Join Paul F. Aubin for an in-depth discussion in this video Creating footprint roofs, part of Revit 2018: Essential Training for Architecture (Imperial).
- [Voiceover] In this movie we're gonna talk about the footprint roof. Now, Revit offers us a few different ways to create roofs, but the footprint roof is perhaps the simplest one and its a sketch based object that you create much the same way as you would create a floor. So, typically you're gonna wanna work in a floor plan. And probably makes sense to be in a roof plan, so let me double click the high roof plan here to go to that view, and then on the architechture tab we've got our roof button right here. It is a split button with a drop down and the option we want is roof by footprint but that's also the default for this command.
So you can either click the button right here, or choose it off the menu. Either one will get you into this sketch. Now this is sketch mode - the model canvas grays out, the ribbon tab turns to that tinted green color. We have the mode panel with the finish and cancel buttons. And it defaults to boundary line here and pick walls here. Now we're gonna accept all of those defaults. On the options bar, we have a defines slope check box, which is currently checked, and an overhang feature which is currently set to two.
And I'm going to accept both of those defaults as well. So, the way this works is if I come over here and I highlight one of the exterior walls because of the pick walls option, notice that instead of putting the sketch line right on the wall itself it's actually showing me a dash green line that's offset at some distance away. That's the two foot overhang. So if you click, it will create the sketch line offset at the distance of the overhang from the wall. Now, if you accidentally click to the inside, it's not a big deal because there's a flip grip here and you can just simply click that to flip it to the outside.
So just make sure that your sketch lines are going to the outside. Now, notice the small little triangle. That triangle is because of the defines slope option. So the way to think about defined slope is imagine that this line is actually a hinge. And what's gonna happen with the roof plane is it's gonna hinge up along that edge. And its gonna hinge up in a slope that is essentially seven and 12. Now, its really six and 119/128 so it's very close to seven, but we can actually change this slope to anything we want.
So I'm gonna change that slope to four, and notice that all I have to do is type four. When I press enter, the unit format for slope in this project is so many inches of rise over so many inches of run. And so it will automatically see that as inches, 4 and 12. So I'm gonna click the next exterior wall, change that to four and 12, and the next one right here, change that to four and 12, and finally the last one right here, four and 12. Now, if you watch the previous movie on creating floor sketches, you know that if we tried to finish right now, that Revit would not be happy because we haven't enclosed our sketch.
So I'm gonna click my continue button here and what I'm gonna do next is go to my trim and extend to a corner and I'm gonna close up this sketch on all sides so that I have a nice enclosed rectangle in this case. And when I click finish this time, it will complete the command and if I deselect it you can see that what we've created is a hip roof. Now it might be nicer to see this in 3D so I'm gonna use the small birdhouse icon here to open up the default 3D view, hold down my shift key, drag my wheel, kind of spin around a little and you can see that we have this nice hip roof.
Now, that hip roof doesn't really match the shape of the building too well, so perhaps I might want to modify it. Now it turns out that you can actually modify this object right here in the 3D view. So you don't actually have to change views to do this. If you want to go back to the high roof plan, you certainly can, but what I'm gonna do is edit it right here, and just choose edit footprint. Now what I wanna do is select this line, hold down the control key, and select this line just those two and I'm gonna uncheck defines slope.
When I do that and I click finish. That will convert that from a hip roof to a gable roof so each edge of the roof can either be sloped or not and you can see that that gives you different shape roofs by doing so. Now, the roof still doesn't really match the shape of the building, so lets edit it one more time. And it turns out that you can actually manipulate the sketch right here in 3D as well, so whatever's convenient for you. I'm gonna go back to pick walls, I'm gonna leave the overhang, but I'm gonna uncheck defines slope and I'll select this wall, and this wall, and notice that Revit will automatically clean up the corners for me.
Now if for some reason it does not do that you can just simply use your trim and extend to corner and do it yourself. Let me click finish and now you can see that the shape of my roof more closely matches the shape of the building. Now in this portion of the building here, I want a second roof so I'll go back to roof by footprint and because I'm working in 3D it will ask me what level I want to build this roof at so this is just an alternative way to do it so I'm gonna build it at the low roof height, click yes, and then use my pick walls, turn on define slope, and pick this edge back here.
Now I'm gonna change that slope to just two and 12, so it's gonna be a much shallower slope, and then I'm gonna turn off define slope and pick this edge, this edge, and then finally switch to draw mode and just pick a straight line and cap off the ends right here and here. Remember that you need to have an enclosed sketch in order to finish. So now I've only got one sloping edge, all the other edges are not sloping, so when I click finish, what I get is a shed roof.
So using the footprint roof in a combination of sloped edges and non sloping edges you can create all of the traditional forms of roofs: hips, gables, shed roofs. And its just a matter of editing the sketch and manipulating which edges are sloped and which ones aren't.
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