refers to keeping it higher than the sewage flow to prevent backup? Also what suggestions for connecting the vents in the ceiling space? Thank you again guy,s... Best Craig

The wye fitting rolls above the centerline of the drain pipe to make the branch of the wye a real vent. If it was located at the center of the drain pipe it would strictly be a waste line... ;)

In terms of connecting the vents, remember that vents must pitch from the roof to the drains in such a way that rain water will flow, by gravity, down the vent pipes and into the drains. Here, this means that the pipes pitch, as mentioned, but it also means that the direction of the sanitary tee fittings is reversed compared to drainage, i.e. the tee fittings connecting vents are turned upside down... see image below. Ignore the drains here, just look at the direction of the vent fittings and note the pitch.

You'll want to go online and study basic venting principles so you are clear on this stuff, OK?

Mark

Mark... Just saw what you mean about pitch and reversing the sanitary tees by a visit to my attic. Any thoughts on the inspectors request to show vent clearances from openings into the building? Craig

.On your drawing Mark the wye that rolls above the drain centerline refers to keeping it higher than the sewage flow to prevent backup? Almost correct! The wye is rolled up to prevent the discharge from entering the vent.

[in New Jersey] and wet venting is allowed. The placement of the 4" branch prevents us from wet venting your shower.

Also what suggestions for connecting the vents in the ceiling space? You may tie all three vents together in the ceiling to make one vent but that one vent has to either:
1. Go out the roof
2. Revent back to a roof vent in the attic, **or**
3. Revent back to a dry vent from a fixture. If you choose this option the vent must be dry all the way to the roof and you must connect at least 6" above the flood rim of the fixture.
4. and I can hear your inspector yelling already. Ask him if AAV's Air Admittance Vent) are permitted. It's a long shot but easier then the reest.
If this were my call I'd go with door #2.
Good luck, Tom

Craig said, "Any thoughts on the inspectors request to show vent clearances from openings into the building"?

Yup! He wants you to be sure that you won't be within 10 feet of any windows, skylights,doors, etc. so draw the windows, doors, skylights, etc. and then show that you are penetrating the roof at least 10 feet from any of these and he should be happy... ;)

Here's the basic code he's thinking about:

Location of Vent Terminal.

1.No vent terminal shall be located:

a.directly beneath any door, window, or other ventilating opening of the building or of an adjacent building;

b.within ten feet horizontally of such an opening unless it is no less than two feet above the top of such opening.

2.Plumbing vent terminals shall be located no less than 25 feet horizontally from all fresh air intakes.

3.Plumbing vents that terminate no less than two feet above the top of the fresh air intake may be located as close as ten feet.

Good luck!

Mark