Discover best practices in designing plumbing stacks for bathrooms, including how to size, slope, and position pipes for optimal functionality and cost-effectiveness. Learn from an experienced professional as they navigate through a real-world project, offering insights and tips along the way.
Key Insights
- The design of plumbing stacks is a careful process that involves determining the optimal size, slope, and position for pipes. For instance, a four-inch size may be needed for the main pipe, while a smaller three-inch one can service the sinks.
- It's important to pay attention to the lengths of the pipes to avoid issues such as not having enough length to connect properly. Adjustments can be made by moving the pipes around to gain more space if necessary.
- The placement of the plumbing stack can have implications for costs and construction. The professional recommends stacking in the wall to minimize trenching costs, but this may require discussions with the architect, especially if the wall is too thin for larger pipes.
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In the previous video, we went ahead and got some of our taps in our plumbing stacks. We're going to go ahead and get our plumbing stacks in for our bathrooms.
So what I'm going to do is serve the sinks off of this, and then I'll kind of—it’s kind of weird to come straight into here. We're going to kind of look at how we want to go ahead and do this. But what I'm going to end up doing is go to Pipe.
Let's go ahead. I'm going to make this a four-inch. We might change these sizes up a little bit here. Set Elevation: Slope Up, 1/8 inch per foot.
Then what I'm going to go ahead and do is come out here. I'm going to run kind of along the backside, come up, and then this guy is going to tie in here.
Let's go up our 30. There we go. And then the same thing—I just 45 off to these.
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So again, Inherit Elevation. I could probably make these a three-inch one now, just because it's a little smaller. I'm servicing the single sinks. Come over here.
This one I didn't quite do far enough. Notice how I'm not getting enough length here. Notice how I have the X. The reason for that is because I don't have enough length.
I didn't go far enough here. If I do this and do this, it's kind of wonky. So what I could do—there are a couple of different things I can do—but the main thing I can do is take this guy and slide it off just a little bit so I can get a little bit more space.
Let's go Pipe, three-inch. Need to change our slope. That's the one thing you've got to remember here. And then Inherit Elevation.
So let's see if I can go 45. Boom, boom. We're only going to take this up to these sinks.
We'll do something different on the second floor for those second-floor ones. Because I know we have some above, I'm only going to take this up to three feet for right now, because we're going to have a stack that goes up and allows for the other ones. So, Pipe, Inherit Elevation, come up 45.
Boom, boom. Let's go three feet up. This diameter—three feet. I'm just going to draw it off that way.
Inherit Elevation, Slope Up. Boom. Get the centerline there. Let's go up to three feet. Again, I'm not really caring about these guys because I'm going to eventually delete them.
Then here—come up. There we go. Three feet.
I could delete these right now. If I wanted to get these all dead in the center of the wall, there's a very easy way to do that. Once I delete this, I’ll show that.
If I go AL for Align, I'm going to select the centerline of the wall there, and then I can pick the centerline of the pipe. And there we go.
This one—I'm actually going to move this out. This is going to become my stack from my previous. So which one did it mess up? Can I just—oh, I know what it's messing up.
It's messing up above. That's OK. I don't have it in my line of sight.
Then we'll create another Pipe, Inherit Elevation. Boom. And we'll do here to here. Go up three feet.
And there we go. Boom. Not too bad.
Let's go ahead and do this. I'm going to take this and do this a little differently. I'm actually going to take this drop pipe.
And if I can—that’s another way to do it. If I was working from a pipe as of this, I could go ahead and do Right Click > Draw Pipe like I do with the other ones. I don’t need to do the entire elevation here, but I want to make sure my slope value is correct.
So let's go here. Let's go here. We'll take this to like 15 feet for right now.
Then actually, I'm just going to delete this guy. I wanted to do that a little bit differently. Perfect.
That's looking good there. Let's come up to here and do the same thing. So, Pipe. I'm going to make it the four-inch.
I'm going to change it to my 1/8-inch slope. And I want to go ahead—Inherit Elevation. Come here, come off at a 45.
Boom, come down. Boom. We'll come down here.
We'll 45 over and then come here—the center of the wall. Let's go to 15 feet.
That'll be for our stack going up. We may need to talk to the Architect in this instance. This wall is probably a little too thin for these larger pipes to do the stack.
There are a couple of different ways you could do it. We could have a main plumbing stack that maybe goes up here in this chase. You could stack in the wall.
I would probably prefer to say, “Hey, Architect, let's stack in the wall.” That's going to reduce my trenching as much as possible, just from a cost perspective. And we can tie all these units together.