stacked bathroom 3d model

[meecect]

I've got a three bath stack currently in CI that I need to replace (using PVC). Does the attached design look right? Is it ok to wet vent the toilet and shower like that? All pipes are 4" and 2".

[meecect]

to avoid the toilet wet vent, would the model below be better?

[Terry]

http://terrylove.com/images/dwv_b2.jpg
This is what we normally do.
Each floor wyes off, with a waste line going all the way, and one or two vents going all the way.
It's too bad they put the lav near the tub or shower on your layout.
It's a better arrangement to have the toilet in the center.

[construct30]

The new international residential code says no wet venting between floors just always keep that in mind. Love Terry's drawing and layout.

[meecect]

Thanks Terry,
I had examined your sample before and was struggling to adapt it to my floorplan, (and that I have 3 floors), but I think my ( second post) attempt comes close as a hybrid between what was there previously and the concepts in your example.

Essentially I have copied the original CI design pretty closely. There was a large CI fitting ( a 'Vented Closet Tee with right side outlet' ) that I have approximated with the wye, sanitary tee with side outlet, etc.

The main deviation is that I didn't separately vent the shower, as I thought that it was permissable under most codes to wet vent through the lav.

Do you see any major issues with my second attempt? Should I bite the bullet and just rearrange the bathroom to go lav-toilet-shower?

[construct30]

Do you have room in the walls or floors to crossover the pipes like that? Terry's design is more efficent without the crossovers.

[meecect]

@construct30,

Yes, I believe I have room, as the crossover occurs in between joists. I have modified the drawing to add a vent on the shower. Would that satisfy IRC?

Plus I was confused on how to extend Terry's drawing for 3 floors.

[construct30]

Two questions I would check with my local inspector since you cannot wet vent between floors or more than two bathroom groups, I would want a vent on the toilet as in my opinion they are being wet vented, How big is the vent stack given the three bathroom groups?

mark

[Terry]

The plan I have, we can keep stacking as the floors go up.
You last picture would work too, it's just a different layout with fixtures.
I haven't put new plumbing in where the lav was between the tub and the toilet. It's hard to get into the tub that way. They did some of that layout in the fifties and before.

Most of my work I show here is without wet venting, mainly so that if it's copied, it should pass an inspection.
If I try to do something out of the norm, I will contact the inspector and see how he feels.
On a large project like yours, you only want to do it once.

[meecect]

thanks again for all the feedback. I just have a few questions left.

Perhaps I don't understand the difference between dry and wet venting, or I misunderstood some of the responses in this thread.

I thought my last picture _is_ without wet venting. Is that right? Or do I not know the difference ?

And when you say 'hard to get into the tub', do you mean like physically harder to get your body in and out, or do you mean it's harder to get the ptrap in the right place, as in hard to get the drain into the tub? Seems like it would be harder to move in and out of the tub if it is next to the toilet, as the toilet sticks out into the room more...although maybe it's harder to reach past the lav to get to the bath controls from outside the tub because the lav is taller.....

You're right about the 'in the fifties' comment. I live in Chicago, so almost everything was built before the fifties, so almost every bathroom looks like this. They even had custom CI pieces ( like the vented closet tee I mentioned) to facilitate this setup. In fact the 'crossover' I'm proposing with all those 1/8 bends was originally accomplished with a CI piece that must have come as some sort of mated pair with this closet tee, because it looks like a part of a system. It's not even a fitting really, it's a 10 foot section of 2" CI with the 'bulge' at exactly the right place to crossover the 2" branch.

[Terry]

Wet venting.
I was referring to the earlier picture.
The last picture you had would pass anywhere.

I Vanity is 22" deep and can be 24" or wider.
A toilet will either be 27-1/4" from the wall or 28-3/4" from the wall and is at most maybe 21" wide at the tank near the wall. The bowl is only 14" wide.

Entering a room with a toilet at the door is harder with the door swing.

If the vanity is near the door, it's easy to wire for light switch and outlet.

[construct30]

Sorry about that, I was mostly just looking at the first drawing. I didn't pay enough attention to the later drawing to see the vent into the toilet.

I was wondering if any one ever had an inspector that wanted cleanouts on some of the vents with a lot of offsets and loops. I know they want them on the kitchen island loop vents. I see some weird venting drawings not showing any way of cleaning some areas. I've had an inspector complain,but not fail.

I hope Terry checks this post again. The inspection thing is only a little over two years old here. I've tried to be conservative in my layouts and stick to the books.

[hj]

Your second concept is proper. The only thing we would do is move the vent stack all the way to the right, past the tub traps, so it could go straight up without the jumpovers which can be difficult to fit into an ordinary wall. You do not need the separate tub/shower vent.

[meecect]

thanks for all the help.

Terry, could you explain what would change in your diagram if there was a another bathroom stacked on top?

[mold-griz]

I was wondering, Meecect,,,what kind of software are you using to get those plumbing layout's?

[meecect]

sketchup. download fitting models in dxf format from charlotte pipe

[Dunbar Plumbing]

sketchup. download fitting models in dxf format from charlotte pipe



I would just pay you to do my isometric drawings if I still did new construction. So much easier than learning all the new software. Easy for the computer literate but very time consuming to someone that doesn't understand the simplicity of it.

[meecect]

well, if you ever decide to get back in the game, let me know ;-)