Slope Roof Ridge

[rob.127056]

Anyone know how to create this roof?

[Gadget Man]

The first thing that comes to mind is to create roof by extrusion in a section view that is slanted to the required ridge slope in a side elevation view (create it in the side elevation view and slant the section line perpendicularly to the ridge line).

Create roof (start and end point of the extrusion) longer than needed and use voids/roof openings to cut off the unneeded parts...

PS. Sorry, that doesn't work for a straight roof by extrusion... Pity.
However, the next option I would try would be to create an in-place family of type Roofs using the above mentioned method...

Alternatively, I would create a mass with the sloping faces and then create a Roof By Face but this method is even more involved then the previous one...

[Alfredo Medina]

One possible solution is this:

New > conceptual mass > create some reference planes as guides, create reference points in plan view, level 2, as shown. Connect all these points with reference lines. From a front view, move the middle points up. From a side view, move the front lower points up, create a reference plane to define the slope, and move the top middle point forward, along the sloped reference plane. When you have all the set of points and lines for one face of the roof ready, make another level and copy paste all the points and lines to that new level, to create the thickness. Then select everything and > Create form. Since the roof is asymmetric, create a void, and use Cut Geometry to subtract the void from the form. Load into project > Roof by Face.

See illustration.

[DoTheBIM]

It's much easier if you just use a roof by footprint and slope arrows that aren't perpendicular to the eaves.

[rob.127056]

I have tried to use slope arrows with no luck. I would be interested in seeing how you would make this work with slope arrows?

[DoTheBIM]

See vid.

http://screencast.com/t/NjlmNDFiZDQt

[Alfredo Medina]

Interesting. But how do you set the slopes of the roof and the slope of the ridge at the same time to certain values with just the slope arrows? What is the logic?

[DoTheBIM]

Interesting. But how do you set the slopes of the roof and the slope of the ridge at the same time to certain values with just the slope arrows? What is the logic?
If I understand your question, your basing it on your previous example. Using this method, the Roof ridge slope is a product of the slope arrows pitch and angle placed in the sketch... No need to set the ridge slope independently. If you would(could though point edit methods) set it independently, you will have curved roof slopes (non-planer).

If your looking to do something precise with this method you would have to do a bit of math/trig to get the angles of the slope arrows just right. With the point edit methods it would be less involved in math, but more to maintain if something would change... I'm guessing... as I don't have a need to create roofs like these yet... so I don't get a lot of exposure to those types of methods.

[Alfredo Medina]

If your looking to do something precise with this method you would have to do a bit of math/trig to get the angles of the slope arrows just right.

It seems that for any change of slope I would have to do mathematical calculations in order to get all the slopes correctly (the two sides and the ridge) since all of them depend on the orientation, length and angle of the slope arrows.

[DoTheBIM]

It seems that for any change of slope I would have to do mathematical calculations in order to get all the slopes correctly (the two sides and the ridge) since all of them depend on the orientation, length and angle of the slope arrows.Sorry, didn't mean to imply that. With the slope arrow method you would have to do trig in any change slope situations to get it just right. With points it just might be a matter of some simple slope calculations for one of the points and then factoring the difference of that move into the other points. Really depends on the goal and what information is available prior to the change.