Sloped butterfly roof

[ellie7XSRV]

I am fairly new to revit and was wondering the best way to model a the roof of a current project.  The roof is flat on the top and slopes towards the building on the bottom. So the profile of the roof looks like a butterfly roof but it then slopes back towards the building.  I will add pictures as to what its supposed to look like.  The roof also has an odd shape around the building (shown in the pictures - it is orientated correctly with north towards the top of the picture).  

[bin]

Can you post a plan view with the roof pitch directions as well as gutter and down pipe locations?

[joe_keogh]

Hi @ellie7XSRV 

What does the Crosshatch in the elevations represent?

It would seem to me that the elevation does not show the roof at all, and you are only seeing the fascia around the roof.  This could be simply modeled as walls, and then Edit Profile to create the slope to the underside.

The roof itself sits behind the Fascia and can slope in any direction, whether to a box gutter in the middle, or concealed eaves gutters to the perimeter.

[barthbradley]

I'm with @joe_keogh

Do you have anything more than just this elevation?  Roof Plan, Cross-Sections, etc.? 

[ellie7XSRV]

The cross hatch has to do with the walls - not important to this so that can be ignored.  It is definitely the roof not a fascia.  I am attaching all the drawings I have (these are not ours but from the core and shell architects - we do not have access to their model). and a diagram of the direction of slopes with some dimensions.  

[ellie7XSRV]

I don't have the gutter and downspout locations

[ellie7XSRV]

I posted everything I have below (these are from the core and shell architects - I don't have access to their model)

[barthbradley]

Well, good news. It ain't a butterfly...

[ellie7XSRV]

No, it's not a butterfly, I wasn't sure what to call that thing on the bottom and butterfly was the closest thing that came to mind

[barthbradley]

Yep, and the bad news is I can't readily figure it out.  Is this all you have?  

[ellie7XSRV]

That is everything I have.  It doesn't have to be totally accurate or structurally accurate.  I just need something to show that it is there.

[bin]

Yes you have, it’s in the roof plan, and it looks like a simple sloped roof with slopes soffit.  

[ellie7XSRV]

I still need a way to try and model it, which I can't figure out

[barthbradley]

I think what's happening is that the soffit is sloped. That is the depth is being gradually reduced towards the center. 

[ellie7XSRV]

That's kinda what I have in my model now.  I have a simple roof and was going to try and model the soffit separately but I don't know how to do that

[barthbradley]

You can find the underside slope based on the thicknesses of the soffits in D1 and D4. D1 thickness minus D4 thickness divided by the distance between Section Marks D1 and D4.  

[bin]

Either model them separately, or use model in place, or modify points elevation. 

[barthbradley]

My thinking (and I'm just thinking aloud) is along the lines of modeling the soffit as a variable thickness floor and then cutting the front slope (yes, you have another slope to consider) from the edge of the floor using an with an In-Place Void.    Confused yet?  Join the club. 

This is kind of what I'm thinking aloud about:

[joe_keogh]

I stand by my original post, and from the PDF you have shared I think this is clear.

of course there is a soffit to the fascia, simply refer to the Detail wall sections.  

[barthbradley]

I'm standing right along side of you @joe_keogh. Now, how to model the d*mn thing.  Any thoughts?