Join Paul F. Aubin for an in-depth discussion in this video Working with ceilings, part of Revit 2018: Essential Training for Architecture (Imperial).
- [Voiceover] In this movie let's take a look at the Attach Walls Top and Base features. So when you have walls, you can actually attach the top or base of the wall to other surrounding geometry. So in this example, it's pretty obvious where I need to attach. I've got several walls here that don't go all the way up to the roof. And I'd like to fill that gap in around there. So, it's pretty easy to do. When you select a wall, you'll see here on the Modify Wall panel, that you have an attached top and base command. And it will allow you to connect the top edge of that wall up to the roof.
Or even the bottom edge down to some other geometry. So I could do it one wall at a time, of course. But, what I actually wanna do instead is select Chain of Walls. It'll be a little bit more efficient. So, I'm gonna highlight one of these walls. Don't click it yet. Okay, so it's important to highlight it. You just move your mouse over it and let it highlight under your cursor without clicking. Press the Tab key. That will go around and highlight the chain of walls. Now, a lot of people will make the mistake next of saying "Yup, that's it that's what I want" and moving the mouse away.
Didn't select anything. So it's highlight, Tab, then click. That's how you make a chain selection. So I'm gonna highlight. Press Tab. And then click to get the chain. Now, let me just show you there's actually more than one chain available there. So I'm gonna click an empty space to deselect. Highlight again. Press Tab. So that's the chain that I want. It's going around the main portion of the building. If I move my mouse slightly more to the exterior side of the wall, notice that the chain will flip and it will go around the entire building.
Now I don't really want that in this case because I'm attaching to two different roofs. So you really wanna make sure you're getting the inner chain here. So you just move your mouse to the inside edge of the wall. And then that's when you click. So it takes a little bit of practice, but it's definitely worth doing. Don't give up on chain selection. It's really, pretty powerful way to select. Now, there should be seven walls in the selection. So when you look over at the Properties Palette, it says Walls (7). If you see Common and another quantity, or if you see Walls and another quantity, then you don't have the right selection.
So you want to investigate that before you continue. Now, in your own projects, you're gonna have to just have some sort of hunch on how many objects need to be selected. But usually, you have a pretty good idea. And if the quantity looks a little bit off, you can stop and investigate before you continue. But in this case, seven walls is what I want. I'll go to Attach Top and Base. On the Options bar, there's two options. Top and Base. Since we wanna go up to the roof, we're gonna leave this at the top. And then all you need to do is select what you want to attach to.
And in this case, that's the roof. So just click anywhere on the roof. And those wall will go up and attach to the roof. Now, if I orbit slightly, you can kind of see that they've gone up there and attached to the undersides of that roof. Now, I'm gonna do it again over here. I'm gonna highlight one of these walls. Press tab. And again you can see the chain that it's giving you. If you move slightly, it would highlight something different. So we want just the wing of the building this time.
And I will click. However, at this point, it says Walls (4). And that's because of this small little piece of wall up here. I really only want three. Now, if I were to go to the Attach Top and Base command here, and choose the roof. It would complain about that one small roof there. It'll say "The highlighted wall is attached, "but misses the target." Now there is an option here to detach that target. So you could certainly do that and that would work.
Or the alternative, if I do CTRL+Z, is to highlight, Tab, and click. And then just hold my Shift key down and deselect the wall that I don't want. Go to attach, and pick the object to complete it and it won't get the error that time. So it's not necessarily a bad thing to have too many walls selected. But you'll get the error and you'll have to kind of deal with some confusing lingo in the Error dialogue. And it's little bit nicer if you just select the actual objects you want first.
Now, I should point out that this attachement is not a one-time operation. This is now a relationship between these two objects. The walls are attached to the roof. So in other words, if I were to select the roof, scroll down here and change the slope of this roof, it's currently a 4 and 12 slope and I'm gonna change it to an 8 and 12 slope. Well, you're gonna see the roof get much steeper and notice the walls stay attached. Now, another place where you can see this very clearly is in the Section views. So I've got a section here called Section at Lobby.
And if I zoom in right here you can see that wedge cut at the top of the wall. And if I change the slope of the roof back again to something shallower, like 5 and 12, you're gonna see it change that slope of the wall. Now, if you watch the movies on Creating Floors, then we've already talked about the Attach Top and Base there. The difference was, when we created the floor geometry, it automatically asked us if we wanted to attach the walls to the underside of the floor.
And that was this right here. And you may recall that if we detach it, that that wall will now ignore the floor and just go all the way up to the level. So all that command was really doing was doing the attach geometry for us. And the same is true with what we just did here. Just with the roof, it actually follows the slope as well. Now, another thing that's important to understand, is in either case, this wall, if I select it, it says it goes up to level two.
And the only clue that you have that it's attached to something is right here. There's a small grayed-out checkbox that says "The top is attached." And the same would be true of this wall. The top is attached. Now, let's take this roof here. Let's go to the Base Offset From Level and I'm gonna increase that to about four feet. That pulls the roof up and notice that the walls stay attached. Okay, so that top edge continues to be attached there. The only things is if I select that roof, notice that the Top Constraint still says that it goes Up to the Level High Roof right here.
So it's a little deceiving or a little misleading there when you click the wall. You need to be aware of that. That if the top is attached, then the height information you're seeing here may not be completely accurate. So just keep that in mind in your own projects. I'm gonna Undo to pull that roof back down again. So anytime you want the wall geometry to follow the shape of the surrounding roofs or floors, then you can use the Attach Top and Base command and it will not only connect those wall edges to those corresponding objects, but it will keep them connected as the model changes in real time.
First, get comfortable with the Revit environment, and learn to set up a project and add the grids, levels, and dimensions that will anchor your design. Then author Paul F. Aubin helps you dive into modeling: adding walls, doors, and windows; using joins and constraints; creating and mirroring groups; linking to external assets and DWG files; and modeling floors, roofs, and ceilings.
Paul also shows advanced techniques for modeling stairs and complex walls, adding rooms, and creating schedules. Finally, discover how to annotate your drawings so all the components are clearly understood, and learn how to output sheets to DWF, PDF, or AutoCAD.
- Understanding BIM and the Revit element hierarchy
- Navigating views
- Creating a new project from a template
- Adding walls, doors, and windows
- Adding plumbing fixtures and other components
- Linking AutoCAD DWG files
- Rotating and aligning Revit links
- Working with footprint and extrusion roofs
- Adding openings
- Adding railings and extensions to stairs
- Creating stacked and curtain walls
- Hiding and isolating objects
- Adding rooms
- Creating schedule views and tags
- Adding text and dimensions
- Creating new families
- Using reference planes, parameters, and constraints
- Plotting and creating a PDF