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There are certainly other videos in this course that had us extruding a roof.

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But none that had us actually doing it for our main roof.

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Suppose you have a roof that is impossible to create in a plan view.

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That's where roof by extrusion comes into play.

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What we're going to be doing in this video is create a reference plane to

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start our roof.

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Then we're going to sketch out our radial profile.

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Once we're finished,

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we're going to extrude the roof to the other side of our building.

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Sounds easy enough, so let's get started.

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Open up your edit roofs model or, of course,

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any model that you may be working on.

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The first thing I'd like to do is go to our three roof floor plan

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in the project browser.

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On the Architecture tab, go ahead and

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click on the Reference Plane button on the Work Plane panel.

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On the Draw panel, click the Pick Lines button.

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Let's get it an offset of two feet.

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I'm going to hover my cursor over the outside face of this wall.

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When I see my alignment line go to the left, I'm going to go ahead and

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pick the wall.

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I can then, grab the grip and stretch my reference plane up.

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I can grab this grip and stretch my reference plane down.

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It doesn't really matter the extents.

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Hit escape a couple of times.

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Go ahead and select your reference plane.

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Go to your Properties tab.

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For the name, call it roof edge.

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Let's hit Apply.

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Let's hit escape a couple times.

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This time I want to go to the elevation facing this wall.

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That's going to be our west elevation.

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I'm just going to double click on the datum here, and that brings me to it.

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Now I'm going to go to my Architecture tab.

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I'm going to go Roof > Roof by Extrusion.

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Revit wants me to me pick a plane, so I'm going to click the drop down,

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I'm going to go to Roof Edge.

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I'm going to click OK.

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I'll accept the defaults for now, that's fine.

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I'm going to hit OK again.

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What I'm going to do is, I'm going to click my Ref Plane button.

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I'm going to offset two feet.

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I'm going to offset two reference planes out.

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To do that, on the Draw panel, I'm going to click my Pick Lines button.

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And draw a ref plane for that side, and a ref plane for this side.

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Now I want to start drawing my shape.

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First thing I'm going to do though,

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is in my Properties dialog, I'm going to hit my dropdown.

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I'm going to find something I like.

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I'm going to grab Generic 9 inch.

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On my drop panel, I'm going to click on Start and Radius arc.

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I'm going to pick an endpoint here, I'm going to come over a bit,

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maybe about 39 feet, I'm going to draw an arc going up.

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I'm going to come over here, I'm going to pick this endpoint.

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I'm going to draw an arc going about like that.

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I'm going to hit escape.

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You can draw any shape you'd like.

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For my extrusion end, I'm going to type in minus 100 feet, and hit enter.

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Then I'm going to click on the Finish Edit Mode button.

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I'm going to go to a 3D view.

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Now see I made the wrong choice but that's okay, we can fix that.

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In the project browser let's go to our roof plan.

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Down here let's create another reference plane.

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So in the Architecture tab, let's click the Reference Plane button.

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On the Draw panel, let's click our Pick Lines button.

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And let's offset it two feet.

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Let's hit escape.

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Type al for align.

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Go ahead and select your reference plane.

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Come all the way over to your roof.

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And click this opposite face.

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That aligns our roof with the other side of the building.

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Let's hit escape a couple times.

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Now let's go to a 3D view.

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Our weird little roof is in place.

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Let's go ahead and attach our walls.

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I'm going to select one of my walls, I'm going to hit my tab key,

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and I'm going to select it, I'm going to click attach top base,

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I'm going to select my roof, and all my walls are going to go up to my roof level.

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Pretty easy, pretty straightforward.

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I can think of many,

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many situations of commercial structures where this is going to be necessary.

