Roof Modeling Help

[panastos]

I work in structure and don't model many roofs from scratch, I was wondering if someone could give me an assist as to the best way to model a roof with geometry like this:

I tried using the slope arrows but Revit is not having it. I don't know if I am putting them in the correct location, it is putting a valley in the middle of the roof, or failing to make the roof entirely.

Thank you!

[jay_colc]

This is a tricky one could you set one edge edge to define the 3 degree slope and a slope arrow along the other edge at the bottom.

I have found a previous thread on this forum which has several solutions and should help you along.

https://forums.autodesk.com/t5/revit-architecture-forum/roof-that-slopes-in-2-directions/td-p/678982...

[panastos]

I habe played with it and played with it and it doesn't seem like Revit will allow it. It is a big issue, I could manually determine the points to set it, but then I can't use it as a work plane which is really necessary. This is one piece of a similarly formed roof.

Is there any way I could model somethimg in place and then rotate it into position?

[ToanDN · Accepted solution]

You can model a rectangle mass with 3 degree slope in 2 directions.  Create a roof by face then use a vertical opening to cut it to shape.

[panastos]

Thanks I will give this method a try

[wisedrawing]

Can you show a sketch of what you want it to look like after? sort of some idea of the concept

As the placement of the geometry for Revit to 'built it' itself from a pitch input vs how you want it to look - wall heights close to the roof etc. where you are wanting to control the geometry is quite different. obviously Revit is trying to ensure that the ridge meets with the roof pitch and variability of the slope and that will vary a lot as its just trying to marry up the finished products from the 2 pitching points, but it depends how you want it to finish?

[panastos]

@ToanDN is there a reason you deleted your original idea? Model a square with a slope of 3 * sq rt of 2, rotate into position, and cut out my shape. Seems like a simpler solution.

[ToanDN]

It may work.  But the slope formula should be 3 / sqrt (2).

[panastos]

3 * sqrt (2) works to get the 3 degree slope at 45 degrees, I tried it. This is a slope of 4.24. Dividing by sq rt (2) gives you 2.12, which is not going to get you 3 degrees in any case. 

What formula is this?

The mass method seems to work as well.

[ToanDN · Accepted solution]

Yes 3 * sqrt (2) slope is correct.  I screwed up in my last response.  However, this approach only works if the slopes in both directions are the same, which is what you have.  The mass approach works more universally.