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Working with extrusion roofs

From: Revit Architecture 2013 Essential Training

Video: Working with extrusion roofs

Footprint roofs discussed in our previous movie are probably the easiest way to create a roof and they certainly are the easiest way to get the most common forms, like hips and gables. However, there's lots of other shapes of roofs that we can create and in some cases you'll want to create a roof that's not easily achieved with a footprint roof. So in this movie I'd like to look at the extrusion roof. This is a good choice for roofs that are barrel vaults or that are curving in one direction, and so on. So in this case I'm going to create an awning that's going to go on the front of this small building here.

Working with extrusion roofs

Footprint roofs discussed in our previous movie are probably the easiest way to create a roof and they certainly are the easiest way to get the most common forms, like hips and gables. However, there's lots of other shapes of roofs that we can create and in some cases you'll want to create a roof that's not easily achieved with a footprint roof. So in this movie I'd like to look at the extrusion roof. This is a good choice for roofs that are barrel vaults or that are curving in one direction, and so on. So in this case I'm going to create an awning that's going to go on the front of this small building here.

Now it's actually on the other side of the building over here, and I'm going to use my view cube over here in the corner to change my orientation. So the way the view cube works is you just highlight the area of the cube that you want to navigate to, and in this case I can use the little corner right here, and if I click that, it'll spin the view around and show me that I have this little patio on the backside. Let me zoom in a little bit and let's say that we wanted to put some sort of a curving awning up above this little patio area. Now I could do that right here in 3D but it actually might even be easier to do that in an elevation view.

So this is the West elevation, and this way I'm looking right at the wall that I want to work on, and to do an extrusion roof, the first step is we have to establish the plane that we want to do the work on. So here in the Architecture tab, if I click the dropdown on the Roof button, I have Roof by Extrusion right here, I'm going to chose that. Now that will pop up this box which will ask me to set my Current Work Plane. You could do that in a variety of ways. If you had a named work plane on this list here that you wanted to use, you could choose it.

I don't have anything there. In this case, I'm going to do Pick a plane, and what that allows me to do is click OK and use the geometry in the building that's already here as the work plane. So I'm going to select the face of this wall and say that I want to draw directly on that wall. Now it's still a roof so Revit will then ask me okay, well that's great, what level do you want to associate this roof to? Well in this case I only have Level 1 and 2 so I'll just put it with Level 2, and I'll click OK. That takes me into Sketch mode, it grays out the drawing as is normal and at this point I can just sketch the shape that I want my extrusion to be.

This is a little different kind of sketch because unlike the footprint sketch, we're not making an enclosed shape here. Instead we're making an open shape, and this shape you're making is the end of the roof rather than the footprint of the roof. So let me show you and have a little fun here, I'm going to do the something that's a little curvy. So I'm going to use my Start-End- Radius Arc, and I'll pick a start point and then I'll go over here to a slight angle and pick an endpoint, and then I'm setting the radius right, so then I'll do maybe a radius about that much, maybe keep going over here and snap it tangent.

And if you want you can change shapes. I can even switch to a straight line at some point, and you can make as whimsical a shape as you want, you don't have to make exactly the shape that I've done here. The key is all you need is one edge for each segment of the roof. In other words, I don't want to wrap around and make an enclosed close shape here in this case. Watch what happens when I click Finish. You can see the thickness gets applied to the roof that comes from the roof type that's being chosen over here, and I'm using a generic 12 inch roof, so that's where this thickness came from. It's 12 inches of material.

The only thing about an extrusion roof, it's a little odd, is if I go back to my 3D view here, it always goes through the building. So Revit, instead of asking us how deep we want the roof to be when we do an extrusion, it makes a guess and it usually guesses based on the depth of your building. So what I'm going to do here is simply select this and then there's a little grip here at the end that I'm going to pull that one out to about there and then say okay, why don't I make that a whole number so I'll do about 55 feet there. And I'll do the same thing here just kind of pull it out here somewhere.

And you could see that gives me a little gap away from the building, which may be my design intent or it may not be, so in my case, I want that to be flush up against the building. This as a great job for the Align command. If I go to the Modify tab, click my Align tool. When we've previously looked at the Align tool we've done it in 2D, but it works just as well here in 3D. I'm going to highlight the face of this wall as my alignment edge, and then I'm going to highlight the face of my roof, and Revit will stretch the roof over and attach it to the face of that wall.

So an extrusion roof is also a sketch -based roof, it's just sketched in a vertical plane rather than a horizontal plane, and all you sketch is the overall profile of the roof and then Revit will extrude it from there. It's good for barrel vaults or for undulating forms like this and it's another alternative to creating a roof form.

