Issue with roof angle modeling incorrectly

[ejowalter]

I am modeling an existing house, but I am running into an issue with the roof not wanting to sit on the top plate properly in one area.

I double checked the slope and they match, but for some reason the left side wants to side too high.

Any thoughts on what might be going on here?

[kjskoog]

Appears you want that section of the home to have a higher base level then the rest.  I also see you have different eave heights from one side of your bump out to the other. Verify the base level and base offset from level of all your roof edges in question.

Kory Skoog

BIM Manager

[constantin.stroescu]

it could be Plate Offset from Base as already mention in the previous post, or:

• could also be a result of how you've defined the Offset when in Edit Footprint: the result is different if you use : Pick Lines or you use Pick Walls. So check if you have both settings or , if you used Pick Walls they have different eave depth..

[barthbradley]

[ejowalter]

It looks like it possibly has something to do with the overhang on the left side. The plate offset would get it close, but I am not quite sure why it is doing it to begin with 🤔

[cbcarch]

It looks like the roof is not centered at the midpoint between the (2) exterior walls?

So, if both sides are the same slope, the two walls are the same exact height, and the roof is not centered (symmetrical) then what you have shown is expected behavior.

You say it's an existing house. Have you measured all of the elements in the field?

Am I missing something?

[ejowalter]

Yes, the actual footprint of the house is accurate.

I am not 100% sure, but I think somehow the fireplace is causing a conflict with the roof overhang in that section. If I put 2' 2" overhang on that section it has issues, that is probably why the angle of the roof is off on that side.

Is there any way I can prevent the chimney from conflicting?

[barthbradley · Accepted solution]

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@ejowalter wrote:

Is there any way I can prevent the chimney from conflicting?

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The chimney is not "conflicting".  

Is it an "Offset" Parameter or an "Overhang" Parameter?  Two different behaviors.  

I think what you did was use the "Pick Walls" method on only one side. "Overhang" means Pick Walls was used.  

[leipert23]

If you model the roof as if the chimney is not there, and then do a vertical cut through the roof that should solve any issues you have with the chimney throwing off your roof's geometry.  Here is the video explaining how to make a chimney, make the cut outs, and at the end of the video it covers how to make all the cut outs dynamic, so if you modify the chimney the floors, roof, and walls update alongside it.  Hope that helps make some lives easier!