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This video is part of

Image for Revit Architecture 2013 Essential Training
Revit Architecture 2013 Essential Training

96 video lessons · 13039 viewers

Paul F. Aubin
Author

 
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  1. 1m 57s
    1. Welcome
      1m 2s
    2. Using the exercise files
      55s
  2. 14m 43s
    1. Introducing building information modeling (BIM)
      3m 0s
    2. Working in one model with many views
      4m 48s
    3. Understanding Revit element hierarchy
      6m 55s
  3. 54m 44s
    1. Understanding the different versions of Revit
      1m 19s
    2. Exploring the Recent Files window and the application menu
      5m 20s
    3. Using the ribbon and the Quick Access Toolbar (QAT)
      7m 12s
    4. Understanding context ribbons
      4m 43s
    5. Using the Properties palette
      8m 31s
    6. Using the Project Browser
      5m 34s
    7. Navigating views: Zooming, panning, and rotating
      5m 57s
    8. The basics of selecting and modifying
      9m 49s
    9. Accessing Revit options
      6m 19s
  4. 47m 6s
    1. Creating a new project from a template
      7m 42s
    2. Accessing a multi-user project with worksharing
      4m 16s
    3. Configuring project settings
      6m 33s
    4. Adding levels
      7m 40s
    5. Adding grids
      6m 23s
    6. Refining a layout with temporary dimensions
      6m 58s
    7. Adding columns
      7m 34s
  5. 1h 11m
    1. Adding walls
      8m 48s
    2. Using snaps
      6m 24s
    3. Exploring wall properties and types
      7m 37s
    4. Locating walls
      7m 27s
    5. Using the modify tools
      9m 32s
    6. Adding doors and windows
      7m 39s
    7. Using constraints
      8m 27s
    8. Adding plumbing fixtures and other components
      8m 39s
    9. Using Autodesk Seek
      4m 19s
    10. Using wall joins
      3m 0s
  6. 1h 11m
    1. Linking AutoCAD DWG files
      10m 59s
    2. Creating topography from a DWG link
      7m 43s
    3. Understanding CAD inserts
      7m 56s
    4. Import tips
      6m 49s
    5. Creating a group
      7m 10s
    6. Mirroring groups to create a layout
      5m 3s
    7. Creating Revit links
      5m 16s
    8. Rotating and aligning a Revit link
      7m 6s
    9. Establishing shared coordinates
      6m 5s
    10. Managing links
      6m 0s
    11. Understanding file formats
      59s
  7. 1h 13m
    1. Working with floors
      8m 57s
    2. Working with footprint roofs
      6m 22s
    3. Working with extrusion roofs
      4m 59s
    4. Attaching walls to roofs
      3m 17s
    5. Using the shape editing tools to create a flat roof
      6m 33s
    6. Working with slope arrows
      6m 0s
    7. Adding openings
      8m 33s
    8. Working with stairs
      8m 4s
    9. Adding railings to stairs
      3m 40s
    10. Working with ceilings
      9m 36s
    11. Adding extensions to railings
      7m 20s
  8. 48m 34s
    1. Creating a custom basic wall type
      10m 18s
    2. Understanding stacked walls
      8m 12s
    3. Adding curtain walls
      8m 17s
    4. Adding curtain grids, mullions, and panels
      10m 59s
    5. Creating wall sweeps and reveals
      6m 26s
    6. Exploring model lines
      4m 22s
  9. 47m 40s
    1. Using object styles
      4m 19s
    2. Working with visibility and graphic overrides
      7m 3s
    3. Using view templates
      6m 13s
    4. Hiding and isolating objects in a model
      6m 37s
    5. Understanding view range
      7m 7s
    6. Displaying objects above and below in plan views
      6m 35s
    7. Using the Linework tool
      5m 21s
    8. Using cutaway views
      4m 25s
  10. 21m 28s
    1. Adding rooms
      8m 15s
    2. Controlling room numbering
      6m 13s
    3. Understanding room bounding elements
      7m 0s
  11. 33m 13s
    1. Understanding tags
      9m 58s
    2. Adding schedule views
      7m 55s
    3. Modifying schedule views
      7m 12s
    4. Creating a key schedule
      8m 8s
  12. 58m 40s
    1. Adding text
      7m 29s
    2. Adding dimensions
      9m 6s
    3. Adding symbols
      4m 42s
    4. Adding legend views
      4m 51s
    5. Creating a detail callout
      8m 31s
    6. Adding detail components
      8m 52s
    7. Using arrays to duplicate objects parametrically
      7m 43s
    8. Adding filled and masking regions
      7m 26s
  13. 41m 29s
    1. Understanding families
      2m 37s
    2. Creating a new family from a template
      6m 29s
    3. Using reference planes, parameters, and constraints
      7m 52s
    4. Adding solid geometry
      8m 40s
    5. Cutting holes using void geometry
      5m 9s
    6. Adding blends
      6m 2s
    7. Completing the family
      4m 40s
  14. 38m 48s
    1. Adding sheets
      7m 44s
    2. Working with placeholder sheets
      5m 24s
    3. Aligning views with a guide grid
      5m 57s
    4. Outputting sheets to a DWF file
      6m 39s
    5. Exporting to AutoCAD
      5m 42s
    6. Plotting and creating a PDF
      7m 22s
  15. 2m 38s
    1. Next steps
      2m 38s

